- Nano Idea
- Open Access
Fabrication of Semiconducting Methylammonium Lead Halide Perovskite Particles by Spray Technology
Nanoscale Research Letters volume 13, Article number: 6 (2018)
In this “nano idea” paper, three concepts for the preparation of methylammonium lead halide perovskite particles are proposed, discussed, and tested. The first idea is based on the wet chemistry preparation of the perovskite particles, through the addition of the perovskite precursor solution to an anti-solvent to facilitate the precipitation of the perovskite particles in the solution. The second idea is based on the milling of a blend of the perovskite precursors in the dry form, in order to allow for the conversion of the precursors to the perovskite particles. The third idea is based on the atomization of the perovskite solution by a spray nozzle, introducing the spray droplets into a hot wall reactor, so as to prepare perovskite particles, using the droplet-to-particle spray approach (spray pyrolysis). Preliminary results show that the spray technology is the most successful method for the preparation of impurity-free perovskite particles and perovskite paste to deposit perovskite thin films. As a proof of concept, a perovskite solar cell with the paste prepared by the sprayed perovskite powder was successfully fabricated.
Various forms of the organometal halide perovskites utilizing various cations, such as methylammonium (MA), formamidinium (FA), cesium (Cs), or a combination of thereof, are very attractive photovoltaic materials and are currently widely explored to develop conventional thin-film perovskite solar cells, e.g., [1,2,3,4], as well as flexible and low weight to power  and tandem perovskite-based solar cells . MA and FA cations are organic, less stable, and cheaper than Cs, which is a rare metal. While the majority of the research activities on the perovskites focus on thin-film solar cells, such molecular semiconductors could play a role in other similar fields, such as field effect transistors , perovskite light-emitting diodes , and high-energy radioactive radiation sensors .
In most perovskite-based devices, the perovskites are directly deposited in the form of thin films. However, several recent works have reported the fabrication of the perovskite semiconductors in the nanocrystal or particulate form. Perovskite nanocrystals exhibit high photoluminescence quantum yields and quantum confinement effects, analogous to the conventional quantum dots, when their dimensions are reduced to sizes comparable to their respective exciton Bohr radii, bringing about new opportunities for the development of new devices [10,11,12]. Most of such studies are centered around all-inorganic Cs-based perovskites, owing to their higher stability, e.g., [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30], followed by organic-inorganic MA-based perovskites, e.g., [31,32,33,34,35,36,37,38,39,40,41], and very few on the FA-based perovskites, e.g., . Most of the abovementioned works have focused on the properties of the perovskite nanocrystals. Some works have fabricated perovskite devices such as perovskite light-emitting diodes that incorporate the nanocrystals in the form of thin films, e.g., [21, 27, 29]. Few works have proposed formulations to prepare perovskite inks such as inks containing lead halide nanocrystals mixed with MA precursors  for the deposition of the thin films for solar cell applications.
The perovskite nanocrystals with rather small sizes and controlled morphology, as reported by the abovementioned works, are commonly grown in the solution (wet chemistry) . Schmidt et al.  prepared colloidal MAPbBr3 nanocrystals with the size of 6 nm by mixing the perovskite precursors with organic solvents. They also prepared homogeneous thin films of these nanoparticles by spin-coating. Hassan et al.  used a two-step solution method to prepare mixed MA-based perovskite nanodots, where first the lead halide seed particles form in the solution and then the MA solution is added in order to complete the process. All-inorganic Cs-based perovskite nanoparticles have been prepared using similar wet chemistry methods, such as injection of Cs precursors into the lead halide precursor solution containing hot, high boiling point solvents . Most of the aforementioned works focus on the fabrication of perovskite nanocrystals, which show a quantum confinement effect. However, for most thin-film devices such as solar cells, the quantum confinement effect is immaterial, and the preparation of polycrystalline micro- and nano-perovskite particles and thin films with facile techniques is desirable.
Presentation of the Hypothesis
In this work, we report the idea and successful preparation of MAPbI3 perovskite particles by low-cost and facile spray technology, for the first time. In this proposed method, following the well-known process of droplet-to-particle formation of pharmaceuticals and ceramics by spray drying and spray pyrolysis, e.g., [43,44,45,46], a spray nozzle atomizes the perovskite solution, where the droplets in the form of a mist are introduced into a single- or multi-stage hot wall (tubular) reactor. As the droplets travel along the reactor, the solvent evaporates, a chemical conversion occurs to convert the precursor droplets into the perovskite particles. Therefore, as a result of the presence of a chemical reaction, the process may be called spray pyrolysis. The produced perovskite particles are collected at the outlet of the reactor. The method is capable of producing small particles in the nanometer range, i.e., nanocrystals, if the solution is atomized using specialty atomization techniques, such as electrospray nozzles or low-concentration solutions . In addition, the fragile as-prepared perovskite particles may break down to form nano-sized perovskite particles, to be elaborated on later in this paper.
In addition to the spray route, two other methods are proposed and tested for the preparation of the perovskite particles, i.e., the wet chemistry and milling. In the wet chemistry method, the perovskite precursor solution is added dropwise to an anti-solvent of the perovskite solvents, such as toluene, under stirring condition. The method leads to the precipitation of the perovskite particles in the anti-solvent. In the milling method, the perovskite precursors such as dry MAI and PbI2 powders are blended and milled, for instance in a hot plate magnetic stirrer, for several hours to react with one another, due to the mechanical forces. Figure 1 shows the schematic of the three proposed methods used in this work to prepare the perovskite particles.
Testing the Hypotheses
In order to test the credibility of the proposed ideas, we have conducted preliminary experiments by preparing perovskite powders, as well as thin films and solar cells with the produced powders. Perovskite precursors were purchased from Xi’an Reagents Co., China, and other chemical were purchased from Sigma-Aldrich. The perovskite liquid solution used in the anti-solvent and spray methods were prepared by dissolving 158 mg of MAI and 420 mg of PbI2 powders in 1 ml of dimethyl sulfoxide (DMSO).
In the anti-solvent method, the perovskite solution was added to toluene dropwise under stirring condition. After 2 min, yellow perovskite powder precipitated at the bottom and sidewalls of the beaker, and after 20 min of stirring, colloidal perovskite powder was observed in toluene, as well. This product (after 20 min) was annealed in an oven at 150 °C for 60 min. Figure 2a shows the X-ray diffraction (XRD; model D5005, Bruker, Germany) of the perovskite powder prepared by an anti-solvent method, where it is evident that the precursors have converted to the perovskite, although some weak peaks, associated with impurities are present.
Testing the idea of blending and milling of the dry perovskite precursors for the preparation of the perovskite powder requires a well-designed milling machine to provide sufficient forces. Here, in order to test the idea, a simple hot plate magnetic stirrer was used. The MAI and PbI2 powders were mixed with the mass ratios of PbI2/MAI of 1 and 2. The hot plate was kept at 200 °C, and the dry powders were blended and crushed in the container due to the force of the magnetic stirring bar. In wet chemistry preparation of perovskite precursor solution, the mass ratio of PbI2/MAI is around 3 (as mentioned above for the preparation of the perovskite solution), whereas in the milling method, we found that lower mass ratios (less PbI2 than stoichiometric) is more effective, in that the reaction of the precursor powders and conversion to the perovskite is improved. Figure 2b shows the XRD patterns of the produced perovskite powder for the PbI2/MAI mass ratios of 1.0 and 2.0. In general, the mass ratio of 1.0 is more successful in producing the perovskite powders; however, traces of impurities are present. This may be due to the insufficient interacting forces between the two precursors that results in traces of the initial precursors mixed up with the perovskite powder. Therefore, the milling approach was not successful in producing pure perovskite structure. Using a well-designed milling machine and careful control of the process parameters, such as the milling time and temperature, and addition of small amount of proper solvents to facilitate the process may improve the purity and the crystalline structure of the powders.
In the spray method, the perovskite solution was atomized with an air-assisted spray nozzle with a nozzle diameter of 0.2 mm, where the air pressure was set to 2.0 psig. The spray droplets were introduced into two vertically stacked stainless steel tubular heaters with a diameter of 10 cm, a length of 30 cm, with the maximum power of 800 W, each (Yancheng Huabang Electric Equipment Co., Ltd). The first heater was kept at 275 °C, so as to quickly evaporate the solvent, and the second or bottom heater was kept at either 275 °C or a lower temperature of 175 °C, where the latter was used to avoid the decomposition of the perovskite powders that had already formed. As Fig. 2c shows, the powder produced when the temperature of both heaters is kept at 275 °C contains high intensity peaks of PbI2, whereas when the temperature of the second heater is reduced to 175 °C, the impurities are nearly disappeared and the crystallinity of the perovskite is increased. In summary, the XRD results of the powders produced using the three abovementioned methods (Fig. 2) substantiate the merit of the spray method for producing pure and crystalline perovskite powders.
Figure 3 shows the scanning electron microscope (SEM; Hitachi, Model S-3400N) images of the produced powders by the three aforementioned methods. It is observed that the collected powders are somewhat agglomerated, which may have happened during the preparation or analysis. Nevertheless, the images of the powders prepared by the milling and spraying show the shape and size of the individual particles. The particles are few microns in size and have non-spherical and irregular shapes. In the spray method, one may expect to see spherical particles, as each perovskite droplet usually dries to form a perovskite particle. The non-spherical shape may be due to the strong ionic forces within the droplets of perovskite and/or preferential growth of perovskite structure along a particular axis , which might have caused distortion of the drying particles. In other words, while the surface tension on the droplet surface tends to retain the spherical shape, the developed ionic forces in the particle during the precipitation could outweigh the surface tension force. This phenomenon is encountered in drying of other ionic solution droplets, such as NaCl, e.g., . In addition, partial break down of the as-prepared perovskite particles may be responsible for the small sizes and irregular shapes of the perovskite particles.
To further study the particle size, we dispersed the aforementioned powders in toluene and measured the particle size by a zeta particle sizer (Malvern, nano-zs90). Figure 4 shows the particle size distribution of the powders produced by the three aforementioned methods. Dispersion of the powders in toluene results in disintegration and breakdown of the particles, such that the individual particles have a size near or below 1 μm. This indicates that the produced particles have a weak and fragile structure and easily break down to smaller nano-sized particles. Such phenomenon has been observed by others in other particle systems, [49, 50] as well. The results also show a narrow size distribution for the particles prepared by the spray method. Based on the SEM and particle size measurements, the spray method for the preparation of the perovskite particles has been schematically shown in Fig. 5. The milling process also produces small particles, but with a wider size distribution. The powder made by the anti-solvent method has the largest particle size. Thus, the spray method produces small and mono-dispersed particles compared to the other two methods, making it a suitable method for the preparation of a perovskite paste for the deposition of thin films. The XRD patterns had already shown that the most pure and crystalline perovskite powder is obtained by the spray method as well.
Implication of the Hypothesis
We further examined the possibility of using the produced powders to prepare perovskite films. Fluorine-doped indium tin oxide (FTO)-coated glass substrates, washed with detergent, water, and isopropanol and treated with the UV radiation, was used as the starting substrate. Then, layers of compact TiO2 (c-TiO2) and m-TiO2 were deposited atop the FTO-coated glass, sequentially. For the c-TiO2 layer, 2.54 ml of titanium isopropoxide was diluted in 16.9 ml of ethanol, and 350 μl of HCl (2 M) was diluted in 16.9 ml of ethanol. The HCl solution was added to the titanium isopropoxide solution dropwise, under stirring condition, and the resulting solution was spun onto the FTO-coated glass at 2000 rpm for 60 s and annealed at 500 °C for 30 min. In order to fabricate the m-TiO2 layer, titanium dioxide paste diluted by ethanol (2:7 mass ratio) was spun on the c-TiO2 layer at 5000 rpm for 30 s and annealed at 500 °C for 30 min. Then, the perovskite paste was prepared by adding 10 μl of ethanol to 20 mg of the produced powders. The paste was deposited on the m-TiO2 layer at room temperature at a speed of 3 mm/s with a blade coater. The SEM images of the perovskite films are shown in Fig. 6, where it is observed that only the film deposited by the paste prepared by the spray-generated powder is uniform and fully-covered. This is partly due to the small particle size and a narrow size distribution associated with the aforementioned particles, as shown in Fig. 4. The UV-Vis absorbance (Lambda 20, Perkin Elmer Inc., USA) of the aforementioned perovskite thin films are shown in Fig. 7, where it is substantiated that the perovskite film prepared with the spray-generated perovskite powder shows a standard absorbance profile, with a sudden drop in the absorbance around the wavelength of 750 nm, which is the characteristic of the perovskites .
In order to further test the proposed idea, a basic perovskite solar cell was fabricated, incorporating the MAPbI3 perovskite film prepared with the spray-made particles. To this end, spiro-OMeTAD was deposited atop the perovskite film, based on the procedure explained elsewhere , and then 100 nm of Au was thermally evaporated to complete the device. The JV curve and the photovoltaic parameters of the fabricated device are shown in Fig. 8. The power conversion efficiency (2.05%) is low due to low open circuit voltage (Voc), short circuit current density (Jsc), and fill factor (FF). This may be mainly attributed to the insufficient binding between the perovskite particles in the film, which has presumably resulted in excessive charge recombination, due to an inadequate charge transfer from the perovskite to the adjacent layers (TiO2 and spiro-OMeTAD). Nevertheless, the successful fabrication of a perovskite solar cell shows the merit of the proposed method, i.e., the fabrication of the perovskite particles by spray coating. In this work, ethanol was used to prepare the paste and bind the particles. Using more suitable additives that do not dissolve the perovskites and at the same time play the role of an effective glue would improve the quality of the films and the device performance.
In this work, we introduced three ideas for the preparation of perovskite particles and perovskite pastes to produce thin films. It was demonstrated that the powder prepared by spraying of the perovskite solution is crystalline and impurity-free, and has a small particle size and size distribution. Perovskite pastes and thin films were prepared using the aforementioned perovskite powders, where the perovskite film prepared using the spraying technique showed a standard morphology and light absorbance. A mesoporous perovskite solar cell was fabricated using the perovskite film prepared by the sprayed particles, where an efficiency of 2.05% was measured.
Saliba M et al (2016) Cesium-containing triple cation perovskite solar cells: improved stability, reproducibility and high efficiency. Energy Environ Sci 9:1989–1997. https://doi.org/10.1039/C5EE03874J
Tong X et al (2016) High performance perovskite solar cells. Adv Sci 3:1500201. https://doi.org/10.1002/advs.201500201
Tang H et al (2017) A short progress report on high-efficiency perovskite solar cells. Nanoscale Res Lett 12:410. https://doi.org/10.1186/s11671-017-2187-5.
Habibi M et al (2016) Progress in emerging solution-processed thin film solar cells—part II: perovskite solar cells. Renew Sust Energ Rev 62:1012–1031. https://doi.org/10.1016/j.rser.2016.05.042
Wang Q, et al (2017) Effects of self-assembled monolayer modification of nickel oxide nanoparticles layer on the performance and application of inverted perovskite solar cells, ChemSusChem, 10:3794–3803. doi: https://doi.org/10.1002/cssc.201701262.
Hörantner MT, Snaith HJ (2017) Predicting and optimising the energy yield of perovskite-on-silicon tandem solar cells under real world conditions. Energy Environ Sci 10:1983–1993. https://doi.org/10.1039/C7EE01232B
Wu Y et al (2016) Organic–inorganic hybrid CH3NH3PbI3 perovskite materials as channels in thin-film field-effect transistors. RSC Adv 6:16243–16249. https://doi.org/10.1039/C5RA24154E
Chin XY et al (2015) Lead iodide perovskite light-emitting field-effect transistor. Nat Commun 6:7383. https://doi.org/10.1038/ncomms8383
Stoumpos CC et al (2013) Crystal growth of the perovskite semiconductor CsPbBr3: a new material for high-energy radiation detection. Cryst Growth Des 13:2722−2727. https://doi.org/10.1021/cg400645t
Polavarapu L, et al. (2017) Advances in quantum-confined perovskite nanocrystals for optoelectronics. Adv Energy Mater 7. DOI: https://doi.org/10.1002/aenm.201700267
Bai S et al (2016) Colloidal metal halide perovskite nanocrystals: synthesis, characterization, and applications. J Mater Chem C 4:3898–3904. https://doi.org/10.1039/C5TC04116C
Fu P et al (2017) Perovskite nanocrystals: synthesis, properties and applications. Sci Bull 62:369–380. https://doi.org/10.1016/j.scib.2017.01.006
Ramasamy P (2016) All-inorganic cesium lead halide perovskite nanocrystals for photodetector applications. Chem Commun 52:2067–2070. https://doi.org/10.1039/C5CC08643D
Hu F et al (2015) Superior optical properties of perovskite nanocrystals as single photon emitters. ACS Nano 9:12410–12416. https://doi.org/10.1021/acsnano.5b05769
Akkerman QA et al (2015) Tuning the optical properties of cesium lead halide perovskite nanocrystals by anion exchange reactions. Am Chem Soc 137:10276–10281. https://doi.org/10.1021/jacs.5b05602
Park YS et al (2015) Room temperature single-photon emission from individual perovskite quantum dots. ACS Nano 9:10386–10393. https://doi.org/10.1021/acsnano.5b04584
Swarnkar A et al (2015) Colloidal CsPbBr3 perovskite nanocrystals: luminescence beyond traditional quantum dots. Angew Chem 127:15644–15648. https://doi.org/10.1002/ange.201508276
Lignos I et al (2016) Synthesis of cesium lead halide perovskite nanocrystals in a droplet-based microfluidic platform: fast parametric space mapping. Nano Lett 16:1869–1877. https://doi.org/10.1021/acs.nanolett.5b04981
Wang Y (2016) Nonlinear absorption and low-threshold multiphoton pumped stimulated emission from all-inorganic perovskite nanocrystals. Nano Lett 16:448–453. https://doi.org/10.1021/acs.nanolett.5b04110.
Sun S et al (2016) Ligand-mediated synthesis of shape-controlled cesium lead halide perovskite nanocrystals via reprecipitation process at room temperature. ACS Nano 10:3648–3657. https://doi.org/10.1021/acsnano.5b08193
Yassitepe E et al (2016) Amine-free synthesis of cesium lead halide perovskite quantum dots for efficient light-emitting diodes. Adv Funct Mater 26:8757–8763. https://doi.org/10.1002/adfm.201604580
Wei S et al (2016) Room-temperature and gram-scale synthesis of CsPbX3 (X = Cl, Br, I) perovskite nanocrystals with 50–85% photoluminescence quantum yields. Chem Commun 52:7265–7268. https://doi.org/10.1039/C6CC01500J
Liu Z et al (2017) Ligand mediated transformation of cesium lead bromide perovskite nanocrystals to lead depleted Cs4PbBr6 nanocrystals. J Am Chem Soc 139:5309–5312. https://doi.org/10.1021/jacs.7b01409
Jellicoe TC et al (2016) Synthesis and optical properties of lead-free cesium tin halide perovskite nanocrystals. J Am Chem Soc 138:2941–2944. https://doi.org/10.1021/jacs.5b13470
Chen M et al (2017) Solvothermal synthesis of high-quality all-inorganic cesium lead halide perovskite nanocrystals: from nanocube to ultrathin nanowire. Adv Funct Mater 27:1701121. https://doi.org/10.1002/adfm.201701121
Yao E et al (2017) High-brightness blue and white LEDs based on inorganic perovskite nanocrystals and their composites. Adv Mater 29:1606859. https://doi.org/10.1002/adma.201606859
Kim YH et al (2017) Highly efficient light-emitting diodes of colloidal metal–halide perovskite nanocrystals beyond quantum size. ACS Nano 11:6586–6593. https://doi.org/10.1021/acsnano.6b07617
Hou S et al (2017) Synthesis and stabilization of colloidal perovskite nanocrystals by multidentate polymer micelles. ACS Appl Mater Interfaces 9:18417–18422. https://doi.org/10.1021/acsami.7b03445
Shi Z et al (2017) High-efficiency and air-stable perovskite quantum dots light-emitting diodes with an all-inorganic heterostructure. Nano Lett 17:313–321. https://doi.org/10.1021/acs.nanolett.6b04116
Protesescu L et al (2015) Nanocrystals of cesium lead halide perovskites (CsPbX3, X = Cl, Br, and I): novel optoelectronic materials showing bright emission with wide color gamut. Nano Lett 15:3692–3696. https://doi.org/10.1021/nl5048779
Schmidt LC et al (2014) Nontemplate synthesis of CH3NH3PbBr3 perovskite nanoparticles. J Am Chem Soc 136:850–853. https://doi.org/10.1021/ja4109209
Di D et al (2015) Size-dependent photon emission from organometal halide perovskite nanocrystals embedded in an organic matrix. J Phys Chem Lett 6:446–450. https://doi.org/10.1021/jz502615e
Zhu F et al (2015) Shape evolution and single particle luminescence of organometal halide perovskite nanocrystals. ACS Nano 9:2948–2959. https://doi.org/10.1021/nn507020s
Vybornyi O et al (2016) Polar-solvent-free colloidal synthesis of highly luminescent alkylammonium lead halide perovskite nanocrystals. Nano 8:6278–6283. https://doi.org/10.1039/C5NR06890H
Tian Y et al (2015) Giant photoluminescence blinking of perovskite nanocrystals reveals single-trap control of luminescence. Nano Lett 15:1603–1608. https://doi.org/10.1021/nl5041397
Hassan Y et al (2016) Structure-tuned lead halide perovskite nanocrystals. Adv Mater 28:566–573. https://doi.org/10.1002/adma.201503461
Wang L et al (2017) Scalable ligand-mediated transport synthesis of organic–inorganic hybrid perovskite nanocrystals with resolved electronic structure and ultrafast dynamics. ACS Nano 11:2689–2696. https://doi.org/10.1021/acsnano.6b07574
Luo B et al (2015) Synthesis, optical properties, and exciton dynamics of organolead bromide perovskite nanocrystals. J Phys Chem C 119:26672–26682. https://doi.org/10.1021/acs.jpcc.5b08537
Huang H et al (2017) Top-down fabrication of stable methylammonium lead halide perovskite nanocrystals by employing a mixture of ligands as coordinating solvents. Angew Chem 56:9571–9576. https://doi.org/10.1002/anie.201705595
Jang DM et al (2016) Ultrasound synthesis of lead halide perovskite nanocrystals. J Mater Chem C 4:10625–10629. https://doi.org/10.1039/C6TC04213A
Lamberti F et al (2017) High-quality, ligands-free, mixed-halide perovskite nanocrystals inks for optoelectronic applications. Adv Energy Mater 7:1601703. https://doi.org/10.1002/aenm.201601703
Minh DA et al (2017) Room-temperature synthesis of widely tunable formamidinium lead halide perovskite nanocrystals. Chem Mater 29:5713–5719. https://doi.org/10.1021/acs.chemmater.7b01705
Eslamian M, Ashgriz N (2011) Spray drying, spray pyrolysis and spray freeze drying. In: Ashgriz N (ed) Handbook of atomization and sprays. Springer, Boston, pp 849–860. https://doi.org/10.1007/978-1-4419-7264-4_37
Eslamian M, Ahmed M, Ashgriz N (2006) Modelling of nanoparticle formation during spray pyrolysis. Nanotechnology 17:1674
Eslamian M, Ahmed M, Ashgriz N (2009) Modeling of solution droplet evaporation and particle evolution in droplet-to-particle spray methods. Dry Technol 27:3–13
Eslamian M, Shekarriz M (2009) Recent advances in nanoparticle preparation by spray and microemulsion methods. Recent Pat Nanotechnol 3:99–115
Kim SY et al (2016) Preferential (100)-oriented CH3NH3PbI3 perovskite film formation by flash drying and elucidation of formation mechanism. RSC Adv 6:94502–94509. https://doi.org/10.1039/C6RA21423A
Eslamian M, Ashgriz N (2007) Evaporation and evolution of suspended solution droplets at atmospheric and reduced pressures. Dry Technol 25:1009–1020. https://doi.org/10.1080/07373930701394977
Okuyama K, Lenggoro IW (2003) Preparation of nanoparticles via spray route. Chem Eng Sci 58:537–547. https://doi.org/10.1016/S0009-2509(02)00578-X
Jakic N, Gregory J, Eslamian M, Ashgriz N (2009) Effect of impurities on characteristics of ZrO2 and ZnO ceramic powders produced by spray pyrolysis. J Mater Sci 44:1977–1986. https://doi.org/10.1007/s10853-009-3282-5
Ahmadian-Yazdi MR et al (2016) Effects of process parameters on the characteristics of mixed-halide perovskite solar cells fabricated by one-step and two-step sequential coating. Nanoscale Res Lett 11:408. https://doi.org/10.1186/s11671-016-1601-8.
The research funding by the Shanghai Municipal Educational Commission and by the National Natural Science Foundation of China (NSFC) are acknowledged. The funding was used to purchase equipment and materials, perform the experiments and analyses, and pay for the publication fees.
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
About this article
Cite this article
Ahmadian-Yazdi, M., Eslamian, M. Fabrication of Semiconducting Methylammonium Lead Halide Perovskite Particles by Spray Technology. Nanoscale Res Lett 13, 6 (2018) doi:10.1186/s11671-017-2430-0
- Perovskite solar cells
- Perovskite particles
- Perovskite nanocrystals
- Spray pyrolysis