CdS quantum dot-sensitized solar cells based on nano-branched TiO2 arrays
© Liu et al.; licensee Springer. 2014
Received: 24 December 2013
Accepted: 24 February 2014
Published: 4 March 2014
Nano-branched rutile TiO2 nanorod arrays were grown on F:SnO2 conductive glass (FTO) by a facile, two-step wet chemical synthesis process at low temperature. The length of the nanobranches was tailored by controlling the growth time, after which CdS quantum dots were deposited on the nano-branched TiO2 arrays using the successive ionic layer adsorption and reaction method to make a photoanode for quantum dot-sensitized solar cells (QDSCs). The photovoltaic properties of the CdS-sensitized nano-branched TiO2 solar cells were studied systematically. A short-circuit current intensity of approximately 7 mA/cm2 and a light-to-electricity conversion efficiency of 0.95% were recorded for cells based on optimized nano-branched TiO2 arrays, indicating an increase of 138% compared to those based on unbranched TiO2 nanorod arrays. The improved performance is attributed to a markedly enlarged surface area provided by the nanobranches and better electron conductivity in the one-dimensional, well-aligned TiO2 nanorod trunks.
KeywordsTiO2 CdS Nanobranch Solar cells
Solar cells have attracted considerable attention because of their potential application in low-cost and flexible energy generation devices. Since the seminal work pioneered by O'Regan and Grätzel in 1991, dye-sensitized solar cells have been investigated extensively all over the world [1–11]. Assembly of branched nanostructures also received intense scrutiny due to their potential effects to a number of promising applications such as solar cells, water splitting, optoelectronics, sensing, field emission, and more [12, 13]. In 2013, Roh et al. studied solar cells based on nano-branched TiO2 nanotubes, specifically, nanotubes characterized by increased surface area . The results were attractive; they were able to achieve an impressive light-to-electricity conversion rate. Also of note, Roh et al. used organic dye as a sensitizer to fabricate solar devices. However, the use of dye as a sensitizer is problematic for two reasons: first, organic dye is expensive; second, and perhaps more importantly, the organic dye proved to be unstable. As a result, using dye to sensitize solar cells is still not feasible for practical applications.
Because it is critical to tailor materials to be not only cost-effective but also long-lasting, inorganic semiconductors such as CdSe [15, 16], PbS [17–19], CdS , and Sb2S3[21, 22] have several advantages over conventional dyes: first, the band gap of semiconductor nanoparticles can be tuned by size to match the solar spectrum; second, their large intrinsic dipole moments can lead to rapid charge separation and a large extinction coefficient, which is known to reduce the dark current and increase the overall efficiency; third, and finally, semiconductor sensitizers provide new chances to utilize hot electrons to generate multiple charge carriers with a single photon. Hence, nano-sized, narrow band gap semiconductors are ideal candidates for the optimization of solar cells to achieve improved performance. To date, CdS-sensitized solar cells have been studied by many groups [23–26]. In most reported works, CdS quantum dots were grown on TiO2 nanotubes and TiO2 nanoporous photoanodes with hierarchical pore distribution. However, little work has been carried out on utilizing nano-branched TiO2 arrays as photoanodes. Compared to polycrystal TiO2 nanostructures, such as nanotubes and nanoparticles, nano-branched TiO2 nanorod arrays, which are grown directly on transparent conductive oxide electrodes, increase the photocurrent efficiency by avoiding the particle-to-particle hopping that occurs in polycrystalline films. These nanostructures could simultaneously offer a large surface area for deposition of CdS quantum dots, excellent light-trapping characteristics, lower charge carrier recombination rates, and a highly conductive pathway for charge carrier collection, resulting in a highly efficient photoanode for solar cell applications.
In this study, a facile, two-step wet chemical synthesis process at low temperature was applied to vertically grown TiO2 nano-branched arrays on F:SnO2 conductive glass (FTO). By varying the growth time, the length of nanobranches was optimized to provide a larger area for deposition of CdS quantum dots. Using the successive ionic layer adsorption and reaction (SILAR) method, CdS quantum dots were deposited on the surface of TiO2 nano-branched arrays to make a photoanode for quantum dot solar cells. The efficiency of the solar cells varied as the growth time of TiO2 nanobranches changed. A light-to-electricity conversion efficiency of 0.95% was recorded for solar cells based on an optimized nano-branched array, indicating an increase of 138% compared to that of solar cells based on unbranched arrays.
Growth of single-crystalline rutile TiO2 nano-branched arrays by facile, two-step wet chemical synthesis process
The TiO2 nanorod arrays were obtained using the following hydrothermal methods: 50 mL of deionized water was mixed with 40 mL of concentrated hydrochloric acid. After stirring at ambient temperature for 5 min, 400 μL of titanium tetrachloride was added to the mixture. The feedstock prepared above was injected into a stainless steel autoclave with a Teflon lining. The FTO substrates were ultrasonically cleaned for 10 min in a mixed solution of deionized water, acetone, and 2-propanol with volume ratios of 1:1:1 and were placed at an angle against the Teflon liner wall with the conducting side facing down. The hydrothermal synthesis was performed by placing the autoclave in an oven and keeping it at 180°C for 2 h. After synthesis, the autoclave was cooled to room temperature under flowing water, and the FTO substrates were taken out, washed extensively with deionized water, and dried in the open air.
The TiO2 nanobranches were grown by immersing the TiO2 nanorod arrays prepared above in a bottle filled with an aqueous solution of 0.2 M TiCl4. The bottle was sealed and kept at a constant temperature of 25°C for 6 to 24 h. Finally, the TiO2 nano-branched arrays on FTO were rinsed with ethanol and air-dried at 50°C. After synthesis, the nano-branched arrays were annealed under 450°C for 30 min.
Deposition of CdS quantum dots using successive ionic layer adsorption and reaction method
In a typical SILAR deposition cycle, Cd2+ ions were deposited from a 0.05 M Cd(NO3)2 ethanol solution; the sulfide source was 0.05 M Na2S in methanol/water (1:1, v/v). The conductive FTO glass, pre-grown with TiO2 nano-branched arrays, was dipped into the Cd(NO3)2 ethanol solution for 2 min, then dipped into a Na2S solution for another 5 min. This entire SILAR process was repeated to obtain the optimal thickness of CdS quantum dots.
A field emission scanning electron microscope (FESEM; Hitachi S-4800, Hitachi, Ltd., Chiyoda, Tokyo, Japan) was used to characterize the morphology of the samples. The crystal structure of the TiO2 nano-branched arrays was examined by X-ray diffraction (XRD; XD-3, PG Instruments Ltd., Beijing, China) with Cu Kα radiation (λ = 0.154 nm) at a scan rate of 4° per min. X-ray tube voltage and current were set to 36 kV and 20 mA, respectively. The optical absorption spectrum was obtained using a UV-visible spectrometer (TU-1900, PG Instruments, Ltd., Beijing, China).
Solar cell assembly and performance measurement
Solar cells were assembled using nano-branched TiO2/CdS nanostructures as photoanodes. Pt counter electrodes were prepared by depositing a 20-nm-thick Pt film on FTO glass using magnetron sputtering. A 60-μm-thick sealing material (SX-1170-60, Solaronix SA, Aubonne, Switzerland) with a 5 × 5 mm2 aperture was pasted onto the Pt counter electrodes. The Pt counter electrode and the nano-branched TiO2/CdS photoelectrode were sandwiched and sealed with the conductive sides facing inward. A polysulfide electrolyte was injected into the space between the two electrodes. The polysulfide electrolyte was composed of 0.5 M sulfur, 1 M Na2S, and 0.1 M NaOH, all of which were dissolved in methanol/water (7:3, v/v) and stirred at 80°C for 2 h.
A solar simulator (Model 94022A, Newport, OH, USA) with an AM1.5 filter was used to illuminate the working solar cell at a light intensity of 1 sun illumination (100 mW/cm2). A sourcemeter (2400, Keithley Instruments Inc., Cleveland, OH, USA) provided electrical characterization during the measurements. Measurements were calibrated using an OSI standard silicon solar photodiode.
Results and discussion
J sc , V oc , FF, and efficiency
TiO2 NB (6)/CdS
TiO2 NB (12)/CdS
TiO2 NB (18)/CdS
TiO2 NB (24)/CdS
From the above results, it is clear that solar cells based on the TiO2 nano-branched arrays show an improved photovoltaic performance. This significant improvement can be attributed to the following: (1) the specific surface area and roughness factor of TiO2 nano-branched arrays were markedly enlarged, leading to expanded areas for the deposition of CdS quantum dots; (2) the photo-generated electrons transport quickly from the TiO2 nanobranches through the single-crystalline TiO2 nanorods to the FTO substrates, facilitated by the increased electron conductivity of TiO2 nanorods; and (3) these nanobranches can fill the gaps between nanorods, which may improve their ability to harvest light, and thereby improve power conversion efficiency.
In our present work, the power conversion efficiency of our solar cells remains too low for use in practical applications. The rather poor fill factor is considered to be the main factor limiting the energy conversion efficiency. This low fill factor may be ascribed to the lower hole recovery rate of the polysulfide electrolyte, which leads to a higher probability for charge recombination. To improve the efficiency of these CdS/TiO2 nano-branched quantum dot-sensitized solar cells, a new hole transport medium must be developed, one with suitable redox potential and low electron recombination at the semiconductor-electrolyte interface.
Counter electrodes have also been reported to be another important factor influencing the energy conversion efficiency. Recently, a number of novel materials have been examined and tested as counter electrode materials; these studies prove the influence of various counter electrode materials on the fill factors of solar devices [27–29]. In addition, graphene with outstanding, transparent conducting properties has been explored as an efficient constituent for solar cell applications [30–32]. Further studies will be conducted to optimize the nanostructures and counter electrode materials to improve the performance of our solar cells.
In this study, large-area nano-branched TiO2 nanorod arrays were grown on fluorine-doped tin oxide glass by a low-cost two-step hydrothermal method. The resultant nanostructures consisted of single-crystalline nanorod trunks and a large number of short TiO2 nanobranches, which is an effective structure for the deposition of CdS quantum dots. CdS quantum dots were deposited on the nano-branched TiO2 nanorod arrays by a successive ionic layer adsorption and reaction method to form an effective photoanode for quantum dot-sensitized solar cells. As the length of nanobranches increased, the conversion efficiency varied respectively. An optimal efficiency of 0.95% was recorded in solar cells based on TiO2 nanorod arrays with optimized nanobranches, indicating an increase of 138% compared to those based on bare TiO2 nanorod arrays. In this aspect, the nano-branched TiO2 arrays on FTO turned out to be more desirable than bare nanorod arrays for the applications of quantum dot-sensitized solar cells. Further studies of both quantum dot-sensitized solar cells and dye-sensitized solar cells based on these hierarchical TiO2 nanostructures grown directly on the FTO conductive glass would be promising and significant for solar cell applications.
This work was supported by the National Key Basic Research Program of China (2013CB922303, 2010CB833103), the National Natural Science Foundation of China (60976073, 11274201, 51231007), the 111 Project (B13029), and the National Fund for Fostering Talents of Basic Science (J1103212).
- O'Regan B, Grätzel M: A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films. Nature 1991, 335: 737.View Article
- Yin X, Xue ZS, Liu B: Electrophoretic deposition of Pt nanoparticles on plastic substrates as counter electrode for flexible dye-sensitized solar cells. J Power Sources 2011, 196: 2422. 10.1016/j.jpowsour.2010.09.047View Article
- Song HK, Yoon JS, Won J, Kim H, Yeom MS: New approach to the reduction of recombination in dye-sensitised solar cells via complexation of oxidised species. J Nanosci Nanotechnol 2013, 13: 5136. 10.1166/jnn.2013.7509View Article
- Guo WX, Xu C, Wang X, Wang SH, Pan CF, Lin CJ, Wang ZL: Rectangular bunched rutile TiO2 nanorod arrays grown on carbon fiber for dye-sensitized solar cells. J Am Chem Soc 2012, 134: 4437. 10.1021/ja2120585View Article
- Sun XM, Sun Q, Li Y, Sui LN, Dong LF: Effects of calcination treatment on the morphology and crystallinity, and photoelectric properties of all-solid-state dye-sensitized solar cells assembled by TiO2 nanorod arrays. Phys Chem Chem Phys 2013, 15: 18716. 10.1039/c3cp51941dView Article
- Kong J, Zhou ZJ, Li M, Zhou WH, Yuan SJ, Yao RY, Zhao Y, Wu SX: Wurtzite copper-zinc-tin sulfide as a superior counter electrode material for dye-sensitized solar cells. Nanoscale Res Lett 2013, 8: 464. 10.1186/1556-276X-8-464View Article
- Grätzel M: Solar energy conversion by dye-sensitized photovoltaic cells. Inorg Chem 2005, 44: 6841. 10.1021/ic0508371View Article
- Fan X, Chu ZZ, Wang FZ, Zhang C, Chen L, Chen Y, Tang YW, Zou DC: Wire-shaped flexible dye-sensitized solar cells. Adv Mater 2008, 20: 592. 10.1002/adma.200701249View Article
- Lee MR, Eckert RD, Forberich K, Dennler G, Brabec CJ, Gaudiana RA: Solar power wires based on organic photovoltaic materials. Science 2009, 324: 232. 10.1126/science.1168539View Article
- Tsai JK, Hsu WD, Wu TC, Meen TH, Chong WJ: Effect of compressed TiO2 nanoparticle thin film thickness on the performance of dye-sensitized solar cells. Nanoscale Res Lett 2013, 8: 459. 10.1186/1556-276X-8-459View Article
- Wang D, Hou SC, Wu HW, Zhang C, Chu ZZ, Zou DC: Fiber-shaped all-solid state dye sensitized solar cell with remarkably enhanced performance via substrate surface engineering and TiO2 film modification. J Mater Chem 2011, 21: 6383. 10.1039/c1jm00016kView Article
- Zhang QF, Cao GZ: Nanostructured photoelectrodes for dye-sensitized solar cells. Nano Today 2011, 6: 91. 10.1016/j.nantod.2010.12.007View Article
- Wang ZL: ZnO nanowire and nanobelt platform for nanotechnology. Mater Sci Eng R 2009, 64: 33. 10.1016/j.mser.2009.02.001View Article
- Roh DK, Chi WS, Jeon H, Kim SJ, Kim JH: High efficiency solid-state dye-sensitized solar cells assembled with hierarchical anatase pine tree-like TiO2 nanotubes. Adv Funct Mater 2013. doi:10.1002/adfm.201301562 doi:10.1002/adfm.201301562
- Chen YX, Wei L, Zhang GH, Jiao J: Open structure ZnO/CdSe core/shell nanoneedle arrays for solar cells. Nanoscale Res Lett 2012, 7: 516. 10.1186/1556-276X-7-516View Article
- Choi H, Kuno M, Hartlanda GV, Kamat PV: CdSe nanowire solar cells using carbazole as a surface modifier. J Mater Chem A 2013, 1: 5487. 10.1039/c3ta10387kView Article
- Chang LY, Lunt RR, Brown PR, Bulović V, Bawendi MG: Low-temperature solution-processed solar cells based on PbS colloidal quantum dot/CdS heterojunctions. Nano Lett 2013, 13: 994. 10.1021/nl3041417View Article
- Li YT, Wei L, Chen XY, Zhang RZ, Sui X, Chen YX, Jiao J, Mei LM: Efficient PbS/CdS co-sensitized solar cells based on TiO2 nanorod arrays. Nanoscale Res Lett 2013, 8: 67. 10.1186/1556-276X-8-67View Article
- Bubenhofer SB, Schumacher CM, Koehler FM, Luechinger NA, Grass RN, Stark WJ: Large-scale synthesis of PbS–TiO2 heterojunction nanoparticles in a single step for solar cell application. J Phys Chem C 2012, 116: 16264. 10.1021/jp3036814View Article
- Wang CB, Jiang ZF, Wei L, Chen YX, Jiao J, Eastman M, Liu H: Photosensitization of TiO2 nanorods with CdS quantum dots for photovoltaic applications: a wet-chemical approach. Nano Energy 2012, 1: 440. 10.1016/j.nanoen.2012.02.005View Article
- Li YT, Wei L, Zhang RZ, Chen XY, Mei LM, Jiao J: Annealing effect on Sb2S3-TiO2 nanostructures for solar cell applications. Nanoscale Res Lett 2013, 8: 89. 10.1186/1556-276X-8-89View Article
- Moon FSJ, Itzhaik Y, Yum JH, Zakeeruddin SM, Hodes G, Grätzel M: Sb2S3-based mesoscopic solar cell using an organic hole conductor. J Phys Chem Lett 2010, 1: 1524. 10.1021/jz100308qView Article
- Sun WT, Yu Y, Pan HY, Gao XF, Chen Q, Peng LM: CdS quantum dots sensitized TiO2 nanotube-array photoelectrodes. J Am Chem Soc 2008, 130: 1124. 10.1021/ja0777741View Article
- Li GS, Wu L, Li F, Xu PP, Zhang DQ, Li HX: Photoelectrocatalytic degradation of organic pollutants via a CdS quantum dots enhanced TiO2 nanotube array electrode under visible light irradiation. Nanoscale 2013, 5: 2118. 10.1039/c3nr34253kView Article
- Zhang QX, Guo XZ, Huang XM, Huang SQ, Li DM, Luo YH, Shen Q, Toyoda T, Meng QB: Highly efficient CdS/CdSe-sensitized solar cells controlled by the structural properties of compact porous TiO2 photoelectrodes. Phys Chem Chem Phys 2011, 13: 4659. 10.1039/c0cp02099kView Article
- Shalom M, Dor S, Rühle S, Grinis L, Zaban A: Core/CdS quantum dot/shell mesoporous solar cells with improved stability and efficiency using an amorphous TiO2 coating. J Phys Chem C 2011, 113: 3895.View Article
- Xu J, Yang X, Wong TL, Lee CS: Large-scale synthesis of Cu2SnS3 and Cu1.8S hierarchical microspheres as efficient counter electrode materials for quantum dot sensitized solar cells. Nanoscale 2012, 4: 6537. 10.1039/c2nr31724aView Article
- Burschka J, Brault V, Ahmad S, Breau L, Nazeeruddin MK, Marsan B, Zakeeruddin SM, Grätzel M: Influence of the counter electrode on the photovoltaic performance of dye-sensitized solar cells using a disulfide/thiolate redox electrolyte. Energy Environ Sci 2012, 5: 6089. 10.1039/c2ee03005eView Article
- Knott EP, Craig MR, Liu DY, Babiarz JE, Dyer AL, Reynolds JR: A minimally coloured dioxypyrrole polymer as a counter electrode material in polymeric electrochromic window devices. J Mater Chem 2012, 22: 4953. 10.1039/c2jm15057cView Article
- Park H, Chang S, Jean J, Cheng JJ, Araujo PT, Wang MS, Bawendi MG, Dresselhaus MS, Bulovic V, Kong J, Gradečak S: Graphene cathode-based ZnO nanowire hybrid solar cells. Nano Lett 2013, 13: 233. 10.1021/nl303920bView Article
- Choi KS, Park Y, Kim SY: Comparison of graphene oxide with reduced graphene oxide as hole extraction layer in organic photovoltaic cells. J Nanosci Nanotechnol 2013, 13: 3282. 10.1166/jnn.2013.7265View Article
- Stefik M, Yum JH, Hua YL, Grätzel M: Carbon–graphene nanocomposite cathodes for improved Co(II/III) mediated dye-sensitized solar cells. J Mater Chem A 2013, 1: 4982. 10.1039/c3ta01635hView Article
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