- Nano Express
- Open Access
Fabrication and Properties of High-Efficiency Perovskite/PCBM Organic Solar Cells
© Chen et al. 2015
- Received: 11 May 2015
- Accepted: 25 July 2015
- Published: 5 August 2015
This work presents a CH3NH3PbI3/PCBM organic solar cell. Organic PCBM film and CH3NH3PbI3 perovskite film are deposited on the PEDOT:PSS/ITO glass substrate by the spin coating method. The performance of the organic solar cells was observed by changing the thickness of CH3NH3PbI3 perovskite. The thickness of a perovskite film can affect the carrier diffusion length in a device that strongly absorbs light in the red spectral region. The short-circuit current density and the power conversion efficiency were 21.9 mA/cm2 and 11.99 %, respectively, for the sample with 210-nm-thick CH3NH3PbI3 perovskite active layer.
- Organic solar cells
- CH3NH3PbI3 perovskite
Perovskite solar cell has attracted considerable attention because of its unique properties and potential applications. As the hybrid organic/inorganic lead halide perovskite (e.g., CH3NH3PbX3, X = I, Cl, Br) materials, perovskite has a high absorption coefficient, long hole–electron diffusion length (~0.1–1 μm), tunable band gaps, and good carrier transport [1–20]. The perovskite and its derivatives have been achieved in various types of solar cell architectures including perovskite-sensitized solar cells, mesoporous (mp)-TiO2/perovskite material, and planar p–i–n heterojunction solar cells [21–24]. However, CH3NH3PbI3 perovskite films can be prepared by dual-source thermal evaporation system , vapor-assisted solution process , and one-step and two-step spin coating procedures for CH3NH3PbI3 formation [27, 28] which has many advantages such as low cost, low temperature, and ease of control.
In this work, we report the solution process fabrication of perovskite solar cells which comprised an architecture CH3NH3PbI3 perovskites formed by a solvent-engineering technology. This study investigated the optical, structural, and surface properties of a perovskite film that is grown on PEDOT:PSS/ITO electrodes by the solvent-engineering technology as functions of thickness in high-performance perovskite solar cells.
A field emission scanning electron microscope (FESEM) (LEO 1530) was used to observe the cross section and surface morphology of the cells. Moreover, the current density–voltage (J–V) characteristics were measured using a Keithley 2420 programmable source meter under irradiation by a 1000-W xenon lamp. Finally, the irradiation power density on the surface of the sample was calibrated as 1000 W/m2.
Measurements of all samples in this study
J sc (mA/cm2)
V oc (V)
R s (Ω)
High-efficiency and low-cost perovskite/PCBM organic solar cells with various thicknesses of CH3NH3PbI3 perovskite were fabricated. The PCBM film as the electron transport layer in the cell structure can improve the optical absorption in the wavelength range of 300–500 nm, and the absorption in the wavelength range of 500–760 nm is lightly dropped according to the comparison between the samples of PCBM/CH3NH3PbI3 on substrate and CH3NH3PbI3 on substrate. The short-circuit current density and the power conversion efficiency were 21.9 mA/cm2 and 11.99 %, respectively, for the optimal measured parameters of the sample with 210-nm-thick CH3NH3PbI3 perovskite.
Financial support of this paper was provided by the Ministry of Science and Technology of the Republic of China under Contract No. NSC 103-2221-E-027-029-MY2.
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