Efficiency enhancement of perovskite solar cells by fabricating as-prepared film before sequential spin-coating procedure

• Published in: Applied surface science Vol. 371; pp. 289 - 295
• Main Authors: Jiang, Jiajia, Tao, Hai jun, Chen, Shanlong, Tan, Bin, Zhou, Ning, Zhu, Lumin, Zhao, Yuan, Wang, Yuqiao, Tao, Jie
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.05.2016
• Subjects: CH3NH3PbI3; Deterioration; Devices; Electrodes; Modified sequentialdeposition method; Perovskite-based solar cells; Perovskites; Photovoltaic cells; Residual PbI2; Smooth morphology; Solar cells; Strategy; Titanium dioxide; Residual PbI2; Smooth morphology; CH3NH3PbI3; Perovskite-based solar cells; Modified sequentialdeposition method
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2016.02.206

Schematic illustration of modified two-step spin-coating procedure for MAPbI3 perovskite thin films. [Display omitted] •An as-prepared CH3NH3PbI3 and PbI2 film was introduced before the traditional two-step process.•Smooth morphology and trace amount of remaining PbI2 benefit the performance of solar cell.•The optimal as-prepared film introduced improves the efficiency of CH3NH3PbI3 solar cells from 9.11% to 11.16%. Sequential spin-coating procedure is a widely adopted strategy to prepare CH3NH3PbI3 on mesostructured TiO2 electrode for organolead halide perovskite-based solar cells. However, this method suffers from the rough surface and excessively residual PbI2 in the resulting perovskite film, deteriorating the device performance seriously. Herein, a facial modified sequential solution deposition method, by introducing an as-prepared CH3NH3PbI3 and PbI2 film before the traditional two-step process, was proposed to fabricate the perovskite-based solar cell with smooth morphology and trace amount of remaining PbI2. The optimal as-prepared film introduced improves the efficiency of CH3NH3PbI3 solar cells from 9.11% to 11.16%. The enhancement of device performance can be attributed to the increased light absorption ability and decreased recombination rate of carriers in CH3NH3PbI3 absorber.