Effects of precursor solution composition on the performance and I-V hysteresis of perovskite solar cells based on CH3NH3PbI3-xClx.
Precursor solution of CH3NH3PbI3-xClxfor perovskite solar cells was conventionally prepared by mixing PbCl2and CH3NH3I with a mole ratio of 1:3 (PbCl2:CH3NH3I). While in the present study, CH3NH3PbI3-xClx-based solar cells were fabricated using the precursor solutions containing PbCl2and CH3NH3I with the mole ratios of 1:3, 1.05:3, 1.1:3, and 1.15:3, respectively. The results display that the solar cells with the mole ratio of 1.1:3 present higher power conversion efficiency and less I-V hysteresis than those with the mole ratio of 1:3. Based on some investigations, it is concluded that the higher efficiency could be due to the smooth and pinhole free film formation, high optical absorption, suitable energy band gap, and the large electron transfer efficiency, and the less I-V hysteresis may be attributed to the small low frequency capacitance of the device.
School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
Z L
ZL
Zhang
Henan Vocational College of Agriculture, Zhongmu, 451450, China.
B Q
BQ
Men
School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
Y F
YF
Liu
School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
H P
HP
Gao
School of Physics and Electronics, Henan University, Kaifeng, 475004, China. ylmao1@163.com.|Institute for Computational Materials Science, Henan University, Kaifeng, 475004, China. ylmao1@163.com.
Y L
YL
Mao
CH3NH3PbI3-xClx; I-V hysteresis; Precursor solution composition