Zhang Z L, Men B Q, Liu Y F, Gao H P, Mao Y L
School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
Henan Vocational College of Agriculture, Zhongmu, 451450, China.
Nanoscale Res Lett. 2017 Dec;12(1):84. doi: 10.1186/s11671-017-1872-8. Epub 2017 Feb 3.
Precursor solution of CHNHPbICl for perovskite solar cells was conventionally prepared by mixing PbCl and CHNHI with a mole ratio of 1:3 (PbCl:CHNHI). While in the present study, CHNHPbICl-based solar cells were fabricated using the precursor solutions containing PbCl and CHNHI 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.
用于钙钛矿太阳能电池的CHNHPbICl前驱体溶液传统上是通过将PbCl和CHNHI以1:3的摩尔比（PbCl:CHNHI）混合来制备的。而在本研究中，基于CHNHPbICl的太阳能电池是分别使用含有摩尔比为1:3、1.05:3、1.1:3和1.15:3的PbCl和CHNHI的前驱体溶液制造的。结果表明，摩尔比为1.1:3的太阳能电池比摩尔比为1:3的太阳能电池具有更高的功率转换效率和更小的I-V滞后。基于一些研究得出结论，更高的效率可能归因于形成了光滑且无针孔的薄膜、高光学吸收率、合适的能带隙以及大的电子转移效率，而较小的I-V滞后可能归因于器件的小低频电容。
