Sodium chloride methanol solution spin-coating process for bulk-heterojunction polymer solar cells

Liu Tong-Fang¹, Hu Yu-Feng^{1, †,}, Deng Zhen-Bo^{1, ‡,}, Li Xiong², Zhu Li-Jie¹, Wang Yue¹, Lv Long-Feng¹, Wang Tie-Ning¹, Lou Zhi-Dong¹, Hou Yan-Bing¹, Teng Feng¹

C–V characteristics under different photoexcitation intensities and impedance spectra of the PSCs based on P3HT:PC₆₁BM. (a) C–V characteristics of the device without treatment. (b) C–V characteristics of the device with methanol treatment. (c) C–V characteristics of the device with NaCl methanol treatment. (d) Impedance spectra with or without treatment.