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

doi:10.1088/1674-1056/25/8/088801

Abstract The sodium chloride methanol solution process is conducted on the conventional poly(3-hexylthiophene) (P3HT)/[6, 6]-phenyl-C61-butyric acid methyl ester (PC₆₁BM) polymer bulk heterojunction solar cells. The device exhibits a power conversion efficiency of up to 3.36%, 18% higher than that of the device without the solution process. The measurements of the active layer by x-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and ultraviolet photoelectron spectroscopy (UPS) indicate a slight phase separation in the vertical direction and a sodium chloride distributed island-like interface between the active layer and the cathode. The capacitance-voltage (C-V) and impedance spectroscopy measurements prove that the sodium chloride methanol process can reduce the electron injection barrier and improve the interfacial contact of polymer solar cells. Therefore, this one-step solution process not only optimizes the phase separation in the active layers but also forms a cathode buffer layer, which can enhance the generation, transport, and collection of photogenerated charge carriers in the device simultaneously. This work indicates that the inexpensive and non-toxic sodium chloride methanol solution process is an efficient one-step method for the low cost manufacturing of polymer solar cells.

Keywords: sodium chloride methanol polymer solar cell phase separation

Received: 27 January 2016
Revised: 25 February 2016
Accepted manuscript online:

PACS:	88.40.jr	(Organic photovoltaics)
	84.60.Jt	(Photoelectric conversion)
	64.75.St	(Phase separation and segregation in thin films)
	73.50.-h	(Electronic transport phenomena in thin films)

Fund: Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 2014JBZ009) and the National Natural Science Foundation of China (Grant Nos. 61274063, 61377028, 61475014, and 61475017).

Corresponding Authors: Yu-Feng Hu, Zhen-Bo Deng
E-mail: yfhu@bjtu.edu.cn;zbdeng@bjtu.edu.cn

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Tong-Fang Liu(刘统方), Yu-Feng Hu(胡煜峰), Zhen-Bo Deng(邓振波), Xiong Li(李熊), Li-Jie Zhu(朱丽杰), Yue Wang(王越), Long-Feng Lv(吕龙锋), Tie-Ning Wang(王铁宁), Zhi-Dong Lou(娄志东), Yan-Bing Hou(侯延冰), Feng Teng(滕枫) Sodium chloride methanol solution spin-coating process for bulk-heterojunction polymer solar cells 2016 Chin. Phys. B 25 088801

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

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