Effects of acetone-soaking treatment on the performance of polymer solar cells based on P3HT/PCBM bulk heterojunction

doi:10.1088/1674-1056/23/11/118802

Abstract

The improvement of the acetone-soaking treatment to the performance of polymer solar cells based on the P3HT/PCBM bulk heterojunction is reported. Undergoing acetone-soaking, the PCBM does not distribute uniformly in the vertical direction, a PCBM enrichment layer forms on the top of the active layer, which is beneficial to the collection of the carriers and blocking the inverting diffusion carriers. X-ray photoelectron spectroscopy (XPS) analysis reveals that the PCBM weight ratio on the top of the active layer increases by 20% after the acetone-soaking treatment. Due to the nonuniform distribution of PCBM, the short-circuit current density, the open-circuit voltage, and the fill factor are enhanced significantly. Finally, the power conversion efficiency of the acetone-soaking device increases by 31% compared with the control device.

Keywords: polymer solar cells solvent treatment vertical phase separation morphology

Received: 25 February 2014
Revised: 10 May 2014
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 National Natural Science Foundation of China (Grant Nos. 61275175, 61177017, and 61377028) and the National Natural Science Foundation of China for Distinguished Yong Scholars (Grant No. 61125505).

Corresponding Authors: Teng Feng, Hou Yan-Bing
E-mail: FTeng@bjtu.edu.cn;ybhou@bjtu.edu.cn

Cite this article:

Liu Yu-Xuan (刘宇譞), Lü Long-Feng (吕龙峰), Ning Yu (宁宇), Lu Yun-Zhang (陆运章), Lu Qi-Peng (鲁启鹏), Zhang Chun-Mei (张春梅), Fang Yi (方一), Tang Ai-Wei (唐爱伟), Hu Yu-Feng (胡煜峰), Lou Zhi-Dong (娄志东), Teng Feng (滕枫), Hou Yan-Bing (侯延冰) Effects of acetone-soaking treatment on the performance of polymer solar cells based on P3HT/PCBM bulk heterojunction 2014 Chin. Phys. B 23 118802

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Effects of acetone-soaking treatment on the performance of polymer solar cells based on P3HT/PCBM bulk heterojunction

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