Spontaneous open-circuit voltage gain of fully fabricated organic solar cells caused by elimination ofinterfacial energy disorder

作者:Sun, R (Sun, Rui)^{[ 1 ]} ; Deng, D (Deng, Dan)^{[ 2 ]} ; Guo, J (Guo, Jing)^{[ 1 ]} ; Wu, Q (Wu, Qiang)^{[ 1 ]} ; Guo, J (Guo, Jie)^{[ 1 ]} ; Shi, MM (Shi, Mumin)^{[ 1 ]} ; Shi, K (Shi, Kui)^{[ 3,4 ]} ; Wang, T (Wang, Tao)^{[ 5 ]} ; Xue, LJ (Xue, Longjian)^{[ 3,4 ]} ; Wei, ZX (Wei, Zhixiang)^{[ 2 ]} ...更多内容

ENERGY & ENVIRONMENTAL SCIENCE

卷: 12

期: 8

DOI: 10.1039/c9ee00825j

出版年: AUG 1 2019

文献类型:Article

摘要

The realization of high open-circuit voltage (V-oc) in organic solar cells (OSCs) mainly depends on the delicate donor (D) and acceptor (A) structures, meticulously optimized bulk heterojunction (BHJ) microstructure and functionalized interfacial materials. In this work, we demonstrate a spontaneous V-oc gain in efficient OSCs without sacrificing the short-circuit current (J(sc)) and fill factor (FF). Using a combination of device studies and morphological analysis, we point out that the spontaneous phenomenon occurred at the bottom of the BHJ layer, which is caused by [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) acceptors spontaneously migrating to the BHJ/ZnO interface under ambient conditions. Furthermore, physical characterization determines the relation between morphology evolution and spontaneous V-oc enhancement, which mainly results from the eliminated energetic disorder at the BHJ/ZnO interface. The investigation of surface energy parameters among selected components highlights the wetting coefficient as a dominant dynamic for this spontaneous phenomenon. Besides, a wide range of photovoltaic systems introduced for enabling parallel verification also confirm the effect of the interfacial surface energy on V-oc spontaneous enhancement in inverted solar cells. These findings exemplify the importance of surface energy modification as a tool for improved interfaces of layered morphology, and open new routes to device interfacial optimization using novel design strategies of photoactive materials and interfacial materials. Such a spontaneous phenomenon may open a novel field for making materials work in an intelligent way in organicelectronics.

关键词

KeyWords Plus:BULK-HETEROJUNCTION; SURFACE-ENERGY; EFFICIENCY; LAYER; PERFORMANCE; MORPHOLOGY; BLENDS; POLYCARBONATE; RECOMBINATION; RESISTANCE

作者信息

通讯作者地址: Min, J (通讯作者)

Wuhan Univ, Inst Adv Studies, Wuhan 430072, Hubei, Peoples R China.

通讯作者地址: Wei, ZX (通讯作者)

Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Nanosyst & Hierarch Fabricat, Beijing 100190, Peoples R China.

原文PDF链接：

https://pubs.rsc.org/en/content/articlelanding/2019/EE/C9EE00825J#!divAbstract