气候变化领域集成服务门户(CCPortal): Spontaneous open-circuit voltage gain of fully fabricated organic solar cells caused by elimination of interfacial energy disorder

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DOI	10.1039/c9ee00825j
	Spontaneous open-circuit voltage gain of fully fabricated organic solar cells caused by elimination of interfacial energy disorder
	Sun R.; Deng D.; Guo J.; Wu Q.; Guo J.; Shi M.; Shi K.; Wang T.; Xue L.; Wei Z.; Min J.
发表日期	2019
ISSN	17545692
起始页码	2518
结束页码	2528
卷号	12 期号:8
英文摘要	The realization of high open-circuit voltage (Voc) 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 Voc gain in efficient OSCs without sacrificing the short-circuit current (Jsc) 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 Voc 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 Voc 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 organic electronics. © The Royal Society of Chemistry 2019.
英文关键词	Butyric acid; Heterojunctions; Interfacial energy; Morphology; Open circuit voltage; Photovoltaic cells; Photovoltaic effects; Solar power generation; Timing circuits; Wetting; Bulk heterojunction (BHJ); Inverted solar cells; Morphological analysis; Morphology evolution; Photoactive materials; Photovoltaic systems; Physical characterization; Surface energy parameters; Organic solar cells; energy efficiency; fuel cell; optimization; solar power
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189852
作者单位	Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China; CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China; Institute of Technological Science, School of Power and Mechanical Engineering, Wuhan University, South Donghu Road 8, Wuhan, 430072, China; School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China
推荐引用方式 GB/T 7714	Sun R.,Deng D.,Guo J.,et al. Spontaneous open-circuit voltage gain of fully fabricated organic solar cells caused by elimination of interfacial energy disorder[J],2019,12(8).
APA	Sun R..,Deng D..,Guo J..,Wu Q..,Guo J..,...&Min J..(2019).Spontaneous open-circuit voltage gain of fully fabricated organic solar cells caused by elimination of interfacial energy disorder.Energy & Environmental Science,12(8).
MLA	Sun R.,et al."Spontaneous open-circuit voltage gain of fully fabricated organic solar cells caused by elimination of interfacial energy disorder".Energy & Environmental Science 12.8(2019).