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DOI	10.1039/d0ee01896a
	The role of bulk and interfacial morphology in charge generation, recombination, and extraction in non-fullerene acceptor organic solar cells
	Karki A.; Vollbrecht J.; Gillett A.J.; Xiao S.S.; Yang Y.; Peng Z.; Schopp N.; Dixon A.L.; Yoon S.; Schrock M.; Ade H.; Reddy G.N.M.; Friend R.H.; Nguyen T.-Q.
发表日期	2020
ISSN	17545692
起始页码	3679
结束页码	3692
卷号	13 期号:10
英文摘要	Some fundamental questions in the organic solar cell (OSC) community are related to the role of bulk and interfacial morphology on key processes such as charge generation, recombination, and extraction that dictate power conversion efficiencies (PCEs). The challenges with answering these questions arise due to the difficulty in accurately controlling, as well as comprehensively characterizing the morphology in bulk-heterojunction (BHJ) OSC blends. In this work, large variations in the interfacial and bulk morphologies of different low molecular weight fraction (LMWF) PM6:Y6 blends were detected despite the blends being fabricated from ostensibly the same building blocks. A drop in PCE from ~15% to ~5% was observed when the concentration of LMWFs of the PM6 polymer was increased from 1% to 52%. The drop in PCEs is found to be due to the lowering of the short-circuit current density (JSC) and fill-factor (FF) values as a result of compromised charge generation efficiencies, increased bulk trap densities, reduced charge transport, and inefficient charge extraction. The origin of the high device performance in the 1% LMWF blend is rationalized by the favorable bulk and interfacial morphological features, resolved from four techniques at sub-nanometer to sub-micrometer length scales. First, the closer donor:acceptor (D:A) interactions, smaller D and A domains, and increased D:A interfacial area facilitate ultrafast electron and hole transfer at the D:A interface. Second, the better long-range ordering and optimal phase separation of the D:A regions lead to superior charge transport and extraction. © The Royal Society of Chemistry.
英文关键词	Carrier transport; Drops; Efficiency; Extraction; Heterojunctions; Morphology; Phase separation; Solar power generation; Bulk heterojunction (BHJ); Charge extraction; Charge generation; Device performance; Interfacial morphologies; Low molecular weight; Morphological features; Power conversion efficiencies; Organic solar cells
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/189505
作者单位	Center for Polymers and Organic Solids, University of California Santa Barbara (UCSB), Santa Barbara, CA 93106, United States; Optoelectronics Group Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom; 1-Material Inc, 2290 Chemin St-François, Dorval, H9P 1K2, Canada; Department of Physics and Organic and Carbon Electronics Laboratories (ORaCEL), North Carolina State University, Raleigh, 27695, United States; Department of Chemistry, University of Lille, Centrale Lille Institut, Lille, F-59000, France
推荐引用方式 GB/T 7714	Karki A.,Vollbrecht J.,Gillett A.J.,et al. The role of bulk and interfacial morphology in charge generation, recombination, and extraction in non-fullerene acceptor organic solar cells[J],2020,13(10).
APA	Karki A..,Vollbrecht J..,Gillett A.J..,Xiao S.S..,Yang Y..,...&Nguyen T.-Q..(2020).The role of bulk and interfacial morphology in charge generation, recombination, and extraction in non-fullerene acceptor organic solar cells.Energy & Environmental Science,13(10).
MLA	Karki A.,et al."The role of bulk and interfacial morphology in charge generation, recombination, and extraction in non-fullerene acceptor organic solar cells".Energy & Environmental Science 13.10(2020).