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DOI	10.1039/d0ee00714e
	15.34% efficiency all-small-molecule organic solar cells with an improved fill factor enabled by a fullerene additive
	Hu D.; Yang Q.; Chen H.; Wobben F.; Le Corre V.M.; Singh R.; Liu T.; Ma R.; Tang H.; Koster L.J.A.; Duan T.; Yan H.; Kan Z.; Xiao Z.; Lu S.
发表日期	2020
ISSN	17545692
起始页码	2134
结束页码	2141
卷号	13 期号:7
英文摘要	Solution processed organic solar cells (OSCs) composed of all small molecules (ASM) are promising for production on an industrial scale owing to the properties of small molecules, such as well-defined chemical structures, high purity of materials, and outstanding repeatability from batch to batch synthesis. Remarkably, ASM OSCs with power conversion efficiency (PCE) beyond 13% were achieved by structure improvement of the electron donor and choosing Y6 as the electron acceptor. However, the fill factor (FF) is an obstacle that limits the further improvement of the PCE for these ASM OSCs. Herein, we focus on the FF improvement of recently reported ASM OSCs with BTR-Cl:Y6 as the active layer by miscibility-induced active layer morphology optimization. The incorporation of fullerene derivatives, which have good miscibility with both BTR-Cl and Y6, results in reduced bimolecular recombination and thus improved FF. In particular, when ca. 5 wt% of PC71BM was added in the active layer, a FF of 77.11% was achieved without sacrificing the open circuit voltage (VOC) and the short circuit current density (JSC), leading to a record PCE of 15.34% (certified at 14.7%) for ASM OSCs. We found that the optimized device showed comparable charge extraction, longer charge carrier lifetime, and slower bimolecular recombination rate compared with those of the control devices (w/o fullerene). Our results demonstrate that the miscibility driven regulation of active layer morphology by incorporation of a fullerene derivative delicately optimizes the active layer microstructures and improves the device performance, which brings vibrancy to OSC research. © 2020 The Royal Society of Chemistry.
英文关键词	Charge carriers; Chlorine compounds; Conversion efficiency; Efficiency; Fullerenes; Molecules; Morphology; Open circuit voltage; Solubility; Synthesis (chemical); Bimolecular recombination; Device performance; Fullerene derivative; Optimized devices; Power conversion efficiencies; Small-molecule organic solar cells; Solution-processed; Structure improvement; Organic solar cells; additive; concentration (composition); energy efficiency; fuel cell; fullerene; molecular analysis; organic compound
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/189606
作者单位	Chongqing Institute of Green and Intelligent Technology, Chongqing School, University of Chinese Academy of Sciences (UCAS Chongqing), Chinese Academy of Sciences, Chongqing, 400714, China; Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen, NL-9747AG, Netherlands; Department of Energy and Materials Engineering, Dongguk University, Seoul, 100-715, South Korea; Department of Chemistry, Hong Kong Branch, Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong
推荐引用方式 GB/T 7714	Hu D.,Yang Q.,Chen H.,et al. 15.34% efficiency all-small-molecule organic solar cells with an improved fill factor enabled by a fullerene additive[J],2020,13(7).
APA	Hu D..,Yang Q..,Chen H..,Wobben F..,Le Corre V.M..,...&Lu S..(2020).15.34% efficiency all-small-molecule organic solar cells with an improved fill factor enabled by a fullerene additive.Energy & Environmental Science,13(7).
MLA	Hu D.,et al."15.34% efficiency all-small-molecule organic solar cells with an improved fill factor enabled by a fullerene additive".Energy & Environmental Science 13.7(2020).