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DOI	10.1039/c8ee01559g
	Measuring the competition between bimolecular charge recombination and charge transport in organic solar cells under operating conditions
	Heiber M.C.; Okubo T.; Ko S.-J.; Luginbuhl B.R.; Ran N.A.; Wang M.; Wang H.; Uddin M.A.; Woo H.Y.; Bazan G.C.; Nguyen T.-Q.
发表日期	2018
ISSN	17545692
起始页码	3019
结束页码	3032
卷号	11 期号:10
英文摘要	The rational design of new high performance materials for organic photovoltaic (OPV) applications is largely inhibited by a lack of design rules for materials that have slow bimolecular charge recombination. Due to the complex device physics present in OPVs, rigorous and reliable measurement techniques for charge transport and charge recombination are needed to construct improved physical models that can guide materials development and discovery. Here, we develop a new technique called impedance-photocurrent device analysis (IPDA) to quantitatively characterize the competition between charge extraction and charge recombination under steady state operational conditions. The measurements are performed on actual lab scale solar cells, have mild equipment requirements, and can be integrated into normal device fabrication and testing workflows. We perform IPDA tests on a broad set of devices with varying polymer:fullerene blend chemistry and processing conditions. Results from the IPDA technique exhibit significantly improved reliability and self-consistency compared to the open-circuit voltage decay technique (OCVD). IPDA measurements also reveal a significant negative electric field dependence of the bimolecular recombination coefficient in high fill factor devices, a finding which is inaccessible to most other common techniques and indicates that many of these techniques may overestimate the value that is most relevant for describing device performance. Future work utilizing IPDA to build structure-property relationships for bimolecular recombination will lead to enhanced design rules for creating efficient OPVs that are suitable for commercialization. © 2018 The Royal Society of Chemistry.
英文关键词	Blending; Electric fields; Open circuit voltage; Organic solar cells; Bimolecular recombination; Bimolecular recombination coefficient; Electric field dependence; Equipment requirements; Open circuit voltage decays; Operational conditions; Organic photovoltaic (OPV); Structure property relationships; Solar cells; electric field; fuel cell; measurement method; molecular analysis; operations technology; performance assessment; photovoltaic system; solar activity
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/190103
作者单位	Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106, United States; Center for Hierarchical Materials Design (CHiMaD), Northwestern University, Evanston, IL 60208, United States; Department of Science, Kindai University, Higashiosaka, Osaka, 577-8502, Japan; Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106, United States; Mitsubishi Chemical Center for Advanced Materials, University of California, Santa Barbara, CA 93106, United States; Department of Chemistry, Korea University, Seoul, 136-713, South Korea
推荐引用方式 GB/T 7714	Heiber M.C.,Okubo T.,Ko S.-J.,et al. Measuring the competition between bimolecular charge recombination and charge transport in organic solar cells under operating conditions[J],2018,11(10).
APA	Heiber M.C..,Okubo T..,Ko S.-J..,Luginbuhl B.R..,Ran N.A..,...&Nguyen T.-Q..(2018).Measuring the competition between bimolecular charge recombination and charge transport in organic solar cells under operating conditions.Energy & Environmental Science,11(10).
MLA	Heiber M.C.,et al."Measuring the competition between bimolecular charge recombination and charge transport in organic solar cells under operating conditions".Energy & Environmental Science 11.10(2018).