Efficient ternary bulk heterojunction solar cells based on small molecules only

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题名:	Efficient ternary bulk heterojunction solar cells based on small molecules only
作者:	吳春桂;Huang, Tzu-Yen;Patra, Dhananjaya;Hsiao, Yu-Sheng;Chang, Sheng Hsiung;Wu, Chun-Guey;Ho, Kuo-Chuan;Chu, Chih-Wei
贡献者:	理學院化學學系
日期:	2015-05-21
上传时间:	2026-04-21 14:36:42 (UTC+8)
出版者:	Royal Society of Chemistry
摘要:	摘要： Ternary bulk heterojunctions (BHJs) are platforms that can improve the power conversion efficiencies of organic solar cells. In this paper, we report an all-small-molecule ternary BHJ solar cell incorporating [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) and indene-C 60 bisadduct (ICBA) as mixed acceptors and the conjugated small molecule (2 Z ,2′ E )-dioctyl 3,3′-(5′′,5′′′′′-(4,8-bis(5-octylthiophen-2-yl)benzo[1,2- b :5,4- b ′]dithiophene-2,6-diyl)bis(3,4′,4′′-trioctyl-[2,2′:5′,2′′-terthiophene]-5′′,5-diyl))bis(2-cyanoacrylate) (BDT6T) as a donor. When incorporating a 15% content of ICBA relative to PC 71 BM, the ternary BHJ solar cell reached a power conversion efficiency of 6.36% with a short-circuit current density ( J SC ) of 12.00 mA cm −2 , an open-circuit voltage ( V OC ) of 0.93 V, and a fill factor of 0.57. The enhancement in efficiency, relative to that of the binary system, resulted mainly from the increased value of J SC , attributable to not only the better intermixing of the donor and acceptor that improved charge transfer but also the more suitable morphology for efficient dissociation of excitons and more effective charge extraction. Our results suggest that there is great potential for exceeding the efficiencies of binary solar cells by adding a third component, without sacrificing the simplicity of the fabrication process. Efficient ternary BHJ solar cells fabricated using small molecules-namely BDT6T, ICBA, and PC 71 BM-achieving a PCE of 6.36%. 出版日期： 2015-05-05 資源來源： Royal Society of Chemistry 識別號： ISSN: 2050-7488 識別號： EISSN: 2050-7496 識別號： DOI: 10.1039/c5ta00592b
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