Judicious design of indoline chromophores for high-efficiency iodine-free dye-sensitized solar cells

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题名:	Judicious design of indoline chromophores for high-efficiency iodine-free dye-sensitized solar cells
作者:	鄭芳怡;Wang, Zhihui;Wang, He;Liang, Mao;Tan, Yulin;Cheng, Fangyi;Sun, Zhe;Xue, Song
贡献者:	地球科學學院大氣科學學系
关键词:	absorption;cobalt;dyes;electrons;ions;irradiation;lighting;nanocrystals;photosensitizing agents;photostability;photovoltaic cells;titanium dioxide
日期:	2014-04-23
上传时间:	2026-04-21 13:56:29 (UTC+8)
出版者:	American Chemical Society;United States: American Chemical Society
摘要:	摘要： Indoline photosensitizers exhibit impressive short-circuit photocurrent but generally low molar extinction coefficient and rapid charge recombination, which limits their application in thin-film dye-sensitizerd solar cells (DSCs). Here, we incorporate a new dithieno[3,2-b:2′,3′-d]pyrrole (DTP) segment (i.e., dihexyloxy-triphenylamine (DHO-TPA) substituted DTP) as the conjugated π-linker to construct a series of high molar absorption coefficient indoline dyes (XW69, XW70, and XW71) for DSCs employing a cobalt(II/III) redox electrolyte. Interestingly, this DTP linker is demonstrated as an efficient building block, not only slowing down the kinetics of charge recombination of titania electrons with tris(1,10-phenanthroline)cobalt(III) ions but also making a great contribution to the light absorption properties in comparison with the dihexylaniline substituted DTP. With respect to the dihexyloxy-triphenylamine dye (XW68), these new indoline dyes exhibit stronger light-harvesting and thus better power conversion efficiency of DSCs made from thin titania films. Benefitting from the bulky rigidity of the donor and π-conjugation unit, the XW70 dye displays a promising conversion efficiency as high as 8.78%, with a short-circuit current density (J SC) of 13.3 mA cm–2, open-circuit voltage (V OC) of 943 mV, and fill factor (FF) of 0.70 under AM 1.5 illumination (100 mW cm–2). Furthermore, the effect of light irradiation on these dyes adsorbed on nanocrystalline TiO2 films was investigated, proving the photostability of these indoline chromophores. Our work has valued the feasibility of judicious design of indoline chromophores to obtain organic photosensitizers for high-efficiency iodine-free DSCs made from thin titania films. 其他題名： ACS Appl. Mater. Interfaces 出版者： United States: American Chemical Society 出版日期： 2014-04-23 出處： ACS applied materials & interfaces, 2014-04, Vol.6 (8), p.5768-5778 資源來源： ACS Journal Archive 1996 版權： Copyright © 2014 American Chemical Society 識別號： ISSN: 1944-8244 識別號： ISSN: 1944-8252 識別號： EISSN: 1944-8252 識別號： DOI: 10.1021/am500575s 識別號： PMID: 24666232
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