Toward environmentally compatible molecular solar cells processed from halogen-free solvents

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题名:	Toward environmentally compatible molecular solar cells processed from halogen-free solvents
作者:	吳春桂;Farahat, Mahmoud E;Tsao, Cheng-Si;Huang, Yu-Ching;Chang, Sheng Hsiung;Budiawan, Widhya;Wu, Chun-Guey;Chu, Chih-Wei
贡献者:	理學院化學學系
关键词:	Active control;Annealing;Carbon;carbon disulfide;chemistry;chloroform;Current density;Devices;hexane;Photovoltaic cells;polydimethylsiloxane;separation;Solar cells;solar energy;Solvents;tetrahydrofuran;toluene;toxicity
日期:	2016-01-01
上传时间:	2026-04-21 14:42:24 (UTC+8)
出版者:	Royal Society of Chemistry
摘要:	摘要： Replacing toxic halogenated solvents with eco-friendly solvents will be necessary for the upscaling and mass production of organic photovoltaics (OPVs). In this study, toluene (Tol), a halogen-free solvent, was employed in the fabrication of molecular solar cells, achieving a power conversion efficiency (PCE) higher than that obtained when using a chlorinated counterpart, chloroform (CF). SMPV1, a two-dimensional conjugated small molecule, was used as the donor and [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) as the acceptor to form bulk heterojunction (BHJ) OPVs. The as-cast device formed using Tol displayed a PCE of 5.4%, higher than that (4.8%) achieved using CF. Combining the effects of thermal annealing and polydimethylsiloxane (PDMS) as a solvent additive, the PCEs of devices prepared using Tol and CF reached 6.20 and 5.52%, respectively. Solvent vapor annealing (SVA), a powerful tool for controlling the morphology of the active layer, had a great impact on the device performance. Tol, tetrahydrofuran (THF), carbon disulphide (CS 2 ), and hexane (Hex) were tested as halogen-free solvents for SVA treatment. Tol- and THF-SVA had positive effects on PCEs, reaching 7.04 and 6.50%, respectively. The enhancement arose mainly from the improvement in the fill factor, due to morphological manipulation and favorable phase separation. CS 2 - and Hex-SVA treatment had negative effects on the short-circuit current density and, hence, the overall PCE. A PCE of greater than 7% is the highest performance reported to date when using a halogen-free solvent to prepare small-molecule solar cells. A PCE of greater than 7% is the highest achieved so far when using halogen-free solvents for small-molecule OPV processing. 出版日期： 2016-01-01 出處： Journal of materials chemistry. A, Materials for energy and sustainability, 2016-01, Vol.4 (19), p.7341-7351 資源來源： Royal Society of Chemistry 識別號： ISSN: 2050-7488 識別號： ISSN: 2050-7496 識別號： EISSN: 2050-7496 識別號： DOI: 10.1039/c6ta01368f
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