High-Performance Organic Materials for Dye-Sensitized Solar Cells: Triarylene-Linked Dyads with a 4-tert-Butylphenylamine Donor

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Title:	High-Performance Organic Materials for Dye-Sensitized Solar Cells: Triarylene-Linked Dyads with a 4-tert-Butylphenylamine Donor
Authors:	Chang, YJ (Chang, Yuan Jay) Chou, PT (Chou, Po-Ting) Lin, SY (Lin, Szu-Yu) Watanabe, M (Watanabe, Motonori) Liu, ZQ (Liu, Zhi-Qian) Lin, JL (Lin, Ju-Ling) Chen, KY (Chen, Kew-Yu) Sun, SS (Sun, Shih-Sheng) Liu, CY (Liu, Ching-Yang) Chow, TJ (Chow, Tahsin J.)
Contributors:	Dept Appl Chem
Keywords:	carbazoles dyads organic materials solar cells triarylenes
Date:	2012-03
Issue Date:	2013-02-22 14:01:12 (UTC+8)
Abstract:	A series of organic dyes were prepared that displayed remarkable solar-to-energy conversion efficiencies in dye-sensitized solar cells (DSSCs). These dyes are composed of a 4-tert-butylphenylamine donor group (D), a cyanoacrylic-acid acceptor group (A), and a phenylene-thiophene-phenylene (PSP) spacer group, forming a D-p-A system. A dye containing a bulky tert-butylphenylene-substituted carbazole (CB) donor group showed the highest performance, with an overall conversion efficiency of 6.70?%. The performance of the device was correlated to the structural features of the donor groups; that is, the presence of a tert-butyl group can not only enhance the electron-donating ability of the donor, but can also suppress intermolecular aggregation. A typical device made with the CB-PSP dye afforded a maximum photon-to-current conversion efficiency (IPCE) of 80?% in the region 400480 nm, a short-circuit photocurrent density Jsc=14.63 mA?cm-2, an open-circuit photovoltage Voc=0.685 V, and a fill factor FF=0.67. When chenodeoxycholic acid (CDCA) was used as a co-absorbent, the open-circuit voltage of CB-PSP was elevated significantly, yet the overall performance decreased by 1618?%. This result indicated that the presence of 4-tert-butylphenyl substituents can effectively inhibit self-aggregation, even without CDCA.
Relation:	CHEMISTRY-AN ASIAN JOURNAL 卷: 7 期: 3 頁數: 572-581
Appears in Collections:	[Department of Chemistry & Graduate Institute of Applied Chemistry ] journal articles

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