High‐Performance Organic Materials for Dye‐Sensitized Solar Cells: Triarylene‐Linked Dyads with a 4‐tert‐Butylphenylamine Donor |
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Authors: | Dr Yuan Jay Chang Po‐Ting Chou Szu‐Yu Lin Dr Motonori Watanabe Zhi‐Qian Liu Ju‐Ling Lin Prof Dr Kew‐Yu Chen Prof Dr Shih‐Sheng Sun Prof Dr Ching‐Yang Liu Prof Dr Tahsin J Chow |
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Institution: | 1. Department of Chemistry, National Taiwan University, Taipei 106 (Taiwan);2. Institute of Chemistry, Academia Sinica, Taipei 115 (Taiwan), Fax: (+886)?2‐27884179;3. Department of Chemical Engineering, Feng Chia University, Taichung 40724 (Taiwan);4. Department of Applied Chemistry, Chinese Culture University, Taipei 111 (Taiwan) |
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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‐π‐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 400–480 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 16–18 %. This result indicated that the presence of 4‐tert‐butylphenyl substituents can effectively inhibit self‐aggregation, even without CDCA. |
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Keywords: | carbazoles dyads organic materials solar cells triarylenes |
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