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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Affiliation: | 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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