Anthracene-based Dyes with High Open Circuit Potential for Dye-Sensitized Solar Cells

Chen-Yu Yeh^a

^aNational Chung Hsing University, Department of Chemistry, Taiwan, Guoguang Road, 250, Taiwan, Republic of China

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Chen-Yu Yeh, 162
Publication date: 5th February 2015

A series of simple metal-free organic dyes with an acetylene bridge have been designed and synthesized, and their optical, electrochemical, and photovoltaic properties were investigated. The molecular structures are based on a push-pull framework with a triphenyamine, naphthyldiphenylamine, or anthracenyldiphenylamine as the donor connected to a carboxyphenyl acceptor via a C≡Cbond. The speciality of this new dye design is to obtain higher device open-circuit potentials. The dye-sensitized solar cells using this new sensitizer in combination with I^-/I₃^-exhibited exceptionally high V_OC values of 810, 844, and 866 mV for MS1, MS2, and MS3, respectively. The absorption bands of the anthracene-bridged dye MS3 showed remarkable peak broadening and red shifts due to the strong electronic coupling between the donor and bridge facilitated by the C-Ctriple bond, significantly promoting the light-harvesting capability. The resulting devices of MS3 showed large IPCE values of 75-80% in the region 370-590 nm, giving J_SC/mA cm^-2=8.16, V_OC/mV= 866, FF = 0.76, and η =5.44% under standard AM 1.5 G one-sun irradiation.

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