A low-energy-gap organic dye for high-performance small-molecule organic solar cells.

Li-Yen Lin, Yi-Hong Chen, Zheng-Yu Huang, Hao-Wu Lin, Shu-Hua Chou, Francis Lin, Chang-Wen Chen, Yi-Hung Liu, Ken-Tsung Wong

Index: J. Am. Chem. Soc. 133 , 15822-15825, (2011)

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Abstract

A novel donor-acceptor-acceptor (D-A-A) donor molecule, DTDCTB, in which an electron-donating ditolylaminothienyl moiety and an electron-withdrawing dicyanovinylene moiety are bridged by another electron-accepting 2,1,3-benzothiadiazole block, has been synthesized and characterized. A vacuum-deposited organic solar cell employing DTDCTB combined with the electron acceptor C(70) achieved a record-high power conversion efficiency (PCE) of 5.81%. The respectable PCE is attributed to the solar spectral response extending to the near-IR region and the ultracompact absorption dipole stacking of the DTDCTB thin film.