Title: Fine Tuning of HOMO Energy Levels for Low-Band-Gap Photovoltaic Copolymers Containing Cyclopentadithienopyrrole and Bithiazole Units
Authors: Patra, Dhananjaya
Sahu, Duryodhan
Padhy, Harihara
Kekuda, Dhananjay
Chu, Chih-Wei
Wei, Kung-Hwa
Lin, Hong-Cheu
Department of Materials Science and Engineering
Department of Photonics
Keywords: bithiazoles;conjugated polymers;dithienopyrroles;low bandgaps;synthesis
Issue Date: 15-Sep-2011
Abstract: Five conjugated LBG polymers P1-P5 consisting of a DTP unit as an electron donor and various bithiazole units as electron acceptors are designed and synthesized for photovoltaic applications. The effects of the electron-deficient bithiazole derivatives on the thermal, optical, electrochemical, and photovoltaic properties are investigated. The molecular structures are confirmed and characterized. The resulting polymers have high thermal stabilities and broad absorption bands with low optical bandgaps. The hole and electron mobilities are calculated. PSC devices are fabricated utilizing the polymers as electron donors and PCBM as an electron acceptor. The PSC device with an active layer of P4:PCBM (1:1 by weight) exhibits the best power-conversion efficiency.
URI: http://dx.doi.org/10.1002/macp.201100164
ISSN: 1022-1352
DOI: 10.1002/macp.201100164
Volume: 212
Issue: 18
Begin Page: 1960
End Page: 1970
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