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Electronic Properties and Photovoltaic Performances of a Series of Oligothiophene Copolymers Incorporating Both Thieno[3,2‐ b ]thiophene and 2,1,3‐Benzothiadiazole Moieties
Author(s) -
Biniek Laure,
Chochos Christos L.,
Hadziioannou Georges,
Leclerc Nicolas,
Lévêque Patrick,
Heiser Thomas
Publication year - 2010
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900804
Subject(s) - thiophene , materials science , copolymer , stille reaction , polymer solar cell , cyclic voltammetry , conjugated system , polymer chemistry , polymerization , energy conversion efficiency , organic solar cell , electron acceptor , photochemistry , electrochemistry , polymer , organic chemistry , optoelectronics , chemistry , electrode , composite material
A series of donor‐acceptor alternated conjugated copolymers, composed of thiophene, bithiophene, thieno[3,2‐ b ]thiophene, and 2,1,3‐benzothiadiazole units and differing from each other by the nature and the number of 3‐alkylthiophene in the backbone, have been synthesized by Stille cross‐coupling polymerization. The material's optical and electrochemical properties, in solution and in thin films, have been investigated using UV‐Visible absorption and cyclic voltammetry. Bulk heterojunction solar cells using blends of the newly synthesized copolymers, as electron donor, and C60‐PCBM or C70‐PCBM, as electron transporting material, have been elaborated. A maximum power conversion efficiency of 1.8% is achieved with a 1:4 PPBzT 2 ‐C12:C70‐PCBM weight ratio.