Electronic Properties and Photovoltaic Performances of a Series of Oligothiophene Copolymers Incorporating Both Thieno[3,2-b]thiophene and 2,1,3-Benzothiadiazole Moieties

✍ Scribed by Laure Biniek; Christos L. Chochos; Georges Hadziioannou; Nicolas Leclerc; Patrick Lévêque; Thomas Heiser

• Book ID: 102494664
• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 264 KB
• Volume: 31
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200900804

✦ Synopsis

Abstract

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.

magnified image