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Synthesis and Characterization of Cyclopentadithiophene‐based Low Bandgap Copolymers Containing Electron‐deficient Benzoselenadiazole Derivatives for Photovoltaic Devices by In Hwan Jung; Hoyeon Kim; Moo‐Jin Park; Bongjun Kim; Jong‐Hwa Park; Eunjae Jeong; Han Young Woo; Seunghyup Yoo; Hong‐Ku Shim is a Materials Science article available to read on EtoBox.
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## Abstract We have synthesized two cyclopentadithiophene (CDT)‐based low bandgap copolymers, poly[(4,4‐bis(2‐ethyl‐hexyl)‐4__H__‐cyclopenta[2,1‐__b__:3,4‐__b__′]dithiophene‐2,6‐diyl)‐__alt__‐(benzo[__c__][1,2,5]selenadiazole‐4,7‐diyl)] (PCBSe) and poly[(4,4‐bis(2‐ethyl‐hexyl)‐4__H__‐cyclopenta[2,1‐__b__:3,4‐__b__′]dithiophene‐2,6‐diyl)‐__alt__‐(4,7‐dithiophen‐2‐yl‐benzo[__c__][1,2,5]selenadiazole‐5,5′‐diyl)] (PCT2BSe), for use in photovoltaic applications. Through the internal charge transfer interaction between the electron‐donating CDT unit and the electron‐accepting benzoselenadiazole, we realized exceedingly low bandgap polymers with bandgaps of 1.37–1.46 eV. The UV–vis absorption maxima of PCT2BSe were subjected to larger hypsochromic shifts than those of PCBSe, because of the distorted electron donor–acceptor (D–A) structures of the PCT2BSe backbone. These results were supported by the calculations of the D–A complex using the __ab initio__ Hartree‐Fock method with a split‐valence 6‐31G\* basis set. However, PCT2BSe exhibited a better molar absorption coefficient in the visible region, which can lead to more efficient absorption of sunlight. As a result, PCT2BSe blended with
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- Author
- In Hwan Jung; Hoyeon Kim; Moo‐Jin Park; Bongjun Kim; Jong‐Hwa Park; Eunjae Jeong; Han Young Woo; Seunghyup Yoo; Hong‐Ku Shim
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-624X)
- Published
- 2010
- Language
- EN
- Field
- Materials Science (Physical Sciences)