Synthesis and Characterization of Cyclopentadithiophene-Based Low Bandgap Copolymers Containing Electron-Deficient Benzoselenadiazole Derivatives for Photovoltaic Devices
- Authors
- Jung, In Hwan; Kim, Hoyeon; Park, Moo-Jin; Kim, Bongjun; Park, Jong-Hwa; Jeong, Eunjae; Woo, Han Young; Yoo, Seunghyup; Shim, Hong-Ku
- Issue Date
- Mar-2010
- Publisher
- JOHN WILEY & SONS INC
- Citation
- JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.48, no.6, pp 1423 - 1432
- Pages
- 10
- Journal Title
- JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
- Volume
- 48
- Number
- 6
- Start Page
- 1423
- End Page
- 1432
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147978
- DOI
- 10.1002/pola.23910
- ISSN
- 0887-624X
1099-0518
- Abstract
- We have synthesized two cyclopentadithiophene (CDT)-based low bandgap copolymers, poly[(4,4-bis(2-ethylhexyl)-4H-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-ethylhexyl)-4H-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 [6,6]-phenyl-C-61-butyric acid methyl ester (PC61BM) exhibited a better photovoltaic performance than PCBSe because of the larger spectral overlap integral with respect to the solar spectru
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