Thiazolothiazole Donor-Acceptor Conjugated Polymer Semiconductors for Photovoltaic Applications
- Authors
- Subramaniyan, Selvam; Xin, Hao; Kim, Felix Sunjoo; Murari, Nishit M.; Courtright, Brett A. E.; Jenekhe, Samson A.
- Issue Date
- Jul-2014
- Publisher
- AMER CHEMICAL SOC
- Citation
- MACROMOLECULES, v.47, no.13, pp 4199 - 4209
- Pages
- 11
- Journal Title
- MACROMOLECULES
- Volume
- 47
- Number
- 13
- Start Page
- 4199
- End Page
- 4209
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/36928
- DOI
- 10.1021/ma500250j
- ISSN
- 0024-9297
1520-5835
- Abstract
- A series of eight new donor-acceptor conjugated copolymers based on thiazolo[5,4-d]thiazole (TT) were synthesized by Suzuki and Stile polycondensations, and their optical, electronic structure, field-effect charge transport, and photovoltaic properties were investigated. The number-average molecular weight was moderate to high (20-103 kDa) for four of the new copolymers and low (<10 kDa) for the rest. The optical band gap (1.7-2.2 eV) and the ionization potential (4.9-5.7 eV) of the copolymers could be tuned by varying the strength of the electron-donating comonomers. X-ray diffraction analysis of the neat TT polymer thin films showed that they exhibit a lamellar crystalline morphology with a (100) d-spacing of 1.449-1.881 nm. The polymers had field-effect hole mobilities of 2 X 10(-3)-3 X 10(-2) cm(2)/(V s). Although fullerene (PC71BM)-based bulk heterojunction solar cells showed that most of the new polymers had low photovoltaic power conversion efficiency (<2.4%), the standout polymer PDEHTT had a high efficiency of 5.7%. X-ray diffraction analysis and TEM imaging of PDEHTT/PC71BM blend films showed a bicontinuous nanoscale morphology with a crystalline polymer nanofiber (15-20 nm width) network.
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