Random copolymerization of polythiophene for simultaneous enhancement of in-plane and out-of-plane charge transport for organic transistors and perovskite solar cells
- Authors
- Ko, Seong Yeon; Nketia-Yawson, Benjamin; Ahn, Hyungju; Jo, Jea Woong; Ko, Min Jae
- Issue Date
- Apr-2021
- Publisher
- WILEY
- Keywords
- charge-transport anisotropy; conjugated polymer; organic field-effect transistors; perovskite photovoltaics; polythiophene; random polymerization
- Citation
- INTERNATIONAL JOURNAL OF ENERGY RESEARCH, v.45, no.5, pp.7998 - 8007
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF ENERGY RESEARCH
- Volume
- 45
- Number
- 5
- Start Page
- 7998
- End Page
- 8007
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1305
- DOI
- 10.1002/er.6293
- ISSN
- 0363-907X
- Abstract
- High-performance conjugated polymers for electronic applications can be developed by modulating an appropriate chemical structure that optimizes their crystal characteristics and charge-transport behavior. Herein, we demonstrated the simultaneous enhancement of the in-plane and out-of-plane charge transport of polythiophenes by random polymerization. We synthesized a polythiophene polymer by varying the ratio of two different dialkyl-substituted bi-thiophene and triethylene glycol-substituted mono-thiophene units; this polymer exhibited weakened orientation preferences of polymer crystallite films, a denser packing, and a more homogeneous surface morphology in comparison with its homopolymer analogue. Furthermore, this optimized random polymer afforded an enhanced in-plane mobility of 7.72 cm(2) V-1 second(-1), measured by field-effect transistor, and out-of-plane mobility of 8.86 x 10(-4) cm(2) V-1 second(-1), measured by space-charge-limited-current device. These are respectively 2.4 times and 10 times higher than the mobilities of the homopolymer (field-effect mobility = 3.25 cm(2) V-1 second(-1) and space-charge-limited-current mobility = 8.73 x 10(-5) cm(2) V-1 second(-1)). The enhanced charge transport in out-of-plane direction was also confirmed by fabricating perovskite solar cells using optimized polythiophene as a hole-transporting material, which exhibited a higher efficiency of nearly 16.2% than the device with homopolymer analogue (12.0%).
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