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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Benzodithiophene-thiophene-based photovoltaic polymers with different side-chains

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Title
Benzodithiophene-thiophene-based photovoltaic polymers with different side-chains
Author
Nguyen, Thanh LuanSong, SeyeongKo, Seo-JinChoi, HyosungJeong, Ji-EunKim, TaehyoHwang, SunguKim, Jin YoungWoo, Han Young
Issue Date
2015-04
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.53, no.7, pp.854 - 862
Abstract
A series of benzodithiophene-thiophene-based alternating copolymers were synthesized with different side-chains, and their photovoltaic characteristics were examined. The choice of solubilizing side-chains influences significantly the chain conformation, frontier orbital energy levels, intermolecular organization, and the resulting optical, morphological, and photovoltaic properties. The incorporation of an e-withdrawing carbonyl group in the side-chain decreased the highest occupied molecular orbital (HOMO, ca. -5.4 eV) level and improved the chain planarity through intrachain hydrogen bonding. The shortest π-π stacking distance (3.72 Å) was also measured for the alkylcarbonyl-substituted BDTCOT:PC71BM blended film by two dimensional grazing incidence X-ray scattering. With compared to other polymers, the BDTCOT:PC71BM device showed a substantially improved open-circuit voltage and short-circuit current density, leading to a 4.66% power conversion efficiency. The side-chains need to be designed to be multifunctional to induce a deep HOMO level and chain planarity (for interchain ordering) as well as good solution processability
URI
https://scholarworks.unist.ac.kr/handle/201301/10984
URL
http://onlinelibrary.wiley.com/doi/10.1002/pola.27516/abstract;jsessionid=A673BCBD4AFAC00B21F93D116A2107BF.f02t04
DOI
10.1002/pola.27516
ISSN
0887-624X
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