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양창덕

Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab.
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Overcoming Fill Factor Reduction in Ternary Polymer Solar Cells by Matching the Highest Occupied Molecular Orbital Energy Levels of Donor Polymers

Author(s)
Lee, JihoonTamilavan, VellaiappillaiRho, Kyung HwanKeum, SanghaPark, Ki HongHan, DaheeJung, Yun KyungYang, ChangdukJin, YoungeupJang, Jae-WonJeong, Jung HyunPark, Sung Heum
Issued Date
2018-03
DOI
10.1002/aenm.201702251
URI
https://scholarworks.unist.ac.kr/handle/201301/23155
Fulltext
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201702251/abstract
Citation
ADVANCED ENERGY MATERIALS, v.8, no.9, pp.1702251
Abstract
Despite the potential of ternary polymer solar cells (PSCs) to improve photocurrents, ternary architecture is not widely utilized for PSCs because its application has been shown to reduce fill factor (FF). In this paper, a novel technique is reported for achieving highly efficient ternary PSCs without this characteristic sharp decrease in FF by matching the highest occupied molecular orbital (HOMO) energy levels of two donor polymers. Our ternary device-made from a blend of wide-bandgap poly[4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b']dithiophene-alt-2,5-dioctyl-4,6-di(thiophen-2-yl)pyrrolo[3,4c]pyrrole-1,3(2H,5H)-dione) (PBDT-DPPD) polymer, narrow-bandgap poly[4,8-bis[5-(2-ethylhexyl)-2-thienyl]benzo[1,2-b:4,5-b']dithiophene-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] (PTB7-Th) polymer, and [6,6]-phenyl C-70-butyric acid methyl ester (PC70BM)-exhibits a maximum power conversion efficiency of 10.42% with an open-circuit voltage of 0.80 V, a short-circuit current of 17.61 mA cm(-2), and an FF of 0.74. In addition, this concept is extended to quaternary PSCs made by using three different donor polymers with similar HOMO levels. Interestingly, the quaternary PSCs also yield a good FF (approximate to 0.70)-similar to those of corresponding binary PSCs. This study confirms that the HOMO levels of the polymers used on the photoactive layer of PSCs are a crucial determinant of a high FF.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1614-6832
Keyword (Author)
efficient charge transporthigh fill factorternary polymer solar cells
Keyword
POWER CONVERSION EFFICIENCYOPEN-CIRCUIT VOLTAGEBAND-GAP POLYMERHIGH-PERFORMANCE11-PERCENT EFFICIENCYEXCEEDING 11-PERCENTPHOTOVOLTAIC CELLSBLENDACCEPTORMORPHOLOGY

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