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Diketopyrrolopyrrole-based Small Molecules with Simple Structure for High VOC Organic Photovoltaics

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Authors

이종원; 최윤석

Issue Date
2012-10-12
Publisher
한국고분자학회
Citation
2012년도 한국고분자학회 추계 정기총회 및 연구논문발표회, 2012. 10. 11 - 10. 12, 창원컨벤션센터
Keywords
공학
Abstract
In developing new conjugated organic materials for BHJ solar cells, a well-known
architecture, alternatively composed of weak electron-donating and strong electron-accepting
units, has been utilized to manipulate their electronic properties for high V oc. In this study, we
have postulated that the introduction of electron-donating units with different aromatic
resonance stabilization energy into the A-D-A type small molecule (SM), where A is
thiophene-capped diketoppyrolopyrrole (TDPP) and D is an electron-donating unit such as
thiophene (T) and phenylene (Ph), would precisely control the HOMO energy levels of the
SMs for efficient OPVs. For this approach to be realized, a series of TDPP-based SMs,
(TDPPh, T(TDPPh, and Ph(TDPPh, were synthesized. As expected, the HOMO energy
level of T(TDPPh ( -5.17 eV) is slightly higher than that of (TDPP)2 ( -5.19 eV) due to a
strong electron-donating thiophene bridge, while the HOMO energy level of Ph(TDPP)2
(-5.28 eV) is deeper than that of (TDPP)z due to the introduction of weak electron-donating
phenylene bridge between two TDPPs. Consequently, the solar cell based on Ph(TDPP)2
achieved a PCE of 4.01% with high Voc of0.93 V.
Language
English
URI
https://hdl.handle.net/10371/81612
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