Synthesis of organic semiconductor bearing B←N bridged thienylthiazole and diketopyrrolopyrrole for the applicaton of high open-circuit voltage organic photovoltaics

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Title
Synthesis of organic semiconductor bearing B←N bridged thienylthiazole and diketopyrrolopyrrole for the applicaton of high open-circuit voltage organic photovoltaics
Author(s)
Ka Yeon Ryu; Dan-Bi Sung; Suk-Young Won; Ara Jo; Kyusang Ahn; Hyun Yeong Kim; Arulraj Arulkashmir; Kyungwon Kwak; Chongmok Lee; Won-Suk Kim; Kyungkon Kim
Publication Date
2018-02
Journal
DYES AND PIGMENTS, v.149, no., pp.858 - 866
Publisher
ELSEVIER SCI LTD
Abstract
New small molecular semiconductors with small band gap and low-lying highest occupied molecular orbital (EHOMO), namely TBDPPOT, TBDPPEH, and TBDPPEHT4 were synthesized by incorporating the B←N bridged thienylthiazole and diketopyrrolopyrrole (DPP) derivatives. TBDPPOT and TBDPPEH were prepared, respectively, using two different DPPs having 1-octyl and 2-ethylhexyl moiety as the solubilizing group. In addition, the band gap of the TBDPPEH is further reduced by introducing planar thienothiophene unit, which was used for the preparation of TBDPPEHT4. These synthesized SMs are blended with fullerene derivative to construct a photo-active layer for organic photovoltaics. Among OPVs utilizing those SMs, the TBDPPEH exhibits highest power conversion efficiency of 3.21% with an exceptionally high VOC of 0.92 V, which is ascribed to low-lying HOMO energy level of −5.62 eV. It is expected that the utilization of TBDPPEH as a photo-active layer for OPVs would enhance the oxidation stability of the OPVs. © 2017 Elsevier Ltd. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/4156
ISSN
0143-7208
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
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