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Significant light absorption enhancement by a single heterocyclic unit change in the pi-bridge moiety from thieno[3,2-b]benzothiophene to thieno[3,2-b]indole for high performance dye-sensitized and tandem solar cells

Authors
Eom, Yu KyungKang, Sung HoChoi, In TaekYoo, YoungjunKim, JeonghoKim, Hwan Kyu
Issue Date
7-2월-2017
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.5, no.5, pp.2297 - 2308
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS CHEMISTRY A
Volume
5
Number
5
Start Page
2297
End Page
2308
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/84461
DOI
10.1039/c6ta09836c
ISSN
2050-7488
Abstract
The molecular design of organic sensitizers is one of the fundamental factors for high-efficiency dye-sensitized solar cells (DSSCs). In this study, we first utilize the alkylated thieno[3,2-b]indole (TI) moiety as the pi-bridge unit to enhance the pi-bridge capability of the thieno[3,2-b]benzothiophene (TBT) used in organic sensitizers. To improve the spectral response of the SGT-130 reference dye, we strategically designed and synthesized two novel TI-based organic sensitizers, SGT-136 and SGT-137, through a simple change of the pi-bridge unit. By replacing the TBT with the alkylated TI moiety, SGT-136 and SGT-137 could have a red-shifted absorption band and upshifted highest occupied molecular orbital (HOMO) energy level. As a result, the SGT-137-based DSSC exhibits a higher PCE (12.45%) than that based on SGT-130 (9.83%) owing to the improvement of current density and retardation of charge recombination by the hexyl substituted TI unit. These results indicate that the TI moiety is a good candidate for remarkable pi-electronic mediators in D-pi-A organic sensitizers with the characteristic of facile synthesis compared to other complicated pi-bridges. Furthermore, the parallel-connected tandem device with SGT-137 and SGT-021 porphyrin-based DSSCs shows a significantly improved current density (22.06 mA cm(-2)) and PCE (14.64%), which is the highest value reported for organic-based tandem solar cells to date.
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