Thieno[3,2-b][1]benzothiophene Derivative as a New pi-Bridge Unit in D-pi-A Structural Organic Sensitizers with Over 10.47% Efficiency for Dye-Sensitized Solar Cells
- Authors
- Eom, Yu Kyung; Choi, In Taek; Kang, Sung Ho; Lee, Joori; Kim, Jeongho; Ju, Myung Jong; Kim, Hwan Kyu
- Issue Date
- 5-8월-2015
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- cobalt redox couple; dye-sensitized solar cells; fused-ring building block; metal-free organic sensitizers; -bridge unit
- Citation
- ADVANCED ENERGY MATERIALS, v.5, no.15
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED ENERGY MATERIALS
- Volume
- 5
- Number
- 15
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92778
- DOI
- 10.1002/aenm.201500300
- ISSN
- 1614-6832
- Abstract
- Three new thieno[3,2-b][1]benzothiophene (TBT)-based donor-pi-acceptor (D-pi-A) sensitizers, coded as SGT-121, SGT-129, and SGT-130, have been designed and synthesized for dye-sensitized solar cells (DSSCs), for the first time. The TBT, prepared by fusing thiophene unit with the phenyl unit of triphenylamine donor, is utilized as the pi-bridge for all sensitizers with good planarity. They have been molecularly engineered to regulate the highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy levels and extend absorption range as well as to control the electron-transfer process that can ensure efficient dye regeneration and prevent undesired electron recombination. The photovoltaic performance of SGT-sensitizer-based DSSCs employing Co(bpy)(3)(2+/3+) (bpy = 2,2-bipyridine) redox couple is systematically evaluated in a thorough comparison with Y123 as a reference sensitizer. Among them, SGT-130 with benzothiadiazole-phenyl (BTD-P) unit as an auxiliary acceptor exhibits the highest power-conversion efficiency (PCE) of 10.47% with J(sc) = 16.77 mA cm(-2), V-oc = 851 mV, and FF = 73.34%, whose PCE is much higher than that of Y123 (9.5%). It is demonstrated that the molecular combination of each fragment in D-pi-A organic sensitizers can be a pivotal factor for achieving the higher PCEs and an innovative strategy for strengthening the drawbacks of the pi-bridge.
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Collections - Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles
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