Synthesis and characterization of wide range light absorbing poly(dithieno[3,2-b:2 ',3 '-d]thiophene-alt-3,6-bis(thiophen-2-yl)-2,5-di-n-octyl-pyrrolo[3,4-c]pyrrole-1,4-dione) for polymer solar cells
- Author(s)
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Lee, Chun-Young, Kim, BongSoo, Kim, Kyung Hwan, Yoon, Youngwoon, Lee, Min Woo, Choi, Dong Hoon, Ko, Min Jae, Kim, Honggon, Lee, Doh-Kwon, Kim, Kyungkon
- Issued Date
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2013-01
- DOI
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10.1016/j.synthmet.2012.12.028
- URI
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https://scholarworks.unist.ac.kr/handle/201301/24842
- Fulltext
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https://www.sciencedirect.com/science/article/pii/S0379677912004468?via%3Dihub
- Citation
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SYNTHETIC METALS, v.164, pp.64 - 68
- Abstract
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We designed and synthesized a new low band gap donor-acceptor copolymer (PDTDPP-Oct) composed of alternating dithieno[3,2-b:2',3'-d]thiophene and bis-thienyl-diketopyrrolo[3,4-c]pyrrole units. The polymer films showed a very broad absorption band that extended up to 950 nm. Thermogravimetric analysis revealed good thermal stability and a high glass transition temperature of 128 C. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the polymer were estimated to be -5.01 and -3.70 eV, respectively. Bulk heterojunction polymer solar cells were fabricated with the structure: ITO/PEDOT:PSS/polymer:PCBM/Al. The introduction of 1,8-octanedithiol as a processing additive to the polymer/PCBM blend solution significantly improved the device performance relative to devices prepared from the blend solution without the additive. This cell gave a short circuit current of -1.8 mA/cm(2), an open circuit voltage of 0.60 V, and a fill factor of 0.52, yielding a power conversion efficiency of 0.55%. The performance improvements were mainly attributed to the fine morphology of the blend film.
- Publisher
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ELSEVIER SCIENCE SA
- ISSN
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0379-6779
- Keyword (Author)
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Polymer solar cells, Power conversion efficiency, Low band gap polymer, Morphology, Wide range light absorption
- Keyword
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FIELD-EFFECT TRANSISTORS, THIN-FILM TRANSISTORS, BAND-GAP POLYMERS, PHOTOVOLTAIC APPLICATIONS, EFFICIENCY, MOBILITY, BLENDS, PERFORMANCE, COPOLYMERS, TRANSPORT
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