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 2024-01-20T13:03:34Z 2024-01-20T13:03:34Z 2021-09-01 2013-01-15 0379-6779 https://pubs.kist.re.kr/handle/201004/128449 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. (c) 2013 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA FIELD-EFFECT TRANSISTORS THIN-FILM TRANSISTORS BAND-GAP POLYMERS PHOTOVOLTAIC APPLICATIONS EFFICIENCY MOBILITY BLENDS PERFORMANCE COPOLYMERS TRANSPORT 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]py rrole-1,4-dione) for polymer solar cells Article 10.1016/j.synthmet.2012.12.028 1 SYNTHETIC METALS, v.164, pp.64 - 68 SYNTHETIC METALS 164 64 68 scie scopus 000316525900014 2-s2.0-84872981149 Materials Science, Multidisciplinary Physics, Condensed Matter Polymer Science Materials Science Physics Polymer Science Article FIELD-EFFECT TRANSISTORS THIN-FILM TRANSISTORS BAND-GAP POLYMERS PHOTOVOLTAIC APPLICATIONS EFFICIENCY MOBILITY BLENDS PERFORMANCE COPOLYMERS TRANSPORT Polymer solar cells Power conversion efficiency Low band gap polymer Morphology Wide range light absorption