Yun, Jae Hoon Ahn, Hyungju Lee, Phillip Ko, Min Jae Son, Hae Jung 2024-01-20T00:30:49Z 2024-01-20T00:30:49Z 2021-09-03 2017-10-10 0024-9297 https://pubs.kist.re.kr/handle/201004/122180 We developed donor acceptor (D-A)-type random polymers based on 3,3'-difluoro-2,2'-bithiophene with various relative amounts of 5,6-difluoro-4,7-bis(5-bromo-(2-decyltetradecyl)thiophen-2-y1)-2,1,3-benzothiadiazole (2FBT) and 5,6-difluoro-4,7-bis(5-bromo-(2-octyldodecyl) thiophen-2-y1)-2- (3,4-dichlorobenzyloxybutyl)-2H-benzo [d][1,2,3]triazole (DCB-2FBTZ). Introducing small relative amounts of DCB-2FBTZ into the polymer was found to effectively enhance its solar cell performance, resulting in a power conversion efficiency of 9.02%, greater than the 7.29% that resulted from the PFBT-FTh copolymer. Moreover, when the active area of the BHJ film was increased to 1 cm(2), the solar cell reproducibly showed a high performance, here with an efficiency of 8.01% even when the thickness of the active layer was 313 nm. Our studies revealed that including the DCB-2FBTZ group in the polymer simultaneously improved the solution processability and crystallinity of the polymer. These improvements resulted in the formation of highly homogeneous BHJ films throughout large areas with only minor amounts of defects resulting from overaggregation and hence with appropriate morphologies for effective charge generation and transport. English AMER CHEMICAL SOC CONJUGATED POLYMERS CHARGE-TRANSPORT HIGH-EFFICIENCY ELECTRODES COPOLYMERS SEMICONDUCTOR TRANSISTORS AGGREGATION MORPHOLOGY MOBILITY Development of Highly Crystalline Donor-Acceptor-Type Random Polymers for High Performance Large-Area Organic Solar Cells Article 10.1021/acs.macromol.7b01613 1 MACROMOLECULES, v.50, no.19, pp.7567 - 7576 MACROMOLECULES 50 19 7567 7576 scie scopus 000412965900016 2-s2.0-85031013879 Polymer Science Polymer Science Article CONJUGATED POLYMERS CHARGE-TRANSPORT HIGH-EFFICIENCY ELECTRODES COPOLYMERS SEMICONDUCTOR TRANSISTORS AGGREGATION MORPHOLOGY MOBILITY solar cell polymer