Park, Sungmin Seo, Dongkyun Ryu, Tae In Ahn, Gukil Kwak, Kyungwon Kim, Hyunjung Cheon, Cheol Hong Park, Nam-Gyu Kim, BongSoo Ko, Min Jae Lee, Doh-Kwon Kim, Jin Young Kim, Honggon Son, Hae Jung 2024-01-20T08:01:06Z 2024-01-20T08:01:06Z 2021-09-05 2015-01-27 0024-9297 https://pubs.kist.re.kr/handle/201004/125850 We present controls of nanomorphology of polymer:fullerene BHJ films via synthesis of a series of pushpull-type copolymers with various molar percentages of side chains terminated with o-dichlorobenzyl (DCBZ) groups. As the molar percentage of the DCBZ-containing repeat units increases, the miscibility of the polymers in the series with PC71BM increases with respect to that of the polymer (PTBBO) that does not contain DCBZ. In the optimal film morphology, which consists of a polymer containing 25 mol % DCBZ-terminated side chains in the electron-pull unit (PTBDCB25), the polymer/PC71BM interface area is sufficiently large for efficient charge separation and percolated pathways is present for efficient charge carrier transport. In contrast, the BHJ film prepared from PTBBO has smaller interfaces and larger PC71BM aggregates. Furthermore, the intermolecular interaction between PC71BM and DCBZ induced changes in the PC71BMs electronic structure at the polymer:PC71BM interface, resulting in an increase of the PC71BMs LUMO level and thereby the improved open-circuit voltage. As a result, the BHJ solar cell device fabricated with PTBDCB25 exhibits significantly improved performance with a PCE of 8.30%, whereas the PCE of PTBBO is 6.90%. English AMER CHEMICAL SOC HETEROJUNCTION SOLAR-CELLS OPEN-CIRCUIT VOLTAGE PERFORMANCE MORPHOLOGY COPOLYMER BLENDS POLY(3-HEXYLTHIOPHENE) SOLUBILITY ORIGIN Enhancement of Organic Photovoltaic Efficiency via Nanomorphology Control using Conjugated Polymers Incorporating Fullerene Compatible Side-Chains Article 10.1021/ma502546b 1 MACROMOLECULES, v.48, no.2, pp.337 - 345 MACROMOLECULES 48 2 337 345 scie scopus 000348619200005 2-s2.0-84921800858 Polymer Science Polymer Science Article HETEROJUNCTION SOLAR-CELLS OPEN-CIRCUIT VOLTAGE PERFORMANCE MORPHOLOGY COPOLYMER BLENDS POLY(3-HEXYLTHIOPHENE) SOLUBILITY ORIGIN organic solar cell conjugated polymer