Jo, Jea Woong Jung, Jae Woong Ahn, Hyungju Ko, Min Jae Jen, Alex K. -Y. Son, Hae Jung 2024-01-20T02:32:43Z 2024-01-20T02:32:43Z 2021-09-05 2017-01 1614-6832 https://pubs.kist.re.kr/handle/201004/123266 All-polymer solar cells (all-PSCs) utilizing p-type polymers as electron-donors and n -typepolymers as electron-acceptors have attracted a great deal of attention, and their efficiencies have been improved considerably. Here, five polymer donors with different molecular orientations are synthesized by random copolymerization of 5-fluoro-2,1,3-benzothiadiazole with different relative amounts of 2,2'-bithiophene (2T) and dithieno[3,2-b;2',3'-d]thiophene (DTT). Solar cells are prepared by blending the polymer donors with a naphthalene diimide-based polymer acceptor (PNDI) or a [6,6]-phenyl C-71-butyric acid methyl ester (PC71BM) acceptor and their morphologies and crystallinity as well as optoelectronic, charge-transport and photovoltaic properties are studied. Interestingly, charge generation in the solar cells is found to show higher dependence on the crystal orientation of the donor polymer for the PNDI-based all-PSCs than for the conventional PC71BM-based PSCs. As the population of face-on-oriented crystallites of the donor increased in PNDI-based PSC, the short-circuit current density (J(SC)) and external quantum efficiency of the devices are found to significantly improve. Consequently, device efficiency was enhanced of all-PSC from 3.11% to 6.01%. The study reveals that producing the same crystal orientation between the polymer donor and acceptor (face-on/face-on) is important in all-PSCs because they provide efficient charge transfer at the donor/acceptor interface. English WILEY-V C H VERLAG GMBH POWER CONVERSION EFFICIENCY CONJUGATED POLYMERS NON-FULLERENE ORGANIC PHOTOVOLTAICS SIDE-CHAINS PHOTOCURRENT GENERATION ELECTRON-ACCEPTOR BLEND MORPHOLOGY PERFORMANCE AGGREGATION Effect of Molecular Orientation of Donor Polymers on Charge Generation and Photovoltaic Properties in Bulk Heterojunction All-Polymer Solar Cells Article 10.1002/aenm.201601365 1 ADVANCED ENERGY MATERIALS, v.7, no.1 ADVANCED ENERGY MATERIALS 7 1 scie scopus 000393583600014 2-s2.0-84997834602 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Energy & Fuels Materials Science Physics Article POWER CONVERSION EFFICIENCY CONJUGATED POLYMERS NON-FULLERENE ORGANIC PHOTOVOLTAICS SIDE-CHAINS PHOTOCURRENT GENERATION ELECTRON-ACCEPTOR BLEND MORPHOLOGY PERFORMANCE AGGREGATION conjugated polymers copolymers molecular orientation nonfullerene acceptors polymer solar cells