0476277 - ÚMCH 2018 RIV NL eng J - Článek v odborném periodiku
Xu, S. - Feng, L. - Yuan, J. - Cimrová, Věra - Chen, G. - Zhang, Z.-G. - Li, Y. - Peng, H. - Zou, Y.
New m-alkoxy-p-fluorophenyl difluoroquinoxaline based polymers in efficient fullerene solar cells with high fill factor.
Organic Electronics. Roč. 50, November (2017), s. 7-15. ISSN 1566-1199. E-ISSN 1878-5530
Grant CEP: GA ČR(CZ) GA13-26542S
Institucionální podpora: RVO:61389013
Klíčová slova: quinoxaline * D-A copolymer * fullerene solar cells
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.680, rok: 2017

Two new donor (D) - acceptor (A) copolymers, named m-O-p-F-DFQx-BDT (OFQx-T) and m-EH-p-F-DFQx-BDT (EHFQx-T), which were based on meta-octyloxy-para-fluorophenyl and meta-ethylhexyloxy-para-fluorophenyl difluoroquinoxaline as acceptor units (O-DFQx/EH-DFQx) and alkylthienyl substituted benzodithiophene (BDT) as a donor unit, were designed and synthesized. EHFQx-T had higher absorption coefficient than OFQx-T which contributed to larger short-circuit current density (Jsc). EHFQx-T showed a lower the highest occupied molecular orbital (HOMO) which is beneficial for the voltage open-circuit (Voc). The polymer solar cells (PSCs) based OFQx-T:PC71BM and EHFQx-T:PC71BM blended film as active layer showed high power conversion efficiency (PCE) of 7.60% and 8.44%, respectively, with 1,8-diiodooctane (DIO) solvent additive treatment. More importantly, OFQx-T:PC71BM and EHFQx-T:PC71BM had good fill factor (FF), especially the FF of OFQx-T:PC71BM was over 70%. The high FF contributed to obtain high PCEs for OFQx-T and EHFQx-T. The more balanced and higher charge mobility, smaller geminate recombination and suitable nanoscale phase separation size of EHFQx-T demonstrate that changing octyl chain to ethylhexyl chain in DFQx acceptor unit is efficient to improve photovoltaic properties in fullerene solar cells.
Trvalý link: http://hdl.handle.net/11104/0273170