122nd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation for Young Polymer Scientists
Room No. Room 325C+D
Time THU 09:00-:
Code POLY.O-1
Subject Fluorine-Driven Self-Assembled Polymer Acceptor for Highly Efficient and Flexible All-Polymer Solar Cells
Authors Minjun Kim, Guan-Woo Kim1, Taewan Kim1, Junwoo Lee1, Taiho Park1,*
Chemical engineering, Pohang University of Science and Technology, Korea
1Department of Chemical Engineering, Pohang University of Science and Technology, Korea
Abstract In this study, a copolymer of naphthalene diimide (NDI) and (E)-1,2-bis(3-fluorothiphen-2-yl)ethene (FTVT) (PNDI-FTVT), which has a low-crystalline structure and high electron mobility, was used as a polymer acceptor. The blend film using PNDI-FTVT exhibited a well-mixed morphology without a large-scale phase separation due to reduced crystalline domain size. In addition, PNDI-FTVT increases intermolecular interactions with the polymer donor by fluorine-driven strong π–π stacking, thereby improving the chain interconnectivity to construct a better charge carrier transport pathway and enhance mechanical resilience in flexible all-polymer solar cells (all-PSCs). PNDI-FTVT based flexible all-PSCs exhibit improved photovoltaic performance compared to PNDI-TVT based flexible all-PSCs (3.86% → 5.90%) as well as excellent mechanical stability, maintaining 72% of its initial performance (5.90% → 4.26%). To the best of our knowledge, this is the highest photovoltaic performance for spin-coated flexible all-PSCs and the first report on photovoltaic operation in the bending test.
E-mail koh851116@postech.ac.kr