Synthesis and Characterization of New Nonfullerene Electron Acceptors for Organic Photovoltaics
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초록
내용
Recently, non-fullerene acceptors have attracted significant attention for organic photovoltaics (OPVs) exhibiting well-aligned energy levels, complementary absorption and appropriate morphology with donors. However, most of the high performance non-fullerene acceptors are based on linear structure containing rigid electron donating core and two electron deficient end-capping groups. Although the 2-dimentional (2D) star-shaped molecule has potential to exhibit good efficiency in solar cells, such as improved molar absorption coefficient and face-on oriented columnar packing structures enhancing charge mobility in a vertical direction, little studies have been done. In this study, two triazine-based n-type 2D star-shaped molecules were designed and synthesized. The structural planarity of the materials induced the molecular orientation to be face-on in the bulk. With this characteristics, it has been applied as an n-type active layer material for OPVs and will be presented in detail.