POS5-0915
Systematic Cyano-Substitution Engineering of Dithienopyrrole-Based Non-Fullerene Acceptors for Near-Infrared Organic Photodetectors
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Wonseok Choi (KRICT)
Co-Author(s)
Abstract
Non-fullerene acceptors (NFAs) have attracted considerable attention as next-generation organic optoelectronic materials owing to their tunable absorption characteristics and capability for selective photoresponse, making them promising candidates for near-infrared (NIR) organic photodetectors (OPDs). However, the limited absorption of conventional NFAs in the NIR region remains a major challenge for extending the photodetection range. In particular, end-group engineering of NFAs has predominantly relied on halogen substitution strategies, such as fluorination and chlorination, which provide limited improvement in long-wavelength photoresponse. To address this challenge, cyano (CN) substituents, possessing stronger electron-withdrawing characteristics than conventional halogen substituents, were introduced into dithienopyrrole (DTP)-based NFAs. The incorporation of CN groups is expected to effectively modulate the molecular energy levels, enhance intramolecular charge transfer, and extend light absorption toward longer wavelengths. Furthermore, the effects of the number of CN substituents on the optoelectronic properties of NFAs and the performance of organic photodetector devices were systematically investigated. This study aims to provide fundamental insights into CN-based end-group engineering and establish molecular design guidelines for the development of high-performance NFA materials for NIR photodetection.
