The Polymer Society of Korea

이준환 (충남대학교)

이재원 (충남대학교)

Short-wavelength infrared (SWIR) organic photodetectors (OPDs) have attracted increasing attention across a broad range of technological applications, including image sensing, biomedical imaging, and optical communication systems. As the photoresponse of OPDs is extended toward longer wavelengths, their functional scope continues to expand. Despite this progress, non-fullerene acceptors (NFAs) capable of exhibiting efficient photoresponse beyond 1200 nm remain relatively limited. To address this challenge and enhance molecular charge transfer characteristics, we have developed a series of novel materials based on an acceptor–donor–acceptor–donor–acceptor (A–D-A'–D-A) molecular architecture. By systematically modifying the functional groups of the core acceptor unit, the resulting materials exhibit significantly reduced optical bandgaps (Eg), reaching values below 1.0 eV, thereby enabling extended SWIR photoresponse.