Effect of Cyano Substitution on Non‐Fullerene Acceptor for Near‐Infrared Organic Photodetectors above 1000 nm (Adv. Funct. Mater. 8/2023)

Non-Fullerene Acceptors In article number 2211486, Seo-Jin Ko, Jong H. Kim, Sung Cheol Yoon, and co-workers present a new CN-substituted non-fullerene acceptor COTCN2, which exhibits a deeper highest occupied molecular orbital energy level and a narrower optical bandgap (< 1.10 eV). As a result, the near-infrared organic photodetector (NIR OPD) based on PTB7-Th:COTCN2 provides high non-detectability beyond 1000 nm with dark hole injection well suppressed due to the larger charge injection barrier. Additionally, as a practical implementation of NIR OPD, photoplethysmography sensors are successfully demonstrated.