High‐Detectivity Green‐Selective All‐Polymer p–n Junction Photodetectors
Jinhyeon Kang, Junho Kim, Hyobin Ham, Hyungju Ahn, Soo Yeong Lim, Hyung Min Kim, In‐Nam Kang, In Hwan Jung
Abstract
Abstract Currently available wavelength‐selective p–n junction organic photodetectors (OPDs) nearly exclusively use small molecules. In this study, green (G) selective all‐polymer p–n junction OPDs are developed by engineering the π‐conjugation networks and insulating properties of p‐ and n‐type polymers. Enhanced intermolecular ordering of p–n junction blend films compared to pristine polymer films results in superior hole/electron mobilities and low bimolecular recombination in the devices. Notably, similar G absorption ranges and the huge difference in their absorption coefficients between p‐ and n‐type polymers make excellent G selectivity in the p–n junction OPDs. Thus, narrow selectivity with a full width at half maximum of 155 nm toward green light and high detectivity of ≈10 13 Jones are achieved in the all‐polymer p–n junction OPDs.