Ultra-Sensitive Short-Wave Infrared Organic Photodetectors Enabled by a Proquinoid Electron Acceptor
발표자
박세정 (한국화학연구원)
연구책임자
고서진 (DGIST)
이보람 (성균관대학교)
초록
내용
Achieving high-performance organic SWIR photodetectors (SWIR OPDs) remains challenging due to intrisically weak photoresponse and sensitivity. Herein, we report a novel proquinoid-type non-fullerene acceptor (NFA), denoted as TQC-4Cl, featuring an ultra-narrow band gap of 1.01 eV and a broad spectral response extending beyond 1200 nm, enabled via an aromatic-quinoid transformation strategy. Thermal annealing of the TQC-4Cl film significantly enhances its crystallinity and molecular ordering. Consequently, the optimized TQC-4Cl-based SWIR OPDs exhibit an exceptionally low dark current density (Jd) of 4.38×10-8 A cm-2 at -0.5 V bias and a high external quantum efficiency (EQE) of 13.66 % at 1200 nm, resulting in a sho-noise limited specific detectivity (Dsh*) of 1.06×1012 Jones under the same bias condition.