Johannes Benduhn

Modern image sensors necessitate three color‐selective photodetectors: red, green, and blue (RGB) sensing units. Among those, blue light‐specific photodetectors are comparably much less reported. Here, a fully thermal‐evaporated organic photodetector (OPD) with narrowband blue detection based on exploring the dual role of the hole‐transporting layer is elegantly demonstrated. By incorporating a MoO 3 ‐doped underlayer, the narrowband OPD achieves high external quantum efficiency up to 50% at 0 V with thin‐film devices. By adopting an intrinsic underlayer in planar junction configuration along with efficient hole and electron blocking layers, an ultralow dark current (2.46 × 10 −12 A cm −2 at −0.1 V) is achieved. The device has a calculated specific detectivity ( D * ) reaching a record‐high value of 6.35 × 10 14 Jones, outperforming commercial silicon photodetectors, and an ultrahigh linear dynamic range of 205 dB. This work paves the way for high‐sensitivity narrowband organic photodetectors in the visible spectral region.