Stable Unencapsulated Near‐Infrared Organic Photodetectors

Abstract Stability is crucial for the practical applications of organic photodetectors (OPDs). In this work, it is reported that near‐infrared (NIR) OPDs without device encapsulation can exhibit excellent stability at ambient conditions. The unencapsulated OPDs exhibit a T 90 lifetime, which is defined as the time required for responsivity to decay to 90% of its initial value, exceeding 1000 h at ambient conditions under 600 lux light irradiation. The device stability is attributed to the all‐fused‐ring skeleton of the acceptor in the active layer and the hydrophobicity of the crosslinked organic cathode interlayer. In addition, the OPDs exhibit a specific detectivity of 1.65 × 10 13 Jones at 920 nm at −0.1 V bias, which is among the highest reported so far for NIR OPDs. This work demonstrates the promising future of NIR OPDs for practical applications.