POS5-0778
Fast-Response 1310 nm Photomultiplication Organic Photodetectors via Perovskite Quantum Dot Interlayer Engineering
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Minyoung Jeong (POSTECH)
Co-Author(s)
Abstract
Photomultiplication-type organic photodetectors (PM-OPDs) operating at optical communication wavelengths remain challenging because conventional PM mechanisms rely on trap-rich active layers, limiting both long-wavelength operation and response speed. Herein, we report a short-wavelength infrared (SWIR) PM-OPD employing a perovskite quantum dot (PQD) interlayer to induce PM while preserving the intrinsic absorption of a low-bandgap donor–acceptor bulk heterojunction. A nonfullerene acceptor exhibiting photoresponse beyond 1300 nm was utilized as the active layer, while CsPbI3 and CsPbBr3 PQDs were introduced as PM-inducing interlayers. The PQD interlayer induces PM through carrier accumulation at the electrode interface without relying on trap-assisted charge storage in the active layer, enabling both high gain and fast response characteristics. Furthermore, the influence of halide composition on PM behavior was investigated by comparing I- and Br- based PQDs. The optimized device exhibited an EQE of 3,000%, a specific detectivity (D*) of 1×1011 Jones, and a −3 dB bandwidth of 10 kHz at 1310 nm, representing one of the fastest response speeds reported for PM-OPDs operating at this wavelength. This work demonstrates PQD interlayer engineering as an effective strategy for realizing high-performance SWIR PM-OPDs for optical communication applications.
