Single-Layer SWIR Photodetector with a PbS Quantum Dot–Polymer Composite
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
With the rapid expansion of autonomous driving and smart-factory technologies, the demand for LIDAR sensorscontinues to increase. A short-wave infrared (SWIR) photodetector capable of detecting laser light for LIDAR 3D mapping is a keycomponent of these systems. Among candidate materials, PbS quantum dots (QDs) enable low-cost, solution-processed fabricationand wavelength tunability within the eye-safe region above 1400 nm. However, conventional multilayer device structures requiresequential solution deposition of electron and hole transport layers, which can cause interlayer dissolution and limit device stability. In this study, PbS QDs were synthesized with a target wavelength of 1533 nm and blended with [6,6]-phenyl-C61-butyric acidmethyl ester (PCBM) and poly(3-hexylthiophene) (P3HT) to form a single composite ink. A monolithic SWIR photodetector wasthen fabricated via screen printing. The single-layer architecture enhanced carrier mobility and minimized interfacial defects. Structural and optical analyses confirmed the successful formation of PbS QDs, and electrical characterization under infraredillumination revealed a maximum photoresponse of 277%, a current change of approximately 440 µA, and a response time of 0.42s. These results demonstrate that the PbS QD–PCBM–P3HT composite enables a simplified, stable, and high-performance SWIRphotodetector suitable for next-generation LIDAR applications.
Abstract
With the rapid expansion of autonomous driving and smart-factory technologies, the demand for LIDAR sensorscontinues to increase. A short-wave infrared (SWIR) photodetector capable of detecting laser light for LIDAR 3D mapping is a keycomponent of these systems. Among candidate materials, PbS quantum dots (QDs) enable low-cost, solution-processed fabricationand wavelength tunability within the eye-safe region above 1400 nm. However, conventional multilayer device structures requiresequential solution deposition of electron and hole transport layers, which can cause interlayer dissolution and limit device stability. In this study, PbS QDs were synthesized with a target wavelength of 1533 nm and blended with [6,6]-phenyl-C61-butyric acidmethyl ester (PCBM) and poly(3-hexylthiophene) (P3HT) to form a single composite ink. A monolithic SWIR photodetector wasthen fabricated via screen printing. The single-layer architecture enhanced carrier mobility and minimized interfacial defects. Structural and optical analyses confirmed the successful formation of PbS QDs, and electrical characterization under infraredillumination revealed a maximum photoresponse of 277%, a current change of approximately 440 µA, and a response time of 0.42s. These results demonstrate that the PbS QD–PCBM–P3HT composite enables a simplified, stable, and high-performance SWIRphotodetector suitable for next-generation LIDAR applications.