title: Nanoscale imaging of the photoresponse in PN junctions of InGaAs infrared detector.
abstract: Electronic layout, such as distributions of charge carriers and electric field, in PN junction is determinant for the photovoltaic devices to realize their functionality. Considerable efforts have been dedicated to the carrier profiling of this specific region with Scanning Probe Microscope, yet reliable analysis was impeded by the difficulty in resolving carriers with high mobility and the unclear surface effect, particularly on compound semiconductors. Here we realize nanometer Scanning Capacitance Microscopic study on the cross-section of InGaAs/InP photodetectors with the featured dC/dV layout of PN junction unveiled for the first time. It enables us to probe the photo-excited minority carriers in junction region and diagnose the performance deficiency of the diode devices. This work provides an illuminating insight into the PN junction for assessing its basic capability of harvesting photo-carriers as well as blocking leakage current in nanoscopic scale.
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 YuTian Road, Shanghai 200083, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Xia
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 YuTian Road, Shanghai 200083, People's Republic of China.
authors.forename: Tian-Xin
authors.initials: TX
authors.lastname: Li
authors.affiliation: Key Laboratory of Infrared Imaging Materials and Detectors, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 YuTian Road, Shanghai 200083, People's Republic of China.
authors.forename: Heng-Jing
authors.initials: HJ
authors.lastname: Tang
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 YuTian Road, Shanghai 200083, People's Republic of China.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Infrared Imaging Materials and Detectors, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 YuTian Road, Shanghai 200083, People's Republic of China.
authors.forename: Xue
authors.initials: X
authors.lastname: Li
authors.affiliation: Key Laboratory of Infrared Imaging Materials and Detectors, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 YuTian Road, Shanghai 200083, People's Republic of China.
authors.forename: Hai-Mei
authors.initials: HM
authors.lastname: Gong
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 YuTian Road, Shanghai 200083, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lu