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Mid-infrared Photoconductive Response in AlGaN/GaN Step Quantum Wells #MMPMID26395756
Rong X; Wang XQ; Chen G; Zheng XT; Wang P; Xu FJ; Qin ZX; Tang N; Chen YH; Sang LW; Sumiya M; Ge WK; Shen B
Sci Rep 2015[]; 5 (ä): ä PMID26395756show ga
AlGaN/GaN quantum structure is an excellent candidate for high speed infrared detectors based on intersubband transitions. However, fabrication of AlGaN/GaN quantum well infrared detectors suffers from polarization-induced internal electric field, which greatly limits the carrier vertical transport. In this article, a step quantum well is proposed to attempt solving this problem, in which a novel spacer barrier layer is used to balance the internal electric field. As a result, a nearly flat band potential profile is obtained in the step barrier layers of the AlGaN/GaN step quantum wells and a bound-to-quasi-continuum (B-to-QC) type intersubband prototype device with detectable photocurrent at atmosphere window (3?5??m) is achieved in such nitride semiconductors.