Affiliation:
1. Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Academy for Engineering & Technology Fudan University Shanghai 200438 China
2. Laser Fusion Research Center China Academy of Engineering Physics Mianyang 621900 China
3. Zhejiang Laboratory Hangzhou 311100 China
Abstract
AbstractAs a third‐generation infrared detector, the quantum cascade detector (QCD) exhibits an accurately adjustable wavelength, low noise, and ultrafast response characteristics. By introducing an additional doping layer, QCD also shows excellent application prospects in the broadband response. Herein, a coupled doped‐well QCD with an array structure located at very long‐wave infrared (VLWIR, ≈15 µm) is prepared. Based on the energy levels interaction and carrier distribution, the regulatory mechanism of the applied bias on the response characteristics is explored. At zero bias, the detector exhibits dual‐wavelength detection owing to the splitting of the energy levels, then transforms into single‐wavelength detection with the bias increasing. Simultaneously, the QCD device exhibits a broadband response (≈13–16 µm) from 15 to 300 K and an excellent detectivity of 1.52 × 1012 cm Hz1/2 W−1 at 15 K. A high R0A (>106 Ω cm2) and robust detectivity (>109 cm Hz1/2 W−1) are obtained at room temperature. The results of the response characteristics presented in this work provide a strategy for the flexible application of QCD in infrared detection.
Funder
National Natural Science Foundation of China
Program of Shanghai Academic Research Leader
Subject
Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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