中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5366-5369.doi: 10.1088/1674-1056/18/12/041

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Optimization of a solar-blind and middle infrared two-colour photodetector using GaN-based bulk material and quantum wells

岑龙斌, 沈波, 秦志新, 张国义   

  1. State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2009-03-04 修回日期:2009-03-16 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 60806042, 10774001,60736033, 60890193 and 60628402), National Basic Research Program of China (Grant Nos 2006CB604908 and 2006CB921607), and the Research Fund for the Doctora

Optimization of a solar-blind and middle infrared two-colour photodetector using GaN-based bulk material and quantum wells

Cen Long-Bin(岑龙斌), Shen Bo(沈波)†, Qin Zhi-Xin(秦志新), and Zhang Guo-Yi(张国义)   

  1. State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
  • Received:2009-03-04 Revised:2009-03-16 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 60806042, 10774001,60736033, 60890193 and 60628402), National Basic Research Program of China (Grant Nos 2006CB604908 and 2006CB921607), and the Research Fund for the Doctora

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摘要： This paper calculates the wavelengths of the interband transitions as a function of the Al mole fraction of AlxGa1-xN bulk material. It is finds that when the Al mole fraction is between 0.456 and 0.639, the wavelengths correspond to the solar-blind (250~nm to 280~nm). The influence of the structure parameters of AlyGa1-yN/GaN quantum wells on the wavelength and absorption coefficient of intersubband transitions has been investigated by solving the Schr?dinger and Poisson equations self-consistently. The Al mole fraction of the AlyGa1-yN barrier changes from 0.30 to 0.46, meanwhile the width of the well changes from 2.9~nm to 2.2~nm, for maximal intersubband absorption in the window of the air (3~μm <λ <5~μm). The absorption coefficient of the intersubband transition between the ground state and the first excited state decreases with the increase of the wavelength. The results are finally used to discuss the prospects of GaN-based bulk material and quantum wells for a solar-blind and middle infrared two-colour photodetector.

Abstract: This paper calculates the wavelengths of the interband transitions as a function of the Al mole fraction of AlxGa1-xN bulk material. It is finds that when the Al mole fraction is between 0.456 and 0.639, the wavelengths correspond to the solar-blind (250 nm to 280 nm). The influence of the structure parameters of AlyGa1-yN/GaN quantum wells on the wavelength and absorption coefficient of intersubband transitions has been investigated by solving the Schr?dinger and Poisson equations self-consistently. The Al mole fraction of the AlyGa1-yN barrier changes from 0.30 to 0.46, meanwhile the width of the well changes from 2.9 nm to 2.2 nm, for maximal intersubband absorption in the window of the air (3 μm < $\lambda$ < 5 μm). The absorption coefficient of the intersubband transition between the ground state and the first excited state decreases with the increase of the wavelength. The results are finally used to discuss the prospects of GaN-based bulk material and quantum wells for a solar-blind and middle infrared two-colour photodetector.

Key words: quantum well, two-colour detector, intersubband transition

中图分类号:  (Photodetectors (including infrared and CCD detectors))

  • 85.60.Gz
68.65.Fg (Quantum wells) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)) 78.67.De (Quantum wells)