Visible-extended mid-infrared wide spectrum detector based on InAs/GaSb type-Ⅱ superlattices (T2SL)

Guo, Chunyan, Sun, Yaoyao, Jia, Zhe, Jiang, Zhi, Lv, Yuexi, Hao, Hongyue, Han, Xi, Dong, Yinan, Jiang, Dongwei, Wang, Guowei, Xu, Yingqiang, Wang, Tao, Tian, Jinshou, Wu, Zhaoxin and Niu, Zhichuan (2018) Visible-extended mid-infrared wide spectrum detector based on InAs/GaSb type-Ⅱ superlattices (T2SL). Infrared Physics and Technology, 89, 147-153. (doi:10.1016/j.infrared.2017.12.020).

Abstract

The authors report an innovative design of wide spectrum detector that can detect visible and mid-infrared spectrum, from 0.4 to 5 μm, simultaneously. The detector is designed with microstructure of various types of photon traps fabricated on mid-infrared InAs/GaSb type-II superlattice materials. Quantum efficiency has been significantly improved due to the action of photon traps which can decrease the reflectivity of the surface of InAs/GaSb type-Ⅱ superlattice down to less than 5%. Under the condition of 77 K and 200 mV bias voltage, the responsivity of the detector is about 0.025–0.45 A/W in the visible wavelength regime of 400–790 nm, more than 0.3 A/W in spectrum of 800–2000 nm, respectively. Through the optimized photon trap structure, the responsivity of detector is to 1.25 A/W and predominantly improve the quantum efficiency of the detector up to 52.5% at 3 μm.

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