Modulated Photoluminescence Mapping of Long-Wavelength Infrared InAs / GaSb Type-II Superlattice: In-Plane Optoelectronic Uniformity
Artikel i vetenskaplig tidskrift, 2021

In-plane uniformity of narrow-gap semiconductor InAs/GaSb type-II superlattice (T2SL) wafer is a crucial yet hard-to-evaluate prerequisite for high-performance long-wavelength infrared optoelectronic device applications of, e.g., focal-plane-array (FPA) photodetectors. In this work, we report a modulated photoluminescence-mapping (PL-mapping) study of InAs/GaSb T2SL in long-wavelength infrared range with a spatial resolution of a typical FPA-pixel scale. Spatial distributions are analyzed of PL-peak energy, linewidth, and integral intensity, which indicate a high in-plane uniformity of effective band gap but a considerable fluctuation of radiative recombination. The in-plane distributions of effective carrier lifetime and Shockley-Read-Hall defect concentration are evaluated, with the aid of a model that takes into account the pumping power dependence of the PL integral intensity. The results reveal a considerable in-plane nonuniformity of the optoelectronic response that may restrict the performance of the derivative FPA photodetector, and indicate the modulated PL mapping of a good pathway particularly for uniformity analysis of long-wavelength infrared FPA semiconductors.


X Chen

Chinese Academy of Sciences

Liangqing Zhu

Chinese Academy of Sciences

East China Normal University

Yanchao Zhang

Zhejiang SuperMat Sen-Ray Optoelectronics Co. Ltd.

Fan Zhang

Zhejiang SuperMat Sen-Ray Optoelectronics Co. Ltd.

Shu Min Wang

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

J. Shao

Chinese Academy of Sciences

Physical Review Applied

2331-7019 (eISSN)

Vol. 15 4 044007


Atom- och molekylfysik och optik

Sannolikhetsteori och statistik



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