Dark current investigation in individual planar In0.53Ga0.47As/InP detector and fine pixel-pitch array with spacing variations

Wenqi Wang; Zhen Deng; Xinxin Li; Lili Han; Junyang Zhang; Yangfeng Li; Wenxin Wang; Haiqiang Jia; Hong Chen

Results in Optics (Dec 2021)

Dark current investigation in individual planar In0.53Ga0.47As/InP detector and fine pixel-pitch array with spacing variations

Wenqi Wang,
Zhen Deng,
Xinxin Li,
Lili Han,
Junyang Zhang,
Yangfeng Li,
Wenxin Wang,
Haiqiang Jia,
Hong Chen

Affiliations

Wenqi Wang: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Corresponding authors at: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Zhen Deng: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Corresponding authors at: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Xinxin Li: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Lili Han: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Junyang Zhang: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Yangfeng Li: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Wenxin Wang: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
Haiqiang Jia: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
Hong Chen: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China; Corresponding authors at: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Journal volume & issue: Vol. 5
p. 100181

Abstract

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Nowadays, to achieve low-cost, high-resolution, and high-sensitivity focal plane array (FPA) detectors, researchers are pursuing smaller pixel sizes and higher fill factors in the array. However, as the spacing between adjacent detector reduce, the electrical cross talk increases, which leads to a high dark current and is detrimental to the performance of FPAs. Therefore, clarifying the origination of dark current and finding the minimum device spacing in the array is of great importance. In this paper, the dark current variations of the isolated planar In0.53Ga0.47As/InP detectors with different detector diameters are measured, and the main components of dark currents are lateral hole diffusion current. Besides, the minimum spacing between adjacent sensors with 10 μm pixel pitch is optimized. The results show that the spacing value of 2.5 μm can suppress the lateral diffusion dark current and avoid serious electrical crosstalk. In addition, the room-temperature response of array with 10 μm pitch (2.5 μm spacing) covers the wavelength range from 1 μm to 1.7 μm. This design and structure can be expected to be helpful in fabricating large-format short-wavelength planar FPA with low dark current and high fill factor.

Published in Results in Optics

ISSN: 2666-9501 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics: Optics. Light
Website: https://www.journals.elsevier.com/results-in-optics

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