Modulation transfer function and effective diffusion length of photogenerated charge carriers in mercury-cadmium-telluride focal-plane diode arrays with different values of geometric parameters

Stuchinskiy, V.A., Vishnyakov A.V., Vasiliev, V.V.

For Russian citation (Opticheskii Zhurnal):

Стучинский В.А., Вишняков А.В., Васильев В.В. Частотно-контрастная характеристика и эффективная длина диффузии фотогенерированных носителей заряда в фотоприёмных матрицах на основе материала кадмий-ртуть-теллур с разными значениями геометрических параметров // Оптический журнал. 2024. Т. 91. № 2. С. 59–66. http://doi.org/10.17586/1023-5086-2024-91-02-59-66

Stuchinsky V.A., Vishnyakov A.V., Vasiliev V.V. Modulation transfer function and effective diffusion length of photogenerated charge carriers in mercury-cadmium-telluride focal-plane diode arrays with different values of geometric parameters [In Russian] // Opticheskii Zhurnal. 2024. V. 91. № 2. P. 59–56. http://doi.org/10.17586/1023-5086-2024-91-02-59-66

For citation (Journal of Optical Technology):

Abstract:

The subject of study is the spatial resolution of two-dimensional focal plane arrays and the effective diffusion length of photogenerated charge carriers in their photosensitive layer. The aim of study is determination of the dependence of the modulation transfer function and the effective diffusion length of photogenerated charge carriers on the size of the diodes and on the thickness of the absorber layer in two-dimensional focal-plane arrays. Method. The diffusion of the charge carriers in the absorber layer of focal plane arrays is analyzed by simulating the stochastic migration of the particles by the Monte Carlo method with a fixed step length. Main results. It was found that at a fixed pitch of focal plane arrays sized 15 µm and at realistic values of the bulk diffusion length of photogenerated charge carriers of 20 µm, the resolution of the arrays improves both with increasing the diode size and with decreasing the absorber-layer thickness under the diodes. Simultaneously, the effective diffusion length of photogenerated charge carriers in both cases decreases. Practical significance. The established dependence of spatial resolution on the geometric parameters will make it possible to design focal-plane-array photodetectors with high spatial resolution.

Keywords:

focal-plane-array detector, diode, absorber, mercury-cadmium-tellurium material, charge carriers, diffusion length, line spread function, modulation transfer function

OCIS codes: 040.1240, 040.3060, 040.5160, 040.6070, 130.5990, 350.5730

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