The Impact of the Colloidal Quantum Size Dispersion on the Absorption Coefficient of the Photodiode on their Base

Editorial Board PCSS Journal; M.V. Strikha; A.A. Sakun

doi:10.15330/pcss.27.2.356-360

Authors

M.V. Strikha Taras Shevchenko National University of Kyiv, Kyiv, Ukraine; V. Ye. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, Kyiv, Ukraine
A.A. Sakun Taras Shevchenko National University of Kyiv, Kyiv, Ukraine

DOI:

https://doi.org/10.15330/pcss.27.2.356-360

Keywords:

Colloidal quantum dots, photodiode, size dispersion, absorption coefficient

Abstract

It was demonstrated within a simple theoretical model that the size dispersion of the colloidal quantum dots ensemble influence essentially on the absorption coefficient of the photodiodes on their base, and therefore is to be taken into consideration within the description of the operation of modern photodetectors for the Infra-Red range. The increase of dispersion of the nanoparticles ensemble in the photodetector leads to essential decrease of the absorption coefficient at the frequency, which corresponds the absorption in the nanoparticles of the mean size. The typical dependence of the absorption coefficient on frequency includes the sharp increase at the frequencies, close to the intrinsic absorption edge of the quantum dot, followed then by the decrease according to formula , where the denominator includes the gap value in the bulk material, and later – the further increase due to transitions including the upper energy levels of the nanoparticle.

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