https://doi.org/10.1140/epjp/s13360-026-07463-5
Regular Article
Size-dependent quantum efficiency and optical absorption in CdTe/ZnSe quantum dots for ultraviolet photodetection
1
Department of Physics, College of Education, University of Al-Qadisiyah, Diwaniyah, Iraq
2
Nasiriya Nanotechnology Research Laboratory (NNRL), College of Science, University of Thi-Qar, Nasiriya, Iraq
a
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Received:
5
August
2025
Accepted:
19
February
2026
Published online:
5
March
2026
Abstract
A comprehensive simulation-based analysis is performed to assess the optical absorption characteristics and quantum efficiency (QE) of cadmium telluride/zinc selenide (CdTe/ZnSe) quantum dot (QD) stacks, geared toward their application in ultraviolet (UV) photodetectors. The simulation outcomes clearly bring out the sensitivity of both QD radius and junction height to absorption coefficient and QE. For example, QDs with lower radii and heights contribute toward stronger quantum confinement effects, exploring sharper absorption spectra and higher QE values around 215 and 232 nm. Additionally, from junction depth analysis, there is direct proportionality between depletion width and QE. The simulation study also identified secondary factors of minority diffusion lengths (electron and hole diffusion lengths), most appreciable at larger junction depths. The outcome has effectively verified that QDs with appropriate sizes and junction designs, in addition to optimized carrier transport properties, play crucial roles in exploring superior performance characteristics of deep-UV QD-based photodetectors. The simulation outcome is helpful for exploring design strategies for highly efficient size-engineered QD-based photodetectors.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
