Theoretical Determination of Optimal Material Parameters for ZnCdTe/ZnCdSe Quantum Dot Intermediate Band Solar Cells
| Autor: | Igor L. Kuskovsky, Lev I. Deych, G. Ranepura, C. M. Imperato |
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| Rok vydání: | 2018 |
| Předmět: |
Range (particle radiation)
Work (thermodynamics) Materials science Solid-state physics business.industry Photovoltaic system 02 engineering and technology Substrate (electronics) 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials law.invention Variational method Quantum dot law 0103 physical sciences Solar cell Materials Chemistry Optoelectronics Electrical and Electronic Engineering 010306 general physics 0210 nano-technology business |
| Zdroj: | Journal of Electronic Materials. 47:4325-4331 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-018-6241-6 |
| Popis: | Intermediate band solar cells (IBSCs) are designed to enhance the photovoltaic efficiency significantly over that of a single-junction solar cell as determined by the Shockley–Queisser limit. In this work we present calculations to determine parameters of type-II Zn1−xCdxTe/Zn1−yCdySe quantum dots (QDs) grown on the InP substrate suitable for IBSCs. The calculations are done via the self-consistent variational method, accounting for the disk form of the QDs, presence of the strained ZnSe interfacial layer, and under conditions of a strain-free device structure. We show that to achieve the required parameters relatively thick QDs are required. Barriers must contain Cd concentration in the range of 35–44%, while Cd concentration in QD can vary widely from 0% to 70%, depending on their thickness to achieve the intermediate band energies in the range of 0.50–0.73 eV. It is also shown that the results are weakly dependent on the barrier thickness. |
| Databáze: | OpenAIRE |
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