PROSPECTS OF USING SURFACE AND BARRIER CDTE-DIODES IN SOLAR ENERGY
Journal Title: Сенсорна електроніка і мікросистемні технології - Year 2019, Vol 16, Issue 2
Abstract
The paper discusses the advantages and disadvantages of the most used today semiconductor materials of different structural perfection (single crystals, polycrystalline and amorphous) to create solar cells. The main attention is paid to the study of the possibilities of using surface-barrier diodes (SBD) as photoconverters based on single-crystal cadmium telluride. A number of technological methods for modifying n-CdTe substrates are analyzed, which lead to a significant improvement in the electrical and photoelectric parameters and characteristics of SBD. It has been established that the treatment of substrates in an aqueous suspension of alkali metal salts causes the potential barrier ϕ0 height and the open circuit voltage of diodes Vo c based on them to increase by about 1.8 times compared with similar parameters of SBD on the base substrates. Annealing of the latter under certain conditions in air leads to the formation of a surface nanostructure, as a result of which not only almost a twofold increase is observed ϕ0 and Vo c , but also a significant expansion of the photosensitivity Sω spectrum of diodes based on unmodified substrates. It was established that the surface recombination rate of SBD on the basis of substrates with surface nanostructures is two and one orders of magnitude lower than in structures based on basic substrates and treated in suspension of alkali metal salts, respectively. It is shown that the photoconversion efficiency of SBD based on substrates with surface nanostructure (CdTe:O2 ) reaches 13% at 300 K in AM2 lighting conditions. The use of technologies used in the creation of surface-barrier solar cells based on cadmium film telluride is discussed.
Authors and Affiliations
V. P. Makhniy, M. M. Berezovskiy, O. V. Kinzerska, M. P. Mazur, T. M. Mazur, V. V. Prokopiv
Keywords
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- EP ID EP670175
- DOI 10.18524/1815-7459.2019.2.171227
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