Hole Conductivity of Thin Layers of Cadmium Telluride with Li and Ca Impurities

Abstract

By low-temperature annealing of n-CdTe substrates in aqueous suspensions of LiNO3 and Ca(NO3)2 salts pconductivity layers are created. The estimated concentration of free holes in diffusion layers at 300K is (5-50)∙1015 см-3

Electrical properties of CdTe<Ca> thin layers

“…Typically, the thickness of the lightabsorbing semiconductor layer is only 1 to 3 microns. The process of producing such photovoltaic cells is more automated and has a much lower cost Despite the fact that cadmium telluride has bipolar conductivity, the production of low-resistance crystals or p-type layers continues to be an urgent task [1]. This is due to the need for p-n junctions with low sequential resistance, as well as the problem of making low-ohmic contacts to high-ohmic p-CdTe.…”

“…This is due to the need for p-n junctions with low sequential resistance, as well as the problem of making low-ohmic contacts to high-ohmic p-CdTe. In addition, p-CdTe thin films are promising for photovoltaics cell based on CdS/CdTe, ITO/CdTe heterostructures [1].…”

Оптичні властивості CdTe, легованого Ca

“…For studies of their properties, substrates with a size of 4×4×1 mm 3 were cut out and their chemical-mechanical treatment was carried out according to the classical method. Doping with an isovalent admixture of Ca was carried out in an aqueous solution of Ca(NO3)2 [8].…”

Solar cells based on CdTe thin films (Part II)

“…To obtain voltage, a heterojunction between CdTe and another material, such as copper (Cu), must be used, ensuring a high-quality junction. It is important to consider the electrical properties, including the optimal concentration of electrons and holes in CdTe, to achieve maximum solar cell efficiency [6,7]. Additionally, CdTe must be resistant to moisture, temperature changes, ultraviolet radiation, and mechanical damage [6].…”