Copper Sulfide (Cu_xS) Thin Films as Possible p-Type Absorbers in 3D Solar Cells

摘要

Films of Cu_xS with 217 -502 nm thickness were deposited by Automatic Spray Pyrolysis technique, at T = 275-325 °C, from water:ethanol:glycerol= 7:2:1 (in volumes) solutions with molar ratio Cu:S = 1:2.5-3.5. Relative dense, homogenous and uniform films of Cu_xS (x = 1-2), containing copper-rich phase digenite (single, predominant or secondary crystalline phase), with E_g = 2.41-3.1 eV and exhibiting electric resistance behavior were obtained. The optimized Cu_xS layers were integrated in 3D solar cells which show the diode behavior but the photovoltaic response is very low, in the experimental conditions.