Properties of the CdCl2 air-annealed CSS CdTe thin films

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Thin 7-9 μm CdTe films have been deposited on soda lime glass by close-spaced sublimation (CSS). By controlling the CSS temperature-time profile of source and substrate the pinhole-free CdTe films with a good adhesion on roughened glass were prepared. The classical solution-based CdCl2 was applied to enhance the film crystallinity and optoelectronic properties of the CdTe layers. The layers were characterized by X-ray diffraction, Raman and Photoluminescence spectroscopy, scanning microscopy (SEM), energy dispersive X-ray microanalysis and Van der Paw method. CdCl2 heat treatment is a key step in CdTe device processing. Howeverthe process leaves a significant amount of chlorine-rich residue on the CdTe surface that decreases performance of the solar cell.Annealing of the CdCl2-treated polycrystalline CdTeimproves the optoelectronic properties and thus enhances the performance of CdTe/CdS solar cells. A correlation between the structural and optoelctronic properties of CdTe layers and annealing conditions in nitrogen atmosphere at 250, 400 and 450°C for 60 min of the CdCl2treated layers has been found. © 2014 The Authors.




Spalatu, N., Hiie, J., Valdna, V., Caraman, M., Maticiuc, N., Mikli, V., … Lughi, V. (2014). Properties of the CdCl2 air-annealed CSS CdTe thin films. In Energy Procedia (Vol. 44, pp. 85–95).

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