انرژی خورشیدی :Solar Energy

“SUBSTRATE” CONFIGURED CdTe-BASED SOLAR CELLS
CdTe, CdS, ZnO and ZnO:Al thin films were prepared by Close-spaced sublimation (CSS), Chemical Bath Deposition (CBD) and Magnetron sputtering methods, respectively. The films were investigated by X- Ray Diffraction (XRD) and Atomic Force Microscopy (AFM) methods. Dependence of electrical properties on crystallinity degree of the obtained films were studied.
“Substrate” configured solar cell devices on the basis of obtained films were
constructed.

STRUCTURAL AND OPTICAL CHARACTERIZATION OF NANOSTRUCTURED CdS THIN FILMS DEPOSITED BY SPRAY PYROLYSIS METHOD

Influence of solution pH on the structural and optical properties of CdS films deposited by conventional spray pyrolysis technique was studied. X-Ray Diffraction (XRD), Atomic Force Microscopy (AFM), Photoluminescence spectroscopy and Spectroscopic Ellipsometry (SE) methods were used for the characterization of the films. The difference in the properties of the films was analyzed in terms of variation of grain sizes of the films
بکارگیری فن اوری بالای آزمایشگاهی برای سلول خورشیدی لایه نازک بر پایه CdTe با بیشترین بازده ضمن استفاده از فرصت های جدید نانو
Abstract

CdTe is regarded as one of the most promising materials for fabricating CdTe/CdS thin film solar cells with efficiencies up to 16.5%. In this paper we present a comparative analysis of CdTe-based solar cells fabricated by physical vapor deposition (PVD) and close-spaced sublimation (CSS) methods. The structural properties of CdTe base layers and the output parameters of CdS/CdTe solar cells are presented, and the influence of “CdCl2-treatment” on these properties are discussed. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were used in the studies.

Abstract

Low-temperature vacuum deposition instead of the commonly used vacuum  deposition at high substrate temperatures has been applied to prepare high fficiency (CdS/CdTe) solar cells. CdS and CdTe thin films have been subsequently deposited on SnO2/Corning 7059 glass substrates and examined by using scanning electron microscopy (SEM) and grazing incidence X-ray diffraction (GIXRD) techniques. It has been found that CdTe and CdS films deposited at low substrate temperature (218 K) have very similar grain sizes and surface morphology, necessary for high efficiency photovoltaic performance of the resultant device structures. Particularly, the obtained solar cells have shown efficiencies of more than 14%. The applied preparation method can be regarded as promising for high efficiency CdTe-based solar cell fabrication