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Title

DETERMINATION OF ENERGY LEVELS OF CDS THIN FILM BY ELECTROCHEMICAL METHODS: MOTT-SCHOTTKY, CYCLIC AND LINEAR SWEEP VOLTAMMETRY

Writers

MIANDARI S. | JAFARIAN M.

Pages

 Start Page | End Page

Abstract

 THE USE OF PHOTO-ELECTROCHEMICAL CELLS TO MEDIATE THE DIRECT CONVERSION OF OPTICAL ENERGY TO ELECTRICITY IS RECEIVING WIDESPREAD ATTENTION. CDS AS N-TYPE SEMICONDUCTOR HAS INCREASINGLY ATTRACTED INTEREST. BECAUSE IT HAS MANY POTENTIAL APPLICATIONS IN VARIOUS OPTOELECTRONIC DEVICES WITH A WIDE DIRECT OPTICAL BAND GAP OF 2.42 EV [7, 8]. IN THIS WORK WE FOCUSED ON THE INVESTIGATION OF CDS PHOTO-PROPERTIES BY SEVERAL ELECTROCHEMICAL METHODS SUCH AS CYCLIC VOLTAMMETRY (CV) FOR THE QUANTITATIVE ESTIMATION OF THE POSITION OF BAND ENERGY AND SURFACE STATES IN ALKALINE ELECTROLYTE [10-11]. SURFACE STATES ACT IN TRAPPING AND DETRAPPING OF PHOTOELECTRONS INDUCING THE CHARGE RECOMBINATION [13, 14] OR PROVIDE A PATH FOR ELECTRON TRANSFER IN THE ELECTRODE/ELECTROLYTE INTERFACE. ALSO THE BAND GAP ENERGY (EBG) AS MEASURED BY UV-VIS AND CV METHODS WERE OBTAINED 2.5 AND 2.3 EV RESPECTIVELY. MOTT-SCHOTTKY PLOTS WERE USED TO FIND THE FLAT BAND POTENTIAL (EFB), THE VALUE OF DONORS DENSITY (ND) AND THE DEBYE LENGTH (LD). THESE VALUES ARE CALCULATED -0.916 V/SCE, 3.21×1017CM-3 AND4.38×10-6CMRESPECTIVELY. ALSO, THE PRESENCE OF SURFACE STATES IS INVESTIGATED BY MOTT-SCHOTTKY AND LINEAR SWEEP VOLTAMMETRY (LSV) TECHNIQUES AND FOUND TO BE SET AT THE -0.7 V/SCE.SO, THE IMPORTANCE OF IMPROVED METHODS AS MENTIONED ABOVE, MAKE US TO INVESTIGATE THE PHOTO-PROPERTIES AND SEMICONDUCTOR PARAMETERS (SUCH AS EFB, EBG, ND AND LD) OF CDS THIN FILM BY MEANS OF UV-VIS SPECTROSCOPY AND ELECTROCHEMICAL METHODS E.G. MUTT- SCHOTTKY, CV, LSV.

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