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THEORETICAL STUDY OF SPECTRAL RESPONSES OF HOMOJONCTIONS BASED ON CuInSe2 DEPOSITED ON SUBSTRATE WITH OR WITHOUT A WINDOWS LAYER : EFFECT OF AN ELECTRIC FIELDS

The aim of this work is to make a comparative study of the spectral response between the two models of solar cells, namely a homojonction deposited on substrate without a window layer: CuInSe2(N)/ CuInSe2(P) /CdTe(P+) and a homojonction deposited on substrate with a window layer: CdS (N+)/CuInSe2(N)/ CuInSe2(P)/CdTe(P+). In this case we will calculate the respective different expressions of the spectral response by solving the continuity equations governing the variation of the minority carriers in each region for each model and using the boundary conditions. A simulation of this quantum efficiency with the energy is done, keeping the same values of geometrical parameters. The results show that the homojonction model with a window layer and deposited on substrate gives the best quantum efficiency. The window layerdecreases the losses at the surface and at the window-emitter interface and increases in the base the collection of electrons. We will then study the influence of an internal electrical field due to a doping gradient on a homojonction deposited on substrate with or without a window layer. We note that the internal quantum efficiency rises with the increasing of the additional electric field in the window layer. We also note that the best quantum efficiency is obtained with a homojonction deposited on substrate for an internal electric field of 2.10?Vcm-1. We remark a concordance of our results to those found in literature.


Auteur(s) : Y. Tabar ; M. L. SOW ; E. M. Keita ; A. A. Correa ; B. Mbow
Pages : pp. 837 à 844
Année de publication : 2018
Revue : JOURNAL OF MATERIALS SCIENCES SCIENCE AND SURFACE ENGINEERING (JMSSE),
N° de volume : 2018 ; 6(4) : 837-844
Type : Article
Mise en ligne par : SOW Mamadou Lamine