T HEO RETICAL COMPARATIVE STUDY OF INTERNAL QUANTUM EFFICIENCY OF THIN FILMS SOLAR CELLS BASED ON CuInSe 2 : p + /p/n/n + , p/n/n + , p + /p/n and p/n MODELS

In this paper we propose to study the performances of thin films solar cells based on CuInSe 2 . The following models are studied : p /n ; p + /p/n ; p/n/n + ; p + /p/n/n + . The objective of this work is to study the performance of the homojunction based on CuInSe 2 , with a medium band gap window layer based on CuInS 2 , deposited on a substrate, according to the model CuInS 2 (p + )/CuInSe 2 (p)/CuInSe 2 (n)/CuInSe 2 (n + ) ( p + /p/n/n + ). We compare this structure ( p + /p/n/n + ) with the following models: the homojunction CuInSe 2 (p)/CuInSe 2 (n) (p/n), the homojonction with window layer CuInS 2 (p + )/CuInSe 2 (p)/CuInSe 2 (n) ( p/n/n + ) and the homojunction deposited on substrate CuInSe 2 (p) /CuInSe 2 (n)/ CuInSe 2 (n + ) ( p/n/n + ). Calculation models for determining the density of the minority carriers, the density of the photocurrent, and the internal quantum efficiency were established for the different structures. These theoretical results are used to compare their performance. In order to test the validity of our calculations models, We compare our results with some experimental results published in the literature.