THEORETICAL STUDY OF SPECTRAL RESPONSES OF HETEROJONCTIONS BASED ON CuInSe2 and CuInS2

Authors

  • elou keita authors
  • Dr B. ndiaye Laboratoire des Semiconducteurs et d’Energie Solaire, Département de Physique, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
  • Dr M. Dia Laboratoire des Semiconducteurs et d’Energie Solaire, Département de Physique, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
  • Dr Y. Tabar Laboratoire des Semiconducteurs et d’Energie Solaire, Département de Physique, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
  • Dr C. Sene Laboratoire des Semiconducteurs et d’Energie Solaire, Département de Physique, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
  • Dr B. Mbow Laboratoire des Semiconducteurs et d’Energie Solaire, Département de Physique, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal

Keywords:

Solar cells, Heterojunctions, CuInSe2 and CuInS2, Spectral Responses, base and substrate effects

Abstract

In this work we study the spectral responses of thin films solar cells of heterojunctions based on CuInSe2 and CuInS2. Four-layer structures are studied according to the n+n/pp+ model. First we consider the structure  ZnO(n+)/CdS(n)/CuInS2(p)/CuInSe2(p+) where CuInS2 represent the base and CuInSe2 the substrate in this model. Secondly we consider the structure ZnO(n+)/CdS(n)/CuInSe2(p)/ CuInS2(p+), for this model CuInSe2 represent the base and CuInS2 the substrate. ZnO and CdS are used as window layers in each structure. Using the continuity equation that governs transport of carriers in semiconductor material, models for calculating spectral responses are proposed for heterojunctions type n+n/pp+ based on CuInSe2 and CuInS2. For each structure we have presented the energy band diagram based on the Anderson model [1] and determined the expression of the photocurrent. The theoretical results obtained allow to compare the performances of these two models by optimizing the different parameters of each structure (base thickness, diffusion length, recombination velocity at the interface, etc.) in order to improve the overall efficiency of the collection of carriers.

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Published

2020-08-19

How to Cite

keita, elou, ndiaye, B. ., Dia, M. ., Tabar, Y., Sene, C., & Mbow, B. (2020). THEORETICAL STUDY OF SPECTRAL RESPONSES OF HETEROJONCTIONS BASED ON CuInSe2 and CuInS2. OAJ Materials and Devices, 5(1). Retrieved from http://caip.co-ac.com/index.php/materialsanddevices/article/view/120

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