Document Type : Original Research Paper


1 Department of Electrical and Computer Engineering, Faculty of Agriculture, Fasa Branch, Technical and Vocational University (TVU), Fars, Iran

2 Department of Electrical Engineering, Fasa Branch, Islamic Azad University, Fasa, Iran


< p>Background and Objectives: In this article, the functionality of solar cells structure based on CuIn1-xGaxSe2 is investigated. This type of solar cell consists of different layers, namely, ZnO (TCO layer), Cd_S (Buffer layer), CIGS (Absorbent layer), and MO (Substrate layer). Two layers, Cd_S and CIGS, form a PN Junction. 
< p>Methods: CIGS thin film solar cell is simulated using SILVACO software. The absorbent layer doping was originally changed.  Later doping was kept constant and P-type layer of InAsP was added. Their effect on cell function was observed and examined. It was observed that after doping some parameters of the solar cell have improved whilst some others have decreased. It was also concluded that examined increase or decrease in the amount of dopant would reduce our efficiencies of solar cell.
< p>Results: Added the InAsP layer leads to increased open circuit voltage, short circuit current and the solar cell power, consequently gives the efficiency about 33.2%, which is an acceptable efficiency.
< p>Conclusion: It was clear that extreme increase or decrease in the amount of dopant in the absorbent layer can change solar cell parameters, and can improve cell functionality.
< p>The amount of dopants can also alter some other solar cell parameters which are not desirable, the added InAsP layer leads to increased open circuit voltage, and short circuit current and the solar cell power, consequently gives the about 33.2%, efficiency which is an acceptable efficiencies.

©2018 The author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, as long as the original authors and source are cited. No permission is required from the authors or the publishers.


Main Subjects

[1] M. Nagaich, S. Campbell, E. Aydil, “Wide band-gap CuIn1-xGaxSe2 based chalcopyrite absorbers for tandem cell application,” presented at the 37th IEEE Photovoltaic Specialists Conf., Seattle, USA, 2011.

[2] P. Reinhard, “Review of progress toward 20% efficiency flexible CIGS solar cells and manufacturing issues of solar modules,” IEEE Journal Of Photovoltaics, 3(1): 42-44, 2013.

[3] D. K. Suri, K. C. Nagpal, G. K. Chadha, “X-ray study of CuGaxIn1-xSe2 solid solutions,” Journal of Applied Crystallography, 22(6): 578-583, 1989.

[4] F. B. Dejene, V. Alberts, “Structural and optical properties of homogeneous Cu(In,Ga)Se2 thin films prepared by thermal reaction of InSe/Cu/GaSe alloys with elemental Se vapour,” Journal of Physics D: Applied Physics, 38(1): 22, 2005.

[5] J. H. Scofield, A. Duda, D. Albin, B. L. Ballard, P. K. Predecki, “Sputtered molybdenum bilayer back contact for copper indium diselenide-based polycrystalline thin-film solar cells,” Thin Solid Films, 260(1): 26-31, 1995.

[6] G. Gordillo, M. Grizález, L. C. Hernandez, “Structural and electrical properties of DC sputtered molybdenum films,” Solar Energy Materials and Solar Cells, 51(3): 327-337, 1998.

[7] T. Nakada, A. Kunioka, “Direct evidence of Cd diffusion into Cu(In,Ga)Se2 thin films during chemical-bath deposition process of CdS films,” Applied Physics Letters, 74(17): 2444-2446, 1999.

[8] A. Kylner, “The role of the CdS buffer layer in the Cu(In,Ga)Se2 thin film solar cell,” Acta Universitatis Upsaliensis, 1998.

[9] A. R. Jeong, R. H. Shin, W. Jo, M. Song, S. Yoon, “Synthesis and physical properties of Cu(In,Ga)Se2 nanoparticles and CuGaSe2 thin-films for tandem cell photovoltaic applications,” presented at the 35th IEEE Photovoltaic Specialists Conf., Honolulu, USA, 2010.

[10]  P. Reinhard, “Review of progress toward 20% efficiency flexible CIGS solar cells and manufacturing issues of solar modules,” IEEE Journal Of Photovoltaics, 3(1): 42-48, Oct 2013.

[11] Z. Beiley, A. Bowring, M. D. McGehee, “Modeling low-cost hybrid tandem Photo voltaic with power conversion efficiencies exceeding 20%,” presented at the 38th IEEE Photovoltaic Specialists Conf., Austin, USA, 2012.

[12] A. Rohatgi,“High-throughput ion-implantation for low-cost high-efficiency silicon solar cells,” Energy Procedia, 15: 10-19, 2013.

[13] Y. G. Xiao et al., “Modeling of CdZnTe nad CIGS and tandem solar cells,” in Proc. 35th IEEE Photovoltaic Specialists Conf., Honolulu, USA: 20–25, 2010.

[14] L. Fraas, L. Partain, “Solar Cells and Their Applications, Second Edition,” John Wiley & Sons, Inc., 2010.

[15] K. Ramanathan, M. A. Contreras, C. L. Perkins, S. Asher, F. S. Hasoon, J. Keane, D. Young, M. Romero, W. Metzger, R. Noufi, J. Ward, A Duda, “Properties of 19.2% efficiency ZnO/CdS/CuInGaSe2 thin film solar cells,” Progress in Photovoltaics: Research and applications, 11(4): 225-230, 2003.

[16] H. Firoozi, M. Imanieh “Improvement performance CIGS thin film solar cells by changing the thickness Cd_S layer,” UCT Journal of Research in Science, Engineering and Technology, vol5(2): 39-42, 2017.


Journal of Electrical and Computer Engineering Innovations (JECEI) welcomes letters to the editor for the post-publication discussions and corrections which allows debate post publication on its site, through the Letters to Editor. Letters pertaining to manuscript published in JECEI should be sent to the editorial office of JECEI within three months of either online publication or before printed publication, except for critiques of original research. Following points are to be considering before sending the letters (comments) to the editor.

[1] Letters that include statements of statistics, facts, research, or theories should include appropriate references, although more than three are discouraged.

[2] Letters that are personal attacks on an author rather than thoughtful criticism of the author’s ideas will not be considered for publication.

[3] Letters can be no more than 300 words in length.

[4] Letter writers should include a statement at the beginning of the letter stating that it is being submitted either for publication or not.

[5] Anonymous letters will not be considered.

[6] Letter writers must include their city and state of residence or work.

[7] Letters will be edited for clarity and length.