Enhancement in Photovoltaic Characteristics of CdS/CdTe Heterojunction

Year 2017, Volume: 20 Issue: 4, 801 - 805, 20.12.2017

Gökhan Sürücü Hasan Hüseyin Güllü Özge Bayraklı Mehmet Parlak

https://doi.org/10.2339/politeknik.368993

Cited By: 2

Abstract

The polycrystalline p-type CdTe thin film was deposited to form a solar cell structure with n-type CdS thin film window layer. Material characterization of the deposited thin films were investigated by X-ray diffraction measurements and the preferred orientations were obtained along (111) direction at 2θ ≅ 24° and 2θ ≅ 26.5° for CdTe and CdS films, respectively. The optical behaviors were investigated according to the transmission spectrum and corresponding direct band gap values were found as 1.51 eV for CdTe and 2.22 eV for CdS thin films. The superstrate CdS/CdTe thin film heterostructure was investigated under the dark and illuminated current-voltage measurements. The heterostructure showed a photovoltaic behavior with the cell efficiency of %1.4. The effects of the etching process on the photovoltaic behavior of CdS/CdTe thin film heterostructure were also discussed and the cell efficiency was enhanced as about %1.6 eV.

Keywords

CdS/CdTe, thin film solar cell, etching

References

• 1. Mughala M. A., Engelkena R. and Sharmab R., “Progress in indium (III) sulfide (In2S3) buffer layer deposition techniques for CIS, CIGS, and CdTe-based thin film solar cells”, Solar Energy, 120: 131–146, (2015). 2. Morales A. A, “Thin film CdS/CdTe solar cells: research perspectives”, Solar Energy, 80: 675–681, (2006). 3. Chu T.L. and Chu S.S., “Thin film II-VI photovoltaics”, Solid-State Electron, 38: 533-549, (1995). 4. Lee J., “Comparison of CdS films deposited by different techniques: Effects on CdTe solar cell”, Appl. Surf. Sci. 252: 1398–1403, (2005). 5. Matsumoto H., Kuribayashi K., Komatsu Y., Nakano A., Uda H. and Ikegami S., ‘‘30 × 30 cm2 CdS/CdTe Single Substrate Module Prepared by Screen Printing Method’’, Japan. Journal of Applied Physics, 22: 891, (1983). 6. Wu X., Keane J.C., Dhere R.G., Dehart C., Albin D.S., Duda A., Gessert T.A., Asher S.D., Levi H. and Sheldon P., “Seventeenth European Photovoltaic Solar Energy Conference”, Proceedings from the International Conference WIP Munich and ETA‐Florence, 1: 995, (2001). 7. Abbas Shah N., Ali A., Ali Z., Maqsood A.and Aqili A.K.S., ‘‘Properties of Te‐rich cadmium telluride thin films fabricated by closed space sublimation technique’’, Journal of Crystal Growth, 284: 477, (2005). 8. Nakayama N., Matsumoto H., Nakano A., Ikegami S., Uda H., Yamashita T., ‘‘Ceramic thin film CdTe solar cell.’’ Journal of Applied Physics, 19: 703 (1980). 9. Khan M.A., Shah N.A., Ali A., Basharat M., Hannan M.A. and Maqsood A., ‘‘Fabrication and characterization of Cd enriched CdTe thin films by close spaced sublimation.’’ Journal of Coatings Technology and Research, 6: 251–256, (2009). 10. Menezes C.A, ‘‘Low resistivity CdTe‐Te films by a combined hot‐wall‐flash evaporation technique.’’ ECS Journal of Solid‐State Science and Technology, 127: 155 (1980). 11. Rondiyaa S., Rokadea A., Fundea A., Karthab M., Pathanb H. and Jadkarb S.,” Synthesis of CdS thin films at room temperature by RF-magnetron sputtering and study of its structural, electrical, optical and morphology properties”, Thin Solid Films, 631: 41, (2017). 12. Zhou F., Xiao C. W., Hong C. W., Ce Z. Z., “Achievements and challenges of CdS/CdTe solar cells”, Int. J. of Photoenergy, 2011: 297350, (2011). 13. JCPDS “Joint Committee on Powder Diffraction Standards” Card No: 89-3011. 14. Bosio A., Romeo N., Mazzamuto S. and Canevari V., “Polycrystalline CdTe thin films for photovoltaic applications”, Prog. Cryst. Growth Charact. Mater., 52: 247-279, (2006). 15. JCPDS “Joint Committee on Powder Diffraction Standards” Card No: 80-0019. 16. JCPDS “Joint Committee on Powder Diffraction Standards” Card No: 89-0440. 17. Zhu X., Chass G.A., Kwek L.C., Rogach, A.L. and Su H., “Excitonic character in optical properties of tetrahedral CdX (X = S, Se, Te) Clusters”, J. Phys. Chem. C, 119: 29171–29177, (2015). 18. Roth A., “Vacuum Technology”, North Holland, Amsterdam, (1980). 19. Warren B.E., “X-ray Diffraction” Addison-Wesley Pub. Co., USA, (1990). 20. Hall B.D., Zanchet D. and Ugarte D., “Estimating nanoparticle size from diffraction measurements” J. Appl. Cryst., 33: 1335-1341, (2000). 21. Matthies S., Priesmeyer H.G. and Daymond M.R., “On the diffractive determination of single-crystal elastic constants using polycrystalline samples”, J. Appl. Cryst. 34: 585-601, (2001). 22. Tauc J., “Optical properties of solids”, North Holland, Amsterdam, (1970). 23. Ferekides C.S., Balasubramanian U., Mamazza R., Viswanathan V., Zhao H. and Morel D.L., “CdTe thin film solar cells: device and technology issues”, Solar Energy 77: 823–830, (2004).