Optimization of Graded Bandgap Cd1-xZnxTe Thin Film Solar Cells from Numerical Analysis

M. N. Imamzai, M. A. Islam, M. J. Rashid, T. H. Chowdhury, M. M. Alam, Zeid A. Alothman, Kamaruzzaman Sopian, Nowshad Amin

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Solar cells based on CdTe have reached a maximum practical recorded efficiency of 20.4%, which is low compared to its theoretical limit (29%). Novel concepts are required to further increase the efficiency of CdTe based solar cells. One possible approach is the graded bandgap CdZnTe solar cells. The commercial CdTe solar cells usually have thicker absorber layer. However, by using graded bandgap CdZnTe the absorber layer thickness can be reduced significantly, which eventually will reduce the cost, save processing time and energy required for fabrication. In this work, numerical simulation on graded bandgap CdZnTe solar cells is carried out by AMPS-1D software. The absorber layer of graded bandgap CdZnTe solar cells are optimized by two approaches (A and B), where each approach has four optimized structures. Finally, one optimized cell structure is selected for each approach. The results of the best cells for approach A and B are Voc= 0.884 Volt, Jsc= 32.074 mA/cm2, FF= 0.801, Efficiency = 20.66% and Voc= 0.887 Volt, Jsc= 32.021 mA/cm2, FF= 0.788, Efficiency = 20.35%, respectively. These cells have good stability at higher operating temperature, which are -0.043%/oC for the best cell of approach A and -0.038%/oC for the best cell of approach B. The best cells are also analyzed in terms of window layer thicknesses. It is found that by increasing the thickness of CdS window layer the efficiency decreases due to reduction of Jsc. Additionally, it is found that efficiency further increases for the insertion of a ZnO buffer layer.

Original languageEnglish
Pages (from-to)541-551
Number of pages11
JournalChalcogenide Letters
Volume11
Issue number11
Publication statusPublished - 29 Oct 2014

Fingerprint

numerical analysis
Numerical analysis
Solar cells
Energy gap
solar cells
optimization
thin films
cells
absorbers
AMPS (satellite payload)
Buffer layers
operating temperature
Thin film solar cells
insertion
buffers
costs
computer programs
Fabrication
fabrication
CdZnTe

Keywords

  • AMPS 1-D
  • CdZnTe Thin Film Solar Cells
  • Optimization
  • Ultra-thin Film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Imamzai, M. N., Islam, M. A., Rashid, M. J., Chowdhury, T. H., Alam, M. M., Alothman, Z. A., ... Amin, N. (2014). Optimization of Graded Bandgap Cd1-xZnxTe Thin Film Solar Cells from Numerical Analysis. Chalcogenide Letters, 11(11), 541-551.

Optimization of Graded Bandgap Cd1-xZnxTe Thin Film Solar Cells from Numerical Analysis. / Imamzai, M. N.; Islam, M. A.; Rashid, M. J.; Chowdhury, T. H.; Alam, M. M.; Alothman, Zeid A.; Sopian, Kamaruzzaman; Amin, Nowshad.

In: Chalcogenide Letters, Vol. 11, No. 11, 29.10.2014, p. 541-551.

Research output: Contribution to journalArticle

Imamzai, MN, Islam, MA, Rashid, MJ, Chowdhury, TH, Alam, MM, Alothman, ZA, Sopian, K & Amin, N 2014, 'Optimization of Graded Bandgap Cd1-xZnxTe Thin Film Solar Cells from Numerical Analysis', Chalcogenide Letters, vol. 11, no. 11, pp. 541-551.
Imamzai MN, Islam MA, Rashid MJ, Chowdhury TH, Alam MM, Alothman ZA et al. Optimization of Graded Bandgap Cd1-xZnxTe Thin Film Solar Cells from Numerical Analysis. Chalcogenide Letters. 2014 Oct 29;11(11):541-551.
Imamzai, M. N. ; Islam, M. A. ; Rashid, M. J. ; Chowdhury, T. H. ; Alam, M. M. ; Alothman, Zeid A. ; Sopian, Kamaruzzaman ; Amin, Nowshad. / Optimization of Graded Bandgap Cd1-xZnxTe Thin Film Solar Cells from Numerical Analysis. In: Chalcogenide Letters. 2014 ; Vol. 11, No. 11. pp. 541-551.
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abstract = "Solar cells based on CdTe have reached a maximum practical recorded efficiency of 20.4{\%}, which is low compared to its theoretical limit (29{\%}). Novel concepts are required to further increase the efficiency of CdTe based solar cells. One possible approach is the graded bandgap CdZnTe solar cells. The commercial CdTe solar cells usually have thicker absorber layer. However, by using graded bandgap CdZnTe the absorber layer thickness can be reduced significantly, which eventually will reduce the cost, save processing time and energy required for fabrication. In this work, numerical simulation on graded bandgap CdZnTe solar cells is carried out by AMPS-1D software. The absorber layer of graded bandgap CdZnTe solar cells are optimized by two approaches (A and B), where each approach has four optimized structures. Finally, one optimized cell structure is selected for each approach. The results of the best cells for approach A and B are Voc= 0.884 Volt, Jsc= 32.074 mA/cm2, FF= 0.801, Efficiency = 20.66{\%} and Voc= 0.887 Volt, Jsc= 32.021 mA/cm2, FF= 0.788, Efficiency = 20.35{\%}, respectively. These cells have good stability at higher operating temperature, which are -0.043{\%}/oC for the best cell of approach A and -0.038{\%}/oC for the best cell of approach B. The best cells are also analyzed in terms of window layer thicknesses. It is found that by increasing the thickness of CdS window layer the efficiency decreases due to reduction of Jsc. Additionally, it is found that efficiency further increases for the insertion of a ZnO buffer layer.",
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