Investigation of Cd1-XMgxTe Alloys for Tandem Solar Cell Applications: Preprint

Research output: Contribution to conferencePaper

Abstract

Theoretical modeling of two-junction tandem solar cells shows that for optimal device performance, the bandgap of the top cell should be in the range of 1.6 to 1.8 eV. Cd1-xMgxTe (CMT) alloys have a lattice constant close to that of CdTe, and the addition of a small amount of Mg changes the bandgap considerably. In this paper, we present our work on developing CMT for solar cell applications. CMTfilms were prepared by vacuum deposition with co-evaporation of CdTe and Mg on substrates heated to 300..deg..- 400 ..deg..C. Films with a composition in the range of x = 0 to 0.66 were fabricated, and optical analysis of the films showed that the bandgap of the samples ranged from 1.5 to 2.3 eV and varied linearly with composition. For the fabrication of devices using these alloy films, we alsoinvestigated the effect of post-depostion CdCl2 heat treatment. We have investigated junctions between CdS and CMT alloys in the bandgap range of 1.5 to 1.8 eV for tandem cell applications. We have also worked on the ohmic contacts to the CMT alloy films using Cu/Au bilayers, and the preliminary data shows a significant effect of the contact processing on the device performance.
Original languageAmerican English
Number of pages6
StatePublished - 2006
Event2006 IEEE 4th World Conference on Photovoltaic Energy Conversion (WCPEC-4) - Waikoloa, Hawaii
Duration: 7 May 200612 May 2006

Conference

Conference2006 IEEE 4th World Conference on Photovoltaic Energy Conversion (WCPEC-4)
CityWaikoloa, Hawaii
Period7/05/0612/05/06

NREL Publication Number

  • NREL/CP-520-39899

Keywords

  • bandgap
  • devices
  • polycrystalline
  • solar cells application
  • two-junction tandem

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