CdSxTe1-x Alloying in CdS/CdTe Solar Cells

Joel N. Duenow, Ramesh G. Dhere, Helio R. Moutinho, Bobby To, Joel W. Pankow, Darius Kuciauskas, Timothy A. Gessert

Research output: Contribution to conferencePaperpeer-review

6 Scopus Citations


A CdS xTe 1-x layer forms by interdiffusion of CdS and CdTe during the fabrication of thin-film CdTe photovoltaic (PV) devices. The CdS xTe 1-x layer is thought to be important because it relieves strain at the CdS/CdTe interface that would otherwise exist due to the 10% lattice mismatch between these two materials. Our previous work [1] has indicated that the electrical junction is located in this interdiffused CdS xTe 1-x region. Further understanding, however, is essential to predict the role of this CdS xTe 1-x layer in the operation of CdS/CdTe devices. In this study, CdS xTe 1-x alloy films were deposited by radio-frequency magnetron sputtering and co-evaporation from CdTe and CdS sources. Both radio-frequency-magnetron-sputtered and co-evaporated CdS xTe 1-x films of lower S content (x<0.3) have a cubic zincblende (ZB) structure akin to CdTe, whereas those of higher S content have a hexagonal wurtzite (WZ) structure like that of CdS. Films become less preferentially oriented as a result of a CdCl 2 heat treatment at ∼400°C for 5 min. Films sputtered in a 1% O 2/Ar ambient are amorphous as deposited, but show CdTe ZB, CdS WZ, and CdTe oxide phases after a CdCl 2 heat treatment. Films sputtered in O 2 partial pressure have a much wider bandgap than expected. This may be explained by nanocrystalline size effects seen previously [2] for sputtered oxygenated CdS (CdS:O) films.

Original languageAmerican English
Number of pages6
StatePublished - 2012
Event2011 MRS Spring Meeting - San Francisco, CA, United States
Duration: 25 Apr 201129 Apr 2011


Conference2011 MRS Spring Meeting
Country/TerritoryUnited States
CitySan Francisco, CA

NREL Publication Number

  • NREL/CP-5200-51737

Other Report Number

  • Paper No. 1324-D14-03


  • CdTe photovoltaic
  • PV
  • solar
  • thin film


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