Journal article

The role of CdCl2 treatments and annealing in the formation of sintered CdTe nanocrystal solar cells

G Jain, A Ahnood, A Chanaewa, K Fox, P Mulvaney



Solution processing of CdTe nanocrystals is a promising approach for the fabrication of low cost photovoltaic devices at low process temperatures. However despite the inherent advantages of this approach, the nanoscale physical mechanisms underlying the fabrication process are not well understood. Here we demonstrate that chemical treatment of CdTe nanoparticles leads to the production of a deep valence band edge. However, the removal of ligands also introduces sizable quantities of excess oxygen into the films in the form of TeO2, as proved by XPS. Thermal annealing of the CdTe films in air removes this excess oxygen and the TeO2 signal. Annealing further increases the energy of the valence..

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Awarded by ARC

Funding Acknowledgements

The authors acknowledge Jegadesan Subbiah for assistance with aluminium evaporation and Jacek Jasieniak, Anthony Chesman, and CSIRO for the use of the PESA. The authors also acknowledge access to the Australian Microscopy and Microanalysis Research Facility at RMIT University. Gautam Jain thanks the University of Melbourne for support through an MFRS scholarship and PhD stipend. Paul Mulvaney thanks the ARC for support through ARC grants DP160104575 and CE170100026. Alina Chenaewa thanks Stefan Glunz and the Fraunhofer ISE in Freiburg (Germany) for support.