Single junction pin devices have been prepared and are now being optimised. Detailed studies have been carried out on the infrared spectra of amorphous silicon alloys. These data have been analysed to provide an understanding of the bonding of hydrogen and impurities in hydrogenated amorphous silicon films. Further work is continuing on amorphous silicon alloys. Auger electron spectroscopy and X-ray photoemission spectroscopy have been carried out on amorphous silicon alloys and these have provided information about the electronic structure of these materials.
New work is in progress using ultra-pure materials.
Theoretical modelling of the structure of amorphous silicon has enabled us to interpret our data and to examine various hypotheses about photodegradation. This work is directed towards understanding the infrared and XPS data. Studies of the structure and bonding in amorphous silicon alloys. Fabrication of pin solar cells based on amorphous silicon alloys. Optimisation of the performance of amorphous silicon solar cells.