The performance of amorphous silicon solar cells has improved steadily over the last several years, and recently conversion efficiencies as high as 10.1% have been achieved at RCA Laboratories. This increase in performance is partly due to an improvement in the quality of undoped amorphous silicon and partly due to the development of new doped amorphous silicon alloys. We project that the conversion efficiencies will continue to improve and that single junction amorphous silicon solar cells will attain efficiencies in the 12 to 14% range within the next few years.
D. E. Carlson,
"Progress In Amorphous Silicon Photovoltaics", Proc. SPIE 0407, Photovoltaics for Solar Energy Applications II, (8 September 1983); doi: 10.1117/12.935680; https://doi.org/10.1117/12.935680