%0 Journal Article
%T Performance potential of low-defect density silicon thin-film solar cells obtained by electron beam evaporation and laser crystallisation
%A Dore J.
%A Varlamov S.
%A Evans R.
%A Eggleston B.
%J EPJ Photovoltaics
%D 2013
%I EDP Sciences
%R 10.1051/epjpv/2012012
%X A few microns thick silicon films on glass coated with a dielectric intermediate layer can be crystallised by a single pass of a line-focused diode laser beam. Under favorable process conditions relatively large linear grains with low defect density are formed. Most grain boundaries are defect-free low-energy twin-boundaries. Boron-doped laser crystallised films are processed into solar cells by diffusing an emitter from a phosphorous spin-on-dopant source, measuring up to 539 mV open-circuit voltage prior to metallisation. After applying a point-contact metallisation the best cell achieves 7.8% energy conversion efficiency, open-circuit voltage of 526 mV and short-circuit current of 26 mA/cm2. The efficiency is significantly limited by a low fill-factor of 56% due to the simplified metallisation approach. The internal quantum efficiency of laser crystallised cells is consistent with low front surface recombination. By improving cell metallisation and enhancing light-trapping the efficiencies of above 13% can be achieved.
%U http://dx.doi.org/10.1051/epjpv/2012012