A photovoltaic cell was produced by depositing a 1 mu m thick layer of
a-cBN doped with S on a p-type Si wafer, using a pulse plasma generat
or of special construction which allowed coverage of large areas with
a layer of uniform thickness. The heterojunction showed a photovoltaic
effect by illuminating with a c.w. lamp with a filament temperature o
f 2300 K. The photovoltaic voltage was 0.25 V and the photoresponse cu
rve was asymmetric.