Patent ID: 7091411

Claim:
Multicrystalline laser crystallized silicon thin film solar cell on a glass substrate (a), configured for illumination from the substrate side, comprising: a laser crystallized multicrystalline silicon layer (b 1 ,b 2 ) being at least 2 μm thick whose first lower layer region (b 1 ) which is situated on the substrate (a) and serves as seed layer and transparent electrode as well, is p-doped, and whose second layer region (b 2 ) opposite from the substrate is epitaxially crystallized on said seed layer, has a lower p-doping in comparison to the seed layer and serves as absorber layer, wherein the lateral edge size of the crystallites in the multicrystalline layer (b 1 ,b 2 ) exceeds the thickness of this layer and wherein the grain boundaries of the crystallites extend throughout said layer (b 1 ,b 2 ); a laser crystallized n-doped silicon layer (c) which is provided above said silicon layer (b 1 , b 2 ) and which serves as an emitter; and a reflecting contact layer (Al) as an upper electrode on top of the emitter layer (c).