Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Further analysis of aluminum alloying for the formation of p+ regions in silicon solar cells
Ist Teil von
Energy procedia, 2011, Vol.8, p.200-206
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2011
Quelle
Elsevier ScienceDirect Journals Collection
Beschreibungen/Notizen
We present a detailed study on the formation of full-area screen-printed aluminum-alloyed p+ emitters and back surface fields for n- and p-type silicon solar cells, respectively. We have investigated the structural properties of agglomerated Al-doped p+ Si regions which exhibit serious lateral thickness inhomogeneities. We refined an existing simple model based on wetting phenomena for the formation of agglomerated Al-p+ regions. According to the model, the thickness inhomogeneities are caused by the contraction of the Al-Si melt during alloying, leading to enhanced and decelerated Si recrystallization in the regions of melt accumulation and depletion, respectively. Furthermore, we demonstrate that the melt contraction can be delayed by carefully choosing adequate alloying conditions. In particular, agglomerations are avoided by increasing the printed Al paste amount or decreasing the peak temperature time or peak temperature, thus enabling a more flexible fabrication of Si solar cells with Al-alloyed rear side.