Toward BaSi2/Si Heterojunction Thin-Film Solar Cells
Insights into Heterointerface Investigation, Barium Depletion, and Silicide-Mediated Silicon Crystallization
Yilei Tian (TU Delft - Photovoltaic Materials and Devices)
Ana Bento Montes (Universidade de Lisboa, TU Delft - Photovoltaic Materials and Devices)
Ľubomír Vančo (Slovak University of Technology)
Mária Čaplovičová (Slovak University of Technology)
Peter Vogrinčič (Slovak University of Technology)
Pavol Šutta (University of West Bohemia)
Leonid Satrapinskyy (Comenius University)
Miro Zeman (TU Delft - Electrical Sustainable Energy)
Olindo Isabella (TU Delft - Photovoltaic Materials and Devices)
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Abstract
The knowledge of the structural and compositional details of Si/BaSi2/Si heterostructure annealed at high temperature is a prerequisite for BaSi2 application in heterojunction thin-film solar cells. For this purpose, Si/BaSi2/Si heterostructures deposited by magnetron sputtering with different Si layer thickness are submitted to systematic structural and compositional characterizations. Results reveal a BaSi2/Si heterointerfacial variation caused by surface oxidation and Ba diffusion at the high temperature. Its effects on the optical and electrical properties of Si/BaSi2/Si heterostructure are presented. The outcomes of this work can be extended to BaSi2 deposited by other techniques, and generate substantial advantages in BaSi2 development ranging from improvement on material qualities and eventual deployment in thin-film solar cells.
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