Efficiency Boosting Approaches for Photovoltaic Technology
Date Issued
2009
Date
2009
Author(s)
Pollos, Enrique Encinas
Abstract
In the present document, three different initiatives taken on behalf of efficiency improvement of wafer based solar cells are presented. First, MIS Solar cells are theoretically analyzed and the outcome is verified by means of TCAD simulation software. Al/SiO2/ptype Si and ITO/SiO2/nType Si devices are constructed and tested obtaining negative results that discard the utilization of transparent conductive oxides as promising contact materials for MIS solar cells. he influence of front surface recombination on solar cell behavior is examined and an improvement methodology for this parameter by means of PIII technology is derived. PIII acts as a passivation method that tends to decrease the surface defects and hence decreases the surface recombination velocity. Experimental results reflect an efficiency increase of 16%. inally the impact of mechanically induced strain on solar cells is studied and modeled by software means. Results reveal a reduction in the semiconductor bandgap and a modification of the carrier mobilities that are translated into a 1.5% efficiency augmentation.
Subjects
Solar cells
Efficiency
Metal Insulator Semiconductor
Plasma Immersion Ion Implantation
Strain
Biaxial
Surface Recombination
SDGs
Type
thesis
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