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[20p-P14-10] Fabrication of Cu2ZnGeS4 Thin Film Solar Cells Using Spray Pyrolysis Method
Keywords:CZGS,Spray Pyrolysis,Solar Cell
A Cu2ZnGeS4 (CZGS) compound is one of the promising photoabsorber materials for photovoltaic applications because it consists of abundant and non-toxic elements. Furthermore, the compound has a high absorption coefficient (>104 cm-1) and an ideal wide band gap (> 2.0 eV) for a top-cell of a highly efficient tandem solar cell. However, there has been no example of successful fabrication of pure CZGS-based device.
Among various methods to fabricate a CZGS thin film, spray pyrolysis is one of most cost-effective fabrication techniques because of its possible operation in an ambient pressure (i.e., without requirement of a high-vacuum condition). Moreover, the method is advantageous for its easiness to adjust composition of the film: films with a wide range of compositions can be prepared by just varying the concentrations of constituents in the spray solution. In this study, I successfully obtained a device-quality pure CZGS film by applying the spray pyrolysis method for the first time.
Among various methods to fabricate a CZGS thin film, spray pyrolysis is one of most cost-effective fabrication techniques because of its possible operation in an ambient pressure (i.e., without requirement of a high-vacuum condition). Moreover, the method is advantageous for its easiness to adjust composition of the film: films with a wide range of compositions can be prepared by just varying the concentrations of constituents in the spray solution. In this study, I successfully obtained a device-quality pure CZGS film by applying the spray pyrolysis method for the first time.