研究目的
Investigating the performance of graphene-on-silicon Schottky solar cells with innovative graphite contacts compared to standard Ti/Au bilayer contacts.
研究成果
The innovative graphite contacts significantly improve the performance of graphene-on-silicon solar cells, achieving higher fill factors and more regular impedance spectra compared to standard gold contacts. This suggests graphite contacts as a promising alternative for high-performance, cost-effective solar cells.
研究不足
The study focuses on the comparison between graphite and gold contacts without exploring other potential contact materials or configurations. The impedance spectroscopy analysis, while insightful, requires careful interpretation to link observed impedance with specific device regions.
1：Experimental Design and Method Selection:
The study compares the performance of graphene-on-silicon solar cells with graphite contacts versus standard Ti/Au bilayer contacts using current-voltage characteristics under dark and illumination conditions, external quantum efficiency, and impedance spectroscopy.
2：Sample Selection and Data Sources:
Multi-layers graphene films were grown by CVD of ethanol on Cu substrates and transferred onto polished Si substrates.
3：List of Experimental Equipment and Materials:
CVD apparatus, Renishaw inVia Reflex Raman spectrometer, Keithley 236 electrometer, Keithley 228a voltage/current source, HP 3478A measurement unit, WACOM class AAA solar simulator, Bentham PVE300 apparatus.
4：Experimental Procedures and Operational Workflow:
Graphene films were transferred onto Si substrates, and two types of top contacts were realized (gold deposition and colloidal graphitic glue). Solar cells were characterized under various conditions.
5：Data Analysis Methods:
Impedance spectroscopy analysis was used to compare the electrical behavior of solar cells with different contacts, interpreted through an equivalent circuit model.
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