研究目的
To establish the growth conditions and improve the opto-electronic properties of single layer graphene that can be employed in silicon based heterojunction solar cells.
研究成果
Single layer graphene growth recipe for copper foil was established so as to get the optimum optical transmission and sheet resistance values. Combining ITO and graphene films works well as TCE in the Si-based heterojunction solar cell. Presence of graphene on the cell improve the cell efficiency by 8%. This can even be intensified by improving the graphene transfer technique, using cells without breaking and by doping the graphene films that reduces the sheet resistance.
研究不足
The sheet resistance values of the single layer graphene should be lowered further to be used as transparent conductive electrode. The graphene transfer technique could be improved to increase the cell efficiency.
1：Experimental Design and Method Selection:
Graphene growth was conducted with different growth conditions on copper foils in the CVD system to find out the best growth recipe for single layer graphene. The effect of hydrogen and methane flow on the graphene growth was investigated.
2：Sample Selection and Data Sources:
50μm thick double sided copper foil was used as substrate.
3：List of Experimental Equipment and Materials:
A three zone CVD furnace, methane (CH4) and hydrogen (H2) gases, copper foil, acetone, deionized water, isopropanol alcohol, PMMA, glass lamella, Si/SiO2 wafer.
4：Experimental Procedures and Operational Workflow:
The copper foils were pre-cleaned with a standard procedure. The furnace was heated up to 1000 oC for about 40 mins, and then annealed for 30 mins, in addition to another 30 mins. for growth. Following the process, the system was cooled down for a few hours.
5：Data Analysis Methods:
Light microscopy for topographic, Raman spectroscopy for the structural, ellipsometry for the optical, and four-point probe for the electrical characterizations were employed.
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