研究目的
To fabricate a flexible and bifacial Cu(In,Ga)Se2 (CIGS) solar cell with a superstrate-type structure using a lift-off process, focusing on the development of a suitable back contact and the realization of ohmic-like characteristics at the CIGS/back contact interface.
研究成果
The flexible and bifacial CIGS solar cell with a superstrate-type structure was successfully fabricated using a lift-off process, achieving conversion efficiency values of 6.2% for frontside illumination and 0.9% for backside illumination. The study demonstrates the practicality of using a bilayer of ultra-thin Au/AZO as the back contact and highlights the potential for further improvements in solar cell performance.
研究不足
The study acknowledges the incomplete ohmic-like characteristic at the CIGS/back contact interface, which affects the solar cell's performance. Future work is suggested to reduce the resistance of the back contact and passivate the rear surface of the CIGS to improve efficiency.
1：Experimental Design and Method Selection:
The study utilized a lift-off process to fabricate a flexible and bifacial CIGS solar cell with a superstrate-type structure. The process allowed for the deposition of the CIGS layer under high temperature and the use of ETFE as a superstrate.
2：Sample Selection and Data Sources:
The CIGS absorbers were deposited on Mo-coated SLG substrates by multi-source thermal evaporation. The final material composition ratios were measured by energy-dispersive X-ray spectroscopy (EDX).
3：List of Experimental Equipment and Materials:
Equipment included an electron beam (EB) evaporation system for Au deposition, RF magnetron sputtering for AZO deposition, and a UV-visible-near-infrared spectrophotometer for optical property measurements. Materials included ETFE film, epoxy glue, and various layers for the solar cell structure.
4：Experimental Procedures and Operational Workflow:
The process involved adhering ETFE film to the substrate-type CIGS solar cell, cleaving layers from the Mo/SLG substrate, and depositing the bilayer of ultra-thin Au/AZO as the back contact.
5：Data Analysis Methods:
The optical and electrical properties of the back contact were analyzed using spectrophotometry and Hall-effect measurements, respectively. The photovoltaic performance was evaluated through current density-voltage (J-V) curves and external quantum efficiencies (EQE) measurements.
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