研究目的
To study the AC electrical response of standard-thick, ultrathin and passivated ultrathin Cu(In,Ga)Se2 (CIGS) solar cells and understand the differences between them.
研究成果
The AC equivalent circuit for an ultrathin CIGS device is simpler than the one for a standard thick CIGS device, possibly due to lower bulk recombination in ultrathin devices. The passivation layer at the rear contact of the solar cell increases the shunt resistance, demonstrating its importance for shunts mitigation. The study confirms that standard thick CIGS solar cells are mostly limited by bulk recombination and suggests that reducing the absorber layer thickness while using an appropriate passivation layer could overcome this problem.
研究不足
The study is limited by the control of all possible parameters that affect the measurements and the need to perform all intended measurements approximately at the same time. The difference between calculated and experimental values for the passivation layer capacitance could be explained by the fact that the device passivation layer has point contacts in approximately 3 % of the area.
1：Experimental Design and Method Selection:
The study involved AC electrical measurements to understand the effects on device performance of lowering the CIGS thickness and using a dielectric on the rear contact as a passivation layer. Three devices were studied: a standard 2000 nm thick CIGS solar cell, a 400 nm ultrathin CIGS solar cell, and a rear passivated 400 nm ultrathin CIGS solar cell.
2：Sample Selection and Data Sources:
The solar cell stack is SLG/Mo/CIGS/CdS/i:ZnO/ZnO:Al with Ni/Al/Ni. For the ultrathin passivated device, a nanostructured Al2O3 layer was employed between the Mo and the CIGS.
3：List of Experimental Equipment and Materials:
A precision LCR meter (Agilent E4890 A) was used for capacitance–conductance–frequency measurements.
4：Experimental Procedures and Operational Workflow:
Measurements were performed at room temperature, 25 mV (VRMS), 0 Vbias with a range of frequencies varying from 20 Hz to 1 MHz. Prior to the AC measurements, light soaking at AM
5：5 during 20 minutes with cooling of the substrate to 20 oC was performed. Data Analysis Methods:
The AC electrical behavior of the solar cells was modeled using ZSimpWin 3.50 software.
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