研究目的
Investigating the mitigation of ternary element loss during CdCl2 treatment in Cd1-xMgxTe and Cd1-xZnxTe alloys for tandem photovoltaic applications.
研究成果
The study demonstrated that providing a simultaneous pressure of ZnCl2 alongside CdCl2 reduces Zn loss from CdZnTe absorbers under specific conditions, suggesting a potential method for mitigating ternary element loss in tandem photovoltaic applications. However, similar effects were not observed with MgCl2 in CdMgTe, indicating the need for further research into the underlying loss mechanisms.
研究不足
The study was limited by the inability to achieve a MgCl2-rich ratio sufficient to examine its effect on reducing loss in CdMgTe, similar to the effect observed with ZnCl2 in CdZnTe. Additionally, the true loss reaction may differ from the assumed reaction, suggesting the need for further investigation into plausible loss reactions.
1：Experimental Design and Method Selection:
The study involves co-passivation of wide-bandgap absorbers with CdCl2 and MgCl2 or ZnCl2, using independent control of each chloride’s source temperature to vary vapor pressures.
2：Sample Selection and Data Sources:
Samples consisted of TEC 10 glass with pre-deposited layers, MgZnO, and CdMgTe or CdZnTe alloys.
3：List of Experimental Equipment and Materials:
Modified close-space sublimation process for alloy deposition, RF sputter process for MgZnO deposition, and co-sublimation deposition hardware for mixed-chloride passivation.
4：Experimental Procedures and Operational Workflow:
Substrates were preheated and then exposed to chloride vapor in a vacuum chamber, followed by transmittance measurements to assess ternary element loss.
5：Data Analysis Methods:
Optical transition values were calculated from transmittance measurements to quantify shifts in the band edge.
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