研究目的
Investigating the correlation between Urbach energy (EU) and open-circuit voltage deficit (VOC,def) in flexible Cu(In,Ga)Se2 (CIGSe) solar cells on stainless steel (SUS) substrates to improve photovoltaic performance.
研究成果
The study concludes that EU is a reliable indicator of CIGSe quality and correlates well with VOC,def. Optimizing GGI and TSUB, along with minimizing Fe concentration, reduces EU and VOC,def, leading to improved photovoltaic performance. A high η of 17.9% was achieved for flexible CIGSe solar cells on SUS substrates.
研究不足
The study is limited by the technical constraints of controlling GGI, TSUB, and Fe concentration precisely. Potential areas for optimization include further reducing Fe concentration and optimizing GGI and TSUB for even lower EU and VOC,def.
1：Experimental Design and Method Selection:
The study involves the fabrication of CIGSe solar cells on both soda-lime glass (SLG) and SUS substrates with variations in GGI, TSUB, and Fe concentration to investigate their effects on EU and VOC,def.
2：Sample Selection and Data Sources:
CIGSe films are prepared with varying GGI, TSUB, and Fe concentrations. Data on photovoltaic performance, EQE, and TRPL carrier lifetimes are collected.
3：List of Experimental Equipment and Materials:
Equipment includes energy dispersive spectroscopy, dynamic-secondary ion mass spectroscopy, TRPL measurement system, and EQE measurement system. Materials include CIGSe absorbers, CdS buffer layers, ZnO window layers, and ITO transparent conductive oxide layers.
4：Experimental Procedures and Operational Workflow:
The process involves substrate preparation, CIGSe deposition, buffer and window layer deposition, and photovoltaic parameter evaluation.
5：Data Analysis Methods:
Data analysis includes determining EU from EQE spectra, analyzing TRPL decay curves for carrier lifetimes, and correlating EU with VOC,def.
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