研究目的
Investigating the properties of As-doped polycrystalline ZnTe layers as a back contact for CdTe solar cells, focusing on conductivity, doping efficiency, and the impact on photovoltaic performance.
研究成果
The study demonstrated that As-doped ZnTe layers can serve as effective back contacts for CdTe solar cells, with high p-type carrier densities achievable. Post-deposition treatments, including a mild CdCl2 activation process with a CdS cap, were shown to mitigate Zn loss and improve device performance, highlighting the importance of back contact activation.
研究不足
The study faced challenges with Zn loss during standard CdCl2 heat treatment, necessitating the development of a milder treatment with a sacrificial CdS cap layer. The effectiveness of this approach was limited by residual Zn loss and the need for further optimization.
1：Experimental Design and Method Selection:
The study involved the growth of As-doped polycrystalline ZnTe layers by metalorganic chemical vapor deposition (MOCVD) and their incorporation into CdTe solar cells. The electrical and optical properties of these layers were investigated, along with their impact on solar cell performance.
2：Sample Selection and Data Sources:
Samples included undoped and As-doped ZnTe thin films on boro-aluminosilicate glass substrates and CdTe solar cells with ZnTe:As back contacts.
3：List of Experimental Equipment and Materials:
Equipment included a horizontal atmospheric pressure (AP)-MOCVD reactor, Hall-effect measurement setup, transmittance measurement setup, and solar simulator for J-V measurements. Materials included dimethylcadmium (DMCd), diisopropyltelluride (DIPTe), diethylzinc (DEZn), and tertiarybutylchloride (tBuCl) as metalorganic precursors, and tris(dimethylamino)arsenic (tDMAAs) for As doping.
4：Experimental Procedures and Operational Workflow:
The process involved the deposition of ZnTe:As layers, characterization of their properties, incorporation into CdTe solar cells, and evaluation of cell performance with and without post-deposition treatments.
5：Data Analysis Methods:
Data analysis included Hall-effect measurements for electrical properties, transmittance spectra for optical properties, and J-V measurements for photovoltaic performance.
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