期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 231, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.solmat.2021.111325
关键词
CdTe; CdSe; Cd(Se,Te); Thin film; As doping; MOCVD; Solar cells; Photovoltaics
资金
- European Regional Development Fund (ERDF)
- Welsh European Funding Office (WEFO)
- Engineering and Physical Science Research Council [EP/N020863/1]
- Innovate UK [920036]
- European Regional Development Fund through the Welsh Government [c80892]
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Office [34353]
- U.S.Department of Defence Office of Naval Research [IAG-16-02002]
- Engineering and Physical Sciences Research Council [EP/W00092X/1] Funding Source: researchfish
Recent developments in CdTe solar cell technology have involved the use of ternary alloy Cd(Se,Te) in devices, which helps enhance current density and improve device performance. The incorporation of Cd(Se,Te) polycrystalline thin films in CdTe solar cells has been explored, with focus on the compositional dependence of crystal structure and optical properties. The formation of a graded Se profile and back-diffusion of dopants have been confirmed, with in situ As doping of the Cd(Se,Te) layer showing potential for improving device junction quality.
Recent developments in CdTe solar cell technology have included the incorporation of ternary alloy Cd(Se,Te) in the devices. CdTe absorber band gap grading due to Se alloying contributes to current density enhancement and can result in device performance improvement. Here we report Cd(Se,Te) polycrystalline thin films grown by a chamberless inline atmospheric pressure metal organic chemical vapour deposition technique, with subsequent incorporation in CdTe solar cells. The compositional dependence of the crystal structure and optical properties of Cd(Se,Te) are examined. Selenium graded Cd(Se,Te)/CdTe absorber structure in devices are demonstrated using either a single CdSe layer or CdSe/Cd(Se,Te) bilayer (with or without As doping in the Cd(Se,Te) layer). Cross-sectional TEM/EDS, photoluminescence spectra and secondary ion mass spectroscopy analysis confirmed the formation of a graded Se profile toward the back contact with a diffusion length of similar to 1.5 mu m and revealed back-diffusion of Group V (As) dopants from the CdTe layer into Cd(Se,Te) grains. Due to the strong Se/Te interdiffusion, CdSe in the Se bilayer configuration was unable to form an n-type emitter layer in processed devices. In situ As doping of the Cd(Se,Te) layer benefited the device junction quality with current density reaching 28.3 mA/cm(2). The results provide useful insights for the optimisation of Cd(Se,Te)/CdTe solar cells.
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