Carrier-Transport Imaging of Cadmium Telluride Intra- and Inter-Grains
| Autor: | Mowafak Al-Jassim, Helio Moutinho, Kevin Blaine, Chun-Sheng Jiang, John Moseley, Chuanxiao Xiao, Nancy M. Haegel, Clyde L. Scandrett |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Cathodoluminescence 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Cadmium telluride photovoltaics law.invention law 0103 physical sciences Solar cell Grain boundary Diffusion (business) Thin film 0210 nano-technology Luminescence Electron backscatter diffraction |
| Zdroj: | 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC). |
| DOI: | 10.1109/pvsc.2018.8548011 |
| Popis: | Inhomogeneous local minority-carrier transport in thin-film solar cells is a critical aspect for the device operation. In this work, we applied a transport imaging (TI) technique to the intra- and inter-grain carrier-transport properties of cadmium telluride (CdTe) solar cell materials. We compared the TI results with cathodoluminescence and electron backscatter diffraction (EBSD) on the same CdTe thin film. The diffusion lengths of two distinct grain interiors were measured directly, and the values are significantly different. Three types of grain boundaries (GBs) determined by EBSD were studied by TI, and they have different decays, suggesting that different GB structure can be responsible for carrier-transport properties. Further, we did a 2D analytical simulation of carrier diffusion across GBs with varying GB lifetimes. The results suggest that GB lifetimes affect the carrier transport. Comparison of multiple technique results, together with numerical simulation, provides a deeper understanding of carrier-transport properties. |
| Databáze: | OpenAIRE |
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