Co-sublimation of CdSexTe1−x layers for CdTe solar cells
| Autor: | Walajabad S. Sampath, Drew E. Swanson, James R. Sites |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Band gap business.industry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cadmium telluride photovoltaics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystallinity Wavelength chemistry Physical vapor deposition Optoelectronics Sublimation (phase transition) Quantum efficiency 0210 nano-technology business Selenium |
| Zdroj: | Solar Energy Materials and Solar Cells. 159:389-394 |
| ISSN: | 0927-0248 |
| DOI: | 10.1016/j.solmat.2016.09.025 |
| Popis: | CdTe thin film solar cells have demonstrated efficiencies over 20%, but CdTe has a somewhat higher band gap than optimal for single-junction terrestrial solar-cell power generation. A reduction in the band gap could therefore result in an overall improvement in performance. To reduce the band gap, selenium was alloyed with CdTe using a novel co-sublimation extension of the close-space-sublimation process. Co-sublimated layers of CdSeTe with various selenium concentrations were characterized for optical absorption and atomic concentrations, as well as to track changes in their morphology and crystallinity. The lower band-gap CdSeTe films were then incorporated into the front of CdTe cells. This two-layer band-gap structure demonstrated higher current collection and increased quantum efficiency at longer wavelengths. |
| Databáze: | OpenAIRE |
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