Impact of NaF during chloride treatment of CdTe solar cells
| Autor: | Thomas P. Shalvey, Jonathan D. Major |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Dopant Mechanical Engineering Sodium Inorganic chemistry chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Chloride Acceptor Cadmium telluride photovoltaics chemistry Mechanics of Materials Sputtering 0103 physical sciences medicine Chlorine General Materials Science Sublimation (phase transition) 0210 nano-technology medicine.drug |
| Zdroj: | MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING |
| Popis: | Sodium has shown promise as a p-type dopant in CdTe solar cells but reports of increased acceptor concentrations are typically accompanied by adverse structural and morphological changes. Here we show that these changes, which occur upon chlorine activation in the presence of sodium, are dependent upon the initial grain structure. We find that small grain CdTe films deposited by sputtering undergo extensive recrystallisation following MgCl2 treatment, whereas large grain CdTe deposited by close space sublimation (CSS) do not. This allowed the effect of NaF on device performance to be studied, which is shown to strongly enhance CdS–CdTe intermixing. This results in lower efficiencies due to inferior junction quality, without any clear change in acceptor concentration. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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