Double-layered Ag-Al back reflector on stainless steel substrate for a Si:H thin film solar cells
| Autor: | Jung Wook Lim, Moojin Kim, Kyu-Sung Lee, Kyoung-Bo Kim, Ruud E. I. Schropp, Kwang Hoon Jung, Sun Jin Yun, Yoo Jeong Lee, Seong Hyun Lee |
|---|---|
| Přispěvatelé: | Plasma & Materials Processing |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Amorphous silicon
Materials science Silver Alloy chemistry.chemical_element 02 engineering and technology Substrate (electronics) Surface finish engineering.material 01 natural sciences Light scattering a-Si:H solar cell chemistry.chemical_compound Aluminium 0103 physical sciences Composite material 010302 applied physics Back reflector Renewable Energy Sustainability and the Environment Metallurgy Energy conversion efficiency 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry engineering Crystallite 0210 nano-technology Aluminum |
| Zdroj: | Solar Energy Materials and Solar Cells, 145(3), 368-374. Elsevier |
| ISSN: | 0927-0248 |
| Popis: | An effective light trapping method for substrate-type hydrogenated amorphous silicon (a-Si:H) thin film solar cells is the use of a back reflector (BR) of high roughness, e.g., ‘hot silver’, which is deposited at temperatures higher than 450 °C. In this work, textured silver-aluminum (Ag–Al) BR films were fabricated by depositing Ag on Al film at Ag-deposition temperatures ( T Ag ) ranging from 25 to 350 °C. The surface morphology and roughness of Ag–Al films were strongly affected by T Ag . The Al and Ag films were formed entirely of Ag 2 Al alloy at T Ag of 330 °C or higher, while the Ag–Al films maintained a double-layered structure at 290 °C or below. Although the films did not undergo alloying at T Ag of 290 °C, the Ag–Al films have a well-developed surface structure with high diffuse-reflectance, compared to Ag films deposited at the same temperature. The conversion efficiency of an a-Si:H thin film solar cell on a flexible stainless steel substrate increased from 7.63% to 8.44% as T Ag was increased from 25 to 290 °C, as a result of more effective light scattering by Ag–Al BRs, producing increased short-circuit current. However, at higher T Ag , Ag 2 Al alloy films with sharp crystallite edges were formed, and were not appropriate as BRs. The present work clearly shows that double-layered Ag–Al films fabricated at temperatures as low as 290 °C could be useful back reflectors for substrate-type thin film solar cells. |
| Databáze: | OpenAIRE |
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