Realizing a facile and environmental-friendly fabrication of high-performance multi-crystalline silicon solar cells by employing ZnO nanostructures and an Al2O3 passivation layer
| Autor: | Xinming Ji, Hongyan Chen, Shi-Jin Ding, Long Sun, Hong-Liang Lu, David Wei Zhang, Qing-Hua Ren, Hao Zhang, Wen-Jun Liu, Xiao-Feng Yang |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Multidisciplinary Materials science Passivation Silicon business.industry chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Article law.invention Monocrystalline silicon Atomic layer deposition Solar cell efficiency chemistry law Etching (microfabrication) 0103 physical sciences Solar cell Optoelectronics Crystalline silicon 0210 nano-technology business |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/srep38486 |
| Popis: | Nowadays, the multi-crystalline silicon (mc-Si) solar cells dominate the photovoltaic industry. However, the current acid etching method on mc-Si surface used by firms can hardly suppress the average reflectance value below 25% in the visible light spectrum. Meanwhile, the nitric acid and the hydrofluoric contained in the etching solution is both environmental unfriendly and highly toxic to human. Here, a mc-Si solar cell based on ZnO nanostructures and an Al2O3 spacer layer is demonstrated. The eco-friendly fabrication is realized by low temperature atomic layer deposition of Al2O3 layer as well as ZnO seed layer. Moreover, the ZnO nanostructures are prepared by nontoxic and low cost hydro-thermal growth process. Results show that the best passivation quality of the n+ -type mc-Si surface can be achieved by balancing the Si dangling bond saturation level and the negative charge concentration in the Al2O3 film. Moreover, the average reflectance on cell surface can be suppressed to 8.2% in 400–900 nm range by controlling the thickness of ZnO seed layer. With these two combined refinements, a maximum solar cell efficiency of 15.8% is obtained eventually. This work offer a facile way to realize the environmental friendly fabrication of high performance mc-Si solar cells. |
| Databáze: | OpenAIRE |
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