Magnesium Fluoride Electron-Selective Contacts for Crystalline Silicon Solar Cells
| Autor: | Di Yan, Chris Samundsett, Josephine McKeon, Peiting Zheng, James Bullock, Andres Cuevas, Ali Javey, Mark Hettick, Thomas Allen, Xinyu Zhang, Jie Cui, Yimao Wan |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Amorphous silicon Magnesium fluoride Materials science Silicon business.industry Inorganic chemistry chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Polymer solar cell law.invention chemistry.chemical_compound chemistry Thin-film transistor law 0103 physical sciences Solar cell Optoelectronics General Materials Science Crystalline silicon 0210 nano-technology business Ohmic contact |
| Zdroj: | ACS Applied Materials & Interfaces. 8:14671-14677 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | In this study, we present a novel application of thin magnesium fluoride films to form electron-selective contacts to n-type crystalline silicon (c-Si). This allows the demonstration of a 20.1%-efficient c-Si solar cell. The electron-selective contact is composed of deposited layers of amorphous silicon (∼6.5 nm), magnesium fluoride (∼1 nm), and aluminum (∼300 nm). X-ray photoelectron spectroscopy reveals a work function of 3.5 eV at the MgF2/Al interface, significantly lower than that of aluminum itself (∼4.2 eV), enabling an Ohmic contact between the aluminum electrode and n-type c-Si. The optimized contact structure exhibits a contact resistivity of ∼76 mΩ·cm(2), sufficiently low for a full-area contact to solar cells, together with a very low contact recombination current density of ∼10 fA/cm(2). We demonstrate that electrodes functionalized with thin magnesium fluoride films significantly improve the performance of silicon solar cells. The novel contacts can potentially be implemented also in organic optoelectronic devices, including photovoltaics, thin film transistors, or light emitting diodes. |
| Databáze: | OpenAIRE |
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