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We present the synthesis of Er-doped NaYF4/NaLuF4 core/shell nanocrystal films, which enable optical upconversion of photons from a wavelength of 1500 nm into photons of a wavelength of 980 nm. Combining such films with specially tailored Au nanostructures and a Au back-reflector, it is demonstrated that the upconversion luminescence yield can be enhanced up to 31 ± 3 times and that the performance of the upconverting layer can be modeled well for a broad range of excitation conditions. In particular, the analysis shows that the performance of the Au structures corresponds to a solar concentration factor of 4.1 ± 0.6. The relevance of the results for improving the performance of crystalline silicon solar cells is discussed.
Original language | English |
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Journal | The Journal of Physical Chemistry Part C |
Volume | 124 |
Issue | 41 |
Pages (from-to) | 22357–22365 |
Number of pages | 9 |
ISSN | 1932-7447 |
DOIs | |
Publication status | Published - Oct 2020 |
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ID: 199491608