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Yang, Mingmin, Kim, Dong Jik and Alexe, M. (Marin) (2018) Flexo-photovoltaic effect. Science . eaan3256. doi:10.1126/science.aan3256 (In Press)
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Official URL: http://doi.org/10.1126/science.aan3256
Abstract
It is highly desirable to discover photovoltaic mechanisms that enable a higher efficiency of solar cells. Here, we report that the bulk photovoltaic effect, which is free from the thermodynamic Shockley-Queisser limit but usually manifested only in noncentrosymmetric (piezoelectric or ferroelectric) materials, can be realized in any semiconductor, including silicon, by mediation of flexoelectric effect. We introduce strain gradients using either an atomic force microscope or a micron-scale indentation system, creating giant photovoltaic currents from centrosymmetric single crystals of SrTiO3, TiO2, and Si. This strain-gradient-induced bulk photovoltaic effect, which we call the flexo-photovoltaic effect, functions in the absence of a p-n junction. This finding may extend present solar cell technologies by boosting the solar energy conversion efficiency from a wide pool of established semiconductors.
| Item Type: | Journal Article | |||||||||||||||||||||
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| Subjects: | Q Science > QC Physics | |||||||||||||||||||||
| Divisions: | Faculty of Science > Physics | |||||||||||||||||||||
| SWORD Depositor: | Library Publications Router | |||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Photovoltaic effect, Semiconductors -- Electric properties, Silicon solar cells, Solar cells -- Materials | |||||||||||||||||||||
| Journal or Publication Title: | Science | |||||||||||||||||||||
| Publisher: | American Association for the Advancement of Science (AAAS) | |||||||||||||||||||||
| ISSN: | 1095-9203 | |||||||||||||||||||||
| Official Date: | 19 April 2018 | |||||||||||||||||||||
| Dates: |
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| Date of first compliant deposit: | 27 April 2018 | |||||||||||||||||||||
| Article Number: | eaan3256 | |||||||||||||||||||||
| DOI: | 10.1126/science.aan3256 | |||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||
| Publication Status: | In Press | |||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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