Flexophotovoltaic Effect and Above-Band-Gap Photovoltage Induced by Strain Gradients in Halide Perovskites
We have measured the flexophotovoltaic effect of single crystals of halide perovskites MAPbBr3 and MAPbI3, as well as the benchmark oxide perovskite SrTiO3. For halide perovskites, the flexophotovoltaic effect is found to be orders of magnitude larger than for SrTiO3, and indeed large enough to indu...
| Authors: | , , , , , , |
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| Format: | article |
| Publication Date: | 2024 |
| Country: | España |
| Institution: | Universitat Autònoma de Barcelona |
| Repository: | Dipòsit Digital de Documents de la UAB |
| Language: | English |
| OAI Identifier: | oai:ddd.uab.cat:307865 |
| Online Access: | https://ddd.uab.cat/record/307865 https://dx.doi.org/urn:doi:10.1103/PhysRevLett.132.086902 |
| Access Level: | Open access |
| Keyword: | Halide perovskites Orders of magnitude Oxide perovskite Photo-voltage Photovoltaic materials Photovoltaic response Photovoltaics Strain gradients Switchable |
| Summary: | We have measured the flexophotovoltaic effect of single crystals of halide perovskites MAPbBr3 and MAPbI3, as well as the benchmark oxide perovskite SrTiO3. For halide perovskites, the flexophotovoltaic effect is found to be orders of magnitude larger than for SrTiO3, and indeed large enough to induce photovoltages bigger than the band gap. Moreover, we find that in MAPbI3 the flexophotovoltaic effect is additional to a native bulk photovoltaic response that is switchable and ferroelectric-like. The results suggest that strain gradient engineering can be a powerful tool to modify the photovoltaic output even in already well-established photovoltaic materials. |
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