Surface reconstruction of tetragonal methylammonium lead triiodide
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2021
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| _version_ | 1866909221172281344 |
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| author | Seidu, Azimatu Dvorak, Marc Järvi, Jari Rinke, Patrick Li, Jingrui |
| author_facet | Seidu, Azimatu Dvorak, Marc Järvi, Jari Rinke, Patrick Li, Jingrui |
| contents | We present a detailed first-principles analysis of the (001) surface of methylammonium lead triiodide (MAPbI3). With density-functional theory we investigate the atomic and electronic structure of the tetragonal (I4cm) phase of MAPbI3. We analysed surfaces models with MAI- (MAI-T) and PbI2-terminations(PbI2-T). For both terminations, we studied the clean-surface and a series of surface reconstructions. We find that the clean MAI-T model is more stable than its PbI2-T counterpart. For the MAI termination,reconstructions with added or removed units of nonpolar MAI and PbI2 are most stable. The corresponding band structures reveal surface states originating from the conduction band. Despite the presence of such additional surface states, our stable reconstructed surface models do not introduce new states within the band gap. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2108_10523 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Surface reconstruction of tetragonal methylammonium lead triiodide Seidu, Azimatu Dvorak, Marc Järvi, Jari Rinke, Patrick Li, Jingrui Materials Science Applied Physics We present a detailed first-principles analysis of the (001) surface of methylammonium lead triiodide (MAPbI3). With density-functional theory we investigate the atomic and electronic structure of the tetragonal (I4cm) phase of MAPbI3. We analysed surfaces models with MAI- (MAI-T) and PbI2-terminations(PbI2-T). For both terminations, we studied the clean-surface and a series of surface reconstructions. We find that the clean MAI-T model is more stable than its PbI2-T counterpart. For the MAI termination,reconstructions with added or removed units of nonpolar MAI and PbI2 are most stable. The corresponding band structures reveal surface states originating from the conduction band. Despite the presence of such additional surface states, our stable reconstructed surface models do not introduce new states within the band gap. |
| title | Surface reconstruction of tetragonal methylammonium lead triiodide |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2108.10523 |