Intrinsic quantum confinement in formamidiniumlead triiodide perovskite
Understanding the electronic energy landscape in metal halide perovskites is essential for further improvements in their promising performance in thin-film photovoltaics. Here, we uncover the presence of above-bandgap oscillatory features in the absorption spectra of formamidinium lead triiodide thi...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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Nature Research
2020
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| _version_ | 1797054634934665216 |
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| author | Wright, AD Volonakis, G Borchert, J Johnston, M Herz, L |
| author_facet | Wright, AD Volonakis, G Borchert, J Johnston, M Herz, L |
| author_sort | Wright, AD |
| collection | OXFORD |
| description | Understanding the electronic energy landscape in metal halide perovskites is essential for further improvements in their promising performance in thin-film photovoltaics. Here, we uncover the presence of above-bandgap oscillatory features in the absorption spectra of formamidinium lead triiodide thin films. We attribute these discrete features to intrinsically occurring quantum confinement effects, for which the related energies change with temperature according to the inverse square of the intrinsic lattice parameter, and with peak index in a quadratic manner. By determining the threshold film thickness at which the amplitude of the peaks is appreciably decreased, and through ab initio simulations of the absorption features, we estimate the length scale of confinement to be 10–20 nm. Such absorption peaks present a new and intriguing quantum electronic phenomenon in a nominally bulk semiconductor, offering intrinsic nanoscale optoelectronic properties without necessitating cumbersome additional processing steps.
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| first_indexed | 2024-03-06T18:59:59Z |
| format | Journal article |
| id | oxford-uuid:1332bf38-0548-4096-b77f-15fbc9371446 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:59:59Z |
| publishDate | 2020 |
| publisher | Nature Research |
| record_format | dspace |
| spelling | oxford-uuid:1332bf38-0548-4096-b77f-15fbc93714462022-03-26T10:12:27ZIntrinsic quantum confinement in formamidiniumlead triiodide perovskiteJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1332bf38-0548-4096-b77f-15fbc9371446EnglishSymplectic ElementsNature Research2020Wright, ADVolonakis, GBorchert, JJohnston, MHerz, LUnderstanding the electronic energy landscape in metal halide perovskites is essential for further improvements in their promising performance in thin-film photovoltaics. Here, we uncover the presence of above-bandgap oscillatory features in the absorption spectra of formamidinium lead triiodide thin films. We attribute these discrete features to intrinsically occurring quantum confinement effects, for which the related energies change with temperature according to the inverse square of the intrinsic lattice parameter, and with peak index in a quadratic manner. By determining the threshold film thickness at which the amplitude of the peaks is appreciably decreased, and through ab initio simulations of the absorption features, we estimate the length scale of confinement to be 10–20 nm. Such absorption peaks present a new and intriguing quantum electronic phenomenon in a nominally bulk semiconductor, offering intrinsic nanoscale optoelectronic properties without necessitating cumbersome additional processing steps. |
| spellingShingle | Wright, AD Volonakis, G Borchert, J Johnston, M Herz, L Intrinsic quantum confinement in formamidiniumlead triiodide perovskite |
| title | Intrinsic quantum confinement in formamidiniumlead triiodide perovskite |
| title_full | Intrinsic quantum confinement in formamidiniumlead triiodide perovskite |
| title_fullStr | Intrinsic quantum confinement in formamidiniumlead triiodide perovskite |
| title_full_unstemmed | Intrinsic quantum confinement in formamidiniumlead triiodide perovskite |
| title_short | Intrinsic quantum confinement in formamidiniumlead triiodide perovskite |
| title_sort | intrinsic quantum confinement in formamidiniumlead triiodide perovskite |
| work_keys_str_mv | AT wrightad intrinsicquantumconfinementinformamidiniumleadtriiodideperovskite AT volonakisg intrinsicquantumconfinementinformamidiniumleadtriiodideperovskite AT borchertj intrinsicquantumconfinementinformamidiniumleadtriiodideperovskite AT johnstonm intrinsicquantumconfinementinformamidiniumleadtriiodideperovskite AT herzl intrinsicquantumconfinementinformamidiniumleadtriiodideperovskite |