Structural and optical properties of Cs2AgBiBr6 double perovskite
We present a comprehensive study of the relationship between the crystal structure and optoelectronic properties of the double perovskite Cs2AgBiBr6, which has emerged as a promising candidate for photovoltaic devices. On the basis of single-crystal/powder X-ray diffraction and neutron powder diffra...
| Hlavní autoři: | , , , , , , , , , , |
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| Médium: | Journal article |
| Jazyk: | English |
| Vydáno: |
American Chemical Society
2018
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| _version_ | 1826273597645127680 |
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| author | Schade, L Wright, A Johnson, R Dollmann, M Wenger, B Nayak, P Prabhakaran, D Herz, L Nicholas, R Snaith, H Radaelli, P |
| author_facet | Schade, L Wright, A Johnson, R Dollmann, M Wenger, B Nayak, P Prabhakaran, D Herz, L Nicholas, R Snaith, H Radaelli, P |
| author_sort | Schade, L |
| collection | OXFORD |
| description | We present a comprehensive study of the relationship between the crystal structure and optoelectronic properties of the double perovskite Cs2AgBiBr6, which has emerged as a promising candidate for photovoltaic devices. On the basis of single-crystal/powder X-ray diffraction and neutron powder diffraction, we have revealed the presence of a structural phase transition at Ts ≈ 122 K between the room-temperature cubic structure (space group Fm3̅m) and a new low-temperature tetragonal structure (I4/m). From reflectivity measurements we found that the peak exciton energy Eex ≈ 2.85 eV near the direct gap shifts proportionally to the tetragonal strain, which is consistent with the Eex being primarily controlled by a rotational degree of freedom of the crystal structure, thus by the angle Bi−Ag−Br. We observed the time-resolved photoluminescence kinetics and we found that, among the relaxation channels, a fast one is mainly present in the tetragonal phase, suggesting that its origin may lie in the formation of tetragonal twin domains. |
| first_indexed | 2024-03-06T22:30:37Z |
| format | Journal article |
| id | oxford-uuid:5825d3be-7531-48bb-b7db-785d88417887 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:30:37Z |
| publishDate | 2018 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:5825d3be-7531-48bb-b7db-785d884178872022-03-26T17:01:24ZStructural and optical properties of Cs2AgBiBr6 double perovskiteJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5825d3be-7531-48bb-b7db-785d88417887EnglishSymplectic Elements at OxfordAmerican Chemical Society2018Schade, LWright, AJohnson, RDollmann, MWenger, BNayak, PPrabhakaran, DHerz, LNicholas, RSnaith, HRadaelli, PWe present a comprehensive study of the relationship between the crystal structure and optoelectronic properties of the double perovskite Cs2AgBiBr6, which has emerged as a promising candidate for photovoltaic devices. On the basis of single-crystal/powder X-ray diffraction and neutron powder diffraction, we have revealed the presence of a structural phase transition at Ts ≈ 122 K between the room-temperature cubic structure (space group Fm3̅m) and a new low-temperature tetragonal structure (I4/m). From reflectivity measurements we found that the peak exciton energy Eex ≈ 2.85 eV near the direct gap shifts proportionally to the tetragonal strain, which is consistent with the Eex being primarily controlled by a rotational degree of freedom of the crystal structure, thus by the angle Bi−Ag−Br. We observed the time-resolved photoluminescence kinetics and we found that, among the relaxation channels, a fast one is mainly present in the tetragonal phase, suggesting that its origin may lie in the formation of tetragonal twin domains. |
| spellingShingle | Schade, L Wright, A Johnson, R Dollmann, M Wenger, B Nayak, P Prabhakaran, D Herz, L Nicholas, R Snaith, H Radaelli, P Structural and optical properties of Cs2AgBiBr6 double perovskite |
| title | Structural and optical properties of Cs2AgBiBr6 double perovskite |
| title_full | Structural and optical properties of Cs2AgBiBr6 double perovskite |
| title_fullStr | Structural and optical properties of Cs2AgBiBr6 double perovskite |
| title_full_unstemmed | Structural and optical properties of Cs2AgBiBr6 double perovskite |
| title_short | Structural and optical properties of Cs2AgBiBr6 double perovskite |
| title_sort | structural and optical properties of cs2agbibr6 double perovskite |
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