| Autor: |
Ni, Chengsheng, Hedley, Gordon James, Payne, Julia Louise, Svrcek, Vladimir, McDonald, Calum, Krishnan Jagadamma, Lethy, Edwards, Paul, Martin, Robert, Jain, Gunisha, Carolan, Darragh, Mariotti, Davide, Maguire, Paul, Samuel, Ifor David William, Irvine, John Thomas Sirr |
| Přispěvatelé: |
EPSRC, University of St Andrews. School of Chemistry, University of St Andrews. School of Physics and Astronomy, University of St Andrews. Condensed Matter Physics, University of St Andrews. EaSTCHEM |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
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| Popis: |
A metal-organic hybrid perovskite (CH3NH3PbI3) with three-dimensional framework of metal-halide octahedra has been reported as a low-cost, solution-processable absorber for a thin-film solar cell with a power-conversion efficiency over 20%. Low-dimensional layered perovskites with metal halide slabs separated by the insulating organic layers are reported to show higher stability, but the efficiencies of the solar cells are limited by the confinement of excitons. In order to explore the confinement and transport of excitons in zero-dimensional metal–organic hybrid materials, a highly orientated film of (CH3NH3)3Bi2I9 with nanometre-sized core clusters of Bi2I93− surrounded by insulating CH3NH3+ was prepared via solution processing. The (CH3NH3)3Bi2I9 film shows highly anisotropic photoluminescence emission and excitation due to the large proportion of localised excitons coupled with delocalised excitons from intercluster energy transfer. The abrupt increase in photoluminescence quantum yield at excitation energy above twice band gap could indicate a quantum cutting due to the low dimensionality. Publisher PDF |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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