Droseros, Nikolaos; Longo, Giulia; Brauer, Jan C.; Sessolo, Michele; Bolink, Henk J.; Banerji, Natalie (2018). Origin of the Enhanced Photoluminescence Quantum Yield in MAPbBr 3 Perovskite with Reduced Crystal Size. ACS energy letters, 3(6), pp. 1458-1466. American Chemical Society 10.1021/acsenergylett.8b00475
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Methylammonium lead bromide perovskite (MAPbBr3) has been widely investigated for applications in visible perovskite light-emitting diodes (LEDs). Fine-tuning of the morphology and of the crystal size, from the microscale down to the quantum confinement regime, has been used to increase the photoluminescence quantum yield (PLQY). However, the physical processes underlying the PL emission of this perovskite remain unclear. Here, we elucidate the origin of the PL emission of polycrystalline MAPbBr3 thin films by different spectroscopic techniques. We estimate the exciton binding energy, the reduced exciton effective mass, and the trap density. Moreover, we confirm the coexistence of free carriers and excitons, quantifying their relative population and mutual interaction over a broad range of excitation densities. Finally, the enhanced PLQY upon crystal size reduction to the micro- and nanometer scale in the presence of additives is attributed to favored excitonic recombination together with reduced surface trapping thanks to efficient passivation by the additives.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Droseros, Nikolaos, Banerji, Natalie |
Subjects: |
500 Science > 530 Physics 500 Science > 540 Chemistry |
ISSN: |
2380-8195 |
Publisher: |
American Chemical Society |
Language: |
English |
Submitter: |
Gareth John Moore |
Date Deposited: |
07 Dec 2018 13:01 |
Last Modified: |
05 Dec 2022 15:20 |
Publisher DOI: |
10.1021/acsenergylett.8b00475 |
Additional Information: |
["European Union (EU)" and "Horizon 2020"]["Euratom" and "Euratom research and training programme 2014-2018"] |
BORIS DOI: |
10.7892/boris.121527 |
URI: |
https://boris.unibe.ch/id/eprint/121527 |
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