Journal article 221 views
Shape- and excitation-dependent charge-carrier dynamics in colloidal MAPbI perovskites as nanostripes, nanosheets and nanoplatelets
,
Rostyslav Lesyuk,
Christian Klinke
Journal of Materials Chemistry C, Volume: 11, Issue: 28, Pages: 9495 - 9503
Swansea University Author:
Christian Klinke
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DOI (Published version): 10.1039/d3tc00463e
Abstract
Nanostructured lead halide perovskites are an attractive group of materials for highly efficient optoelectronic applications. Considering the wide variety in shape, size and crystal structures (layered, non-layered, hollow, double), many different excited-state population and relaxation processes ca...
| Published in: | Journal of Materials Chemistry C |
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| ISSN: | 2050-7526 2050-7534 |
| Published: |
Royal Society of Chemistry (RSC)
2023
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa63776 |
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| Abstract: |
Nanostructured lead halide perovskites are an attractive group of materials for highly efficient optoelectronic applications. Considering the wide variety in shape, size and crystal structures (layered, non-layered, hollow, double), many different excited-state population and relaxation processes can be present, such as exciton formation, free charge carrier generation, exciton–exciton annihilation, and Auger recombination. Here, we present the synthesis of nanostructures with different morphology to improve the optical properties of methylammonium lead iodide and to investigate the corresponding charge-carrier dynamics and recombination processes. Excitation intensity dependent time-resolved photoluminescence (PL) measurements are performed to highlight the PL decay behaviour of nanosheets, nanoplatelets, and nanostripes. In all three cases a faster decay rate is observed with increasing excitation fluence. This behaviour can be attributed to the occurrence of bimolecular recombination of electrons and holes in nanosheets and exciton–exciton annihilation in nanostripes with high carrier densities. Performing these measurements at low excitation intensities revealed unusual long charge-carrier lifetimes of a few microseconds. Additionally, the nanostripes showed the best results in terms of photoluminescence quantum yield of up to 75% and the nanosheets demonstrate improved stability. The nanoplatelets are considered as intermediate structures between nanosheets and nanostripes – balancing quantum yield and stability. |
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| Keywords: |
Colloidal synthesis, methylammonium lead iodide, nanostructures, spectroscopy, exciton-exciton annihilation |
| College: |
Faculty of Science and Engineering |
| Funders: |
The authors thank the Sylvia Speller group and Regina Lange for providing the AFM setup. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) is acknowledged for funding of SFB 1477 "Light-Matter Interactions at Interfaces", project number 441234705. We also acknowledge the European Regional Development Fund of the European Union for funding the PL spectrometer (GHS20-0035/P000376218) and X-ray diffractometer (GHS-20-0036/P000379642) and the Deutsche Forschungsgemeinschaft (DFG) for funding an electron microscope Jeol NeoARM TEM (INST 264/161-1 FUGG) and an electron microscope ThermoFisher Talos L120C (INST 264/188-1 FUGG). |
| Issue: |
28 |
| Start Page: |
9495 |
| End Page: |
9503 |