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Cation effect on excitons in perovskite nanocrystals from single-dot photoluminescence of CH3NH3PbI3
KTH Royal Inst Technol, Dept Appl Phys, Electrum 229, S-16440 Kista, Sweden;Beijing Inst Technol, Sch Mat Sci & Engn, 5 South St Zhongguancun, Beijing 100081, Peoples R China;Peking Univ, Collaborat Innovat Ctr Quantum Matter, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. KTH Royal Inst Technol, Dept Appl Phys, Electrum 229, S-16440 Kista, Sweden.ORCID iD: 0000-0001-5304-913X
Beijing Inst Technol, Sch Mat Sci & Engn, 5 South St Zhongguancun, Beijing 100081, Peoples R China;Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China.
Beijing Inst Technol, Sch Mat Sci & Engn, 5 South St Zhongguancun, Beijing 100081, Peoples R China.
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 19, article id 195430Article in journal (Refereed) Published
Abstract [en]

The single-dot photoluminescence properties of similar to 7 nm perovskite MAPbI(3) (MA = CH3NH3+) nanocrystals (NCs) were investigated in the 5-295 K temperature range both in spectral and time domains. Repeatable single-dot measurements were facilitated by the use of a protective polymer, which stabilized the NCs. Temperature-induced phase transition and exciton-phonon interactions were revealed as well as the exciton fine structure. A pronounced spectral jump of the emission peak at 140-160 K, indicating a tetragonal-orthorhombic phase transition, was observed. In addition, the emission linewidth of similar to 0.6 meV was measured, which is the narrowest ever recorded for this perovskite material system. A similar to 4.0 meV phonon mode was identified for the NCs at 5 K, defining the linewidth thermal broadening. In general, the presence of MA(+) leads to broader spectra than for Cs+ or FA(+) containing perovskite NCs. It is attributed to higher polarity of this cation, thus it is more susceptible to spectral diffusion, which is clearly observed here. Photoluminescence decay measurements indicated that the recombination from the lowest energy state of the emission level manifold is partially forbidden. This is opposite to Cs+ cation NCs, highlighting the central role of the positive ion in the exchange interaction in perovskites. Finally, delayed luminescence was found to govern the recombination dynamics below room temperature, suggesting an involvement of trap sites for the orthorhombic phase. The reported photophysics of a quantum-confined exciton in this material, which is of interest for various light-converting applications, clarifies the role of the cation in perovskite nanocrystal optical properties.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 100, no 19, article id 195430
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Condensed Matter Physics Other Physics Topics Physical Chemistry Engineering and Technology
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URN: urn:nbn:se:uu:diva-400111DOI: 10.1103/PhysRevB.100.195430ISI: 000498851300012OAI: oai:DiVA.org:uu-400111DiVA, id: diva2:1380427
Funder
The Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Available from: 2019-12-18 Created: 2019-12-18 Last updated: 2020-01-08Bibliographically approved

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