Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Cation effect on excitons in perovskite nanocrystals from single-dot photoluminescence of CH3NH3PbI3
KTH, School of Engineering Sciences (SCI), Applied Physics. 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..
KTH, School of Engineering Sciences (SCI), Applied Physics. Uppsala Univ, Dept Engn Sci, Solid State Elect, Angstromlab, Lagerhyddsvagen 1, S-75121 Uppsala, 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..
Show others and affiliations
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
Keywords [en]
Temperature-Dependent Photoluminescence, Inorganic Perovskite, Optical-Properties, Charged Excitons, Photon Emission, Quantum Dots, Lead, Cspbbr3, Blinking, Recombination
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-265470DOI: 10.1103/PhysRevB.100.195430ISI: 000498851300012Scopus ID: 2-s2.0-85075801940OAI: oai:DiVA.org:kth-265470DiVA, id: diva2:1377981
Note

QC 20191213

Available from: 2019-12-13 Created: 2019-12-13 Last updated: 2019-12-19Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Liu, LigePevere, FedericoSychugov, Ilya

Search in DiVA

By author/editor
Liu, LigePevere, FedericoSychugov, Ilya
By organisation
Applied Physics
In the same journal
Physical Review B
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 7 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf