Abstract
The absorption and photoluminescence, both steady-state and time-resolved, of CsPbX3 (X = Cl, Br, I) nanocrystals are reported at temperatures ranging from 3 to 300 K. These measurements offer a unique window into the fundamental properties of this class of materials which is considered promising for light-emitting and detection devices. The bandgaps are shown to increase from low to high temperature, and none of the examined cesium-based perovskite nanocrystals exhibit a bandgap discontinuity in this temperature range suggesting constant crystal phase. Time-resolved measurements show that the radiative lifetime of the band-edge emission depends strongly on the halide ion and increases with heating. The increasing lifetime at higher temperatures is attributed primarily to free carriers produced from exciton fission, corroborated by the prevalence of excitonic character in absorption. The results particularly highlight many of the similarities in physical properties, such as low exciton binding energy and long lifetime, between CsPbI3 and hybrid organic-inorganic plumbotrihalide perovskites.
| Original language | English |
|---|---|
| Journal | Advanced Functional Materials |
| DOIs | |
| Publication status | Accepted/In press - Jan 1 2018 |
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Keywords
- Absorption
- Excitons
- Lifetime
- Perovskites
- Photoluminescence
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Condensed Matter Physics
- Electrochemistry
Cite this
Low-Temperature Absorption, Photoluminescence, and Lifetime of CsPbX3 (X = Cl, Br, I) Nanocrystals. / Diroll, Benjamin T.; Zhou, Hua; Schaller, Richard D.
In: Advanced Functional Materials, 01.01.2018.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Low-Temperature Absorption, Photoluminescence, and Lifetime of CsPbX3 (X = Cl, Br, I) Nanocrystals
AU - Diroll, Benjamin T.
AU - Zhou, Hua
AU - Schaller, Richard D
PY - 2018/1/1
Y1 - 2018/1/1
N2 - The absorption and photoluminescence, both steady-state and time-resolved, of CsPbX3 (X = Cl, Br, I) nanocrystals are reported at temperatures ranging from 3 to 300 K. These measurements offer a unique window into the fundamental properties of this class of materials which is considered promising for light-emitting and detection devices. The bandgaps are shown to increase from low to high temperature, and none of the examined cesium-based perovskite nanocrystals exhibit a bandgap discontinuity in this temperature range suggesting constant crystal phase. Time-resolved measurements show that the radiative lifetime of the band-edge emission depends strongly on the halide ion and increases with heating. The increasing lifetime at higher temperatures is attributed primarily to free carriers produced from exciton fission, corroborated by the prevalence of excitonic character in absorption. The results particularly highlight many of the similarities in physical properties, such as low exciton binding energy and long lifetime, between CsPbI3 and hybrid organic-inorganic plumbotrihalide perovskites.
AB - The absorption and photoluminescence, both steady-state and time-resolved, of CsPbX3 (X = Cl, Br, I) nanocrystals are reported at temperatures ranging from 3 to 300 K. These measurements offer a unique window into the fundamental properties of this class of materials which is considered promising for light-emitting and detection devices. The bandgaps are shown to increase from low to high temperature, and none of the examined cesium-based perovskite nanocrystals exhibit a bandgap discontinuity in this temperature range suggesting constant crystal phase. Time-resolved measurements show that the radiative lifetime of the band-edge emission depends strongly on the halide ion and increases with heating. The increasing lifetime at higher temperatures is attributed primarily to free carriers produced from exciton fission, corroborated by the prevalence of excitonic character in absorption. The results particularly highlight many of the similarities in physical properties, such as low exciton binding energy and long lifetime, between CsPbI3 and hybrid organic-inorganic plumbotrihalide perovskites.
KW - Absorption
KW - Excitons
KW - Lifetime
KW - Perovskites
KW - Photoluminescence
UR - http://www.scopus.com/inward/record.url?scp=85047624171&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85047624171&partnerID=8YFLogxK
U2 - 10.1002/adfm.201800945
DO - 10.1002/adfm.201800945
M3 - Article
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
ER -