Microscopic morphology independence in linear absorption cross-section of CsPbBr3 nanocrystalsMicroscopic morphology independence in linear absorption cross-section of CsPbBr3 nanocrystals
(2021) In SCIENCE CHINA Materials 64(6). p.1418-1426- Abstract
Multiple morphologies of colloidal perovskite nanocrystals (NCs) diversify their optical and electronic properties. Among them, the linear absorption cross-section (σ) is a primary parameter to determine their intrinsic photophysical features, and consequently, application potential. Herein, three morphologies of all-inorganic hybrid colloidal perovskite CsPbBr3 NCs, nanocubes (NBs), nanoplatelets (NLs), and nanowires (NWs), were targeted, and their linear σ values were obtained through femtosecond transient absorption (TA) spectroscopy analysis. At high excitation energy well above the bandgap, the σ per particle of all CsPbBr3 NCs linearly increased with the particle volume (VNC) regardless of the... (More)
Multiple morphologies of colloidal perovskite nanocrystals (NCs) diversify their optical and electronic properties. Among them, the linear absorption cross-section (σ) is a primary parameter to determine their intrinsic photophysical features, and consequently, application potential. Herein, three morphologies of all-inorganic hybrid colloidal perovskite CsPbBr3 NCs, nanocubes (NBs), nanoplatelets (NLs), and nanowires (NWs), were targeted, and their linear σ values were obtained through femtosecond transient absorption (TA) spectroscopy analysis. At high excitation energy well above the bandgap, the σ per particle of all CsPbBr3 NCs linearly increased with the particle volume (VNC) regardless of the morphology with the value of σ400 = 9.45 × 104 cm−1 × VNC (cm2). Density functional theory (DFT) calculation confirmed the negligible influence of shapes on the optical selection rules. The Einstein spontaneous emission coefficients calculated from the σ values define the intrinsic radiative recombination rate. However, reduced size dependence is observed when the excitation energy is close to the bandgap (i.e., at 460 nm) with the value of σ460 = 2.82 × 108 cm0.65 × (VNC)0.45 (cm2). This should be ascribed to the discrete energy levels as well as lower density of states close to the band edge for perovskite NCs. These results provide in-depth insight into the optical characteristics for perovskite NCs.
(Less)
- author
- Zhang, Fengying LU ; Liu, Yuchen LU ; Wei, Shiqian ; Chen, Junsheng LU ; Zhou, Ying ; He, Rongxing ; Pullerits, Tõnu LU and Zheng, Kaibo LU
- organization
- publishing date
- 2021-06-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- absorption cross-section, density functional theory, multiple morphologies, radiative recombination, transient absorption spectroscopy
- in
- SCIENCE CHINA Materials
- volume
- 64
- issue
- 6
- pages
- 9 pages
- publisher
- Science in China Press
- external identifiers
-
- scopus:85100199299
- ISSN
- 2095-8226
- DOI
- 10.1007/s40843-020-1555-1
- language
- English
- LU publication?
- yes
- id
- 10153387-0b11-48ca-9bcc-81496e815308
- date added to LUP
- 2021-02-12 13:11:09
- date last changed
- 2023-11-20 22:55:57
@article{10153387-0b11-48ca-9bcc-81496e815308, abstract = {{<p>Multiple morphologies of colloidal perovskite nanocrystals (NCs) diversify their optical and electronic properties. Among them, the linear absorption cross-section (σ) is a primary parameter to determine their intrinsic photophysical features, and consequently, application potential. Herein, three morphologies of all-inorganic hybrid colloidal perovskite CsPbBr<sub>3</sub> NCs, nanocubes (NBs), nanoplatelets (NLs), and nanowires (NWs), were targeted, and their linear σ values were obtained through femtosecond transient absorption (TA) spectroscopy analysis. At high excitation energy well above the bandgap, the σ per particle of all CsPbBr<sub>3</sub> NCs linearly increased with the particle volume (V<sub>NC</sub>) regardless of the morphology with the value of σ<sub>400</sub> = 9.45 × 10<sup>4</sup> cm<sup>−1</sup> × V<sub>NC</sub> (cm<sup>2</sup>). Density functional theory (DFT) calculation confirmed the negligible influence of shapes on the optical selection rules. The Einstein spontaneous emission coefficients calculated from the σ values define the intrinsic radiative recombination rate. However, reduced size dependence is observed when the excitation energy is close to the bandgap (i.e., at 460 nm) with the value of σ<sub>460</sub> = 2.82 × 10<sup>8</sup> cm<sup>0.65</sup> × (V<sub>NC</sub>)<sup>0.45</sup> (cm<sup>2</sup>). This should be ascribed to the discrete energy levels as well as lower density of states close to the band edge for perovskite NCs. These results provide in-depth insight into the optical characteristics for perovskite NCs.</p>}}, author = {{Zhang, Fengying and Liu, Yuchen and Wei, Shiqian and Chen, Junsheng and Zhou, Ying and He, Rongxing and Pullerits, Tõnu and Zheng, Kaibo}}, issn = {{2095-8226}}, keywords = {{absorption cross-section; density functional theory; multiple morphologies; radiative recombination; transient absorption spectroscopy}}, language = {{eng}}, month = {{06}}, number = {{6}}, pages = {{1418--1426}}, publisher = {{Science in China Press}}, series = {{SCIENCE CHINA Materials}}, title = {{Microscopic morphology independence in linear absorption cross-section of CsPbBr<sub>3</sub> nanocrystalsMicroscopic morphology independence in linear absorption cross-section of CsPbBr<sub>3</sub> nanocrystals}}, url = {{http://dx.doi.org/10.1007/s40843-020-1555-1}}, doi = {{10.1007/s40843-020-1555-1}}, volume = {{64}}, year = {{2021}}, }