Dataset Information

Real-time observation of the buildup of polaron in α-FAPbI₃.

ABSTRACT: The formation of polaron, i.e., the strong coupling process between the carrier and lattice, is considered to play a crucial role in benefiting the photoelectric performance of hybrid organic-inorganic halide perovskites. However, direct observation of the dynamical formation of polarons occurring at time scales within hundreds of femtoseconds remains a technical challenge. Here, by terahertz emission spectroscopy, we demonstrate the real-time observation of polaron formation process in FAPbI₃ films. Two different polaron resonances interpreted with the anharmonic coupling emission model have been studied: P1 at ~1 THz relates to the inorganic sublattice vibration mode and the P2 at ~0.4 THz peak relates to the FA⁺ cation rotation mode. Moreover, P2 could be further strengthened than P1 by pumping the hot carriers to the higher sub-conduction band. Our observations could open a door for THz emission spectroscopy to be a powerful tool in studying polaron formation dynamics in perovskites.

SUBMITTER: Yue X

PROVIDER: S-EPMC9938110 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature

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Real-time observation of the buildup of polaron in α-FAPbI<sub>3</sub>.

Yue Xingyu X Wang Chunwei C Zhang Bo B Zhang Zeyu Z Xiong Zhuang Z Zu Xinzhi X Liu Zhengzheng Z Hu Zhiping Z Odunmbaku George Omololu GO Zheng Yujie Y Sun Kuan K Du Juan J

Nature communications 20230217 1

The formation of polaron, i.e., the strong coupling process between the carrier and lattice, is considered to play a crucial role in benefiting the photoelectric performance of hybrid organic-inorganic halide perovskites. However, direct observation of the dynamical formation of polarons occurring at time scales within hundreds of femtoseconds remains a technical challenge. Here, by terahertz emission spectroscopy, we demonstrate the real-time observation of polaron formation process in FAPbI<su ...[more]

PMID: 36801865

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Project description:The spontaneous crystal surface reconstruction of M-plane α-Al2O3 is employed for nanopatterning and nanofabrication in various fields of research including, among others, magnetism, superconductivity, and optoelectronics. In this reconstruction process the crystalline surface transforms from a planar morphology to one with a nanoscale ripple patterning. However, the high sample temperature required to induce surface reconstruction made in situ studies of the process seem unfeasible. The kinetics of ripple pattern formation therefore remained uncertain, and thus production of templates for nanofabrication could not advance beyond a trial-and-error stage. We present an approach combining in situ real-time grazing incidence small-angle X-ray scattering experiments (GISAXS) with model-based analysis and with ex situ atomic force microscopy (AFM) to observe this morphological transition in great detail. Our approach provides time-resolved information about all relevant morphological parameters required to trace the surface topography on the nanometer scale during reconstruction, i.e., the time dependence of the pattern wavelength, the ripple length, width, and height, and thus their facet angles. It offers a comprehensive picture of this process exemplified by a M-plane α-Al2O3 surface annealed at 1325 °C for 930 min. Fitting the model parameters to the experimental GISAXS data revealed a Johnson-Mehl-Avrami-Kolmogorov type of behavior for the pattern wavelength and a predominantly linear time dependence of the other parameters. In this case the reconstruction resulted in a crystalline surface fully patterned with asymmetric ripple-shaped nanostructures of 75 nm periodicity, 15 nm in height, and 630 nm in length. By elucidating the time dependence of these morphological parameters, this study shows a powerful way to significantly advance the predictability of annealing outcome and thus to efficiently customize nanopatterned α-Al2O3 templates for improved nanofabrication routines.

Dataset Information

Real-time observation of the buildup of polaron in α-FAPbI₃.

Publications

Real-time observation of the buildup of polaron in α-FAPbI<sub>3</sub>.

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Dataset Information

Real-time observation of the buildup of polaron in α-FAPbI3.

Publications

Real-time observation of the buildup of polaron in α-FAPbI<sub>3</sub>.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Real-time observation of the buildup of polaron in α-FAPbI₃.