Visualizing Light-Induced Microstrain and Phase Transition in Lead-Free Perovskites Using Time-Resolved X-Ray Diffraction

Wang, YingqiCenter for High Pressure Science &Technology Advanced Research (HPSTAR) (författare)

Metal halide perovskites have emerged as promising materials for optoelectronic applications in the last decade. A large amount of effort has been made to investigate the interplay between the crystalline lattice and photoexcited charge carriers as it is vital to their optoelectronic performance. Among them, ultrafast laser spectroscopy has been intensively utilized to explore the charge carrier dynamics of perovskites, from which the local structural information can only be extracted indirectly. Here, we have applied a time-resolved X-ray diffraction technique to investigate the structural dynamics of prototypical two-dimensional lead-free halide perovskite Cs3Bi2Br9nanoparticles across temporal scales from 80 ps to microseconds. We observed a quick recoverable (a few ns) photoinduced microstrain up to 0.15% and a long existing lattice expansion (∼a few hundred nanoseconds) at mild laser fluence. Once the laser flux exceeds 1.4 mJ/cm2, the microstrain saturates and the crystalline phase partially transfers into a disordered phase. This photoinduced transient structural change can recover within the nanosecond time scale. These results indicate that photoexcitation of charge carriers couples with lattice distortion, which fundamentally affects the dielectric environment and charge carrier transport.

Liu, CunmingArgonne National Laboratory (författare)
Ren, YangCity University of Hong Kong (författare)
Zuo, XiaobingArgonne National Laboratory (författare)
Canton, Sophie E.European XFEL GmbH(Swepub:lu)chem-sca (författare)
Zheng, KaiboLund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)chem-kbz (författare)
Lu, KuangdaPeking University (författare)
Lü, XujieCenter for High Pressure Science &Technology Advanced Research (HPSTAR) (författare)
Yang, WengeCenter for High Pressure Science &Technology Advanced Research (HPSTAR) (författare)
Zhang, XiaoyiArgonne National Laboratory (författare)
Center for High Pressure Science &Technology Advanced Research (HPSTAR)Argonne National Laboratory (creator_code:org_t)

Ingår i:Journal of the American Chemical Society: American Chemical Society (ACS)144:12, s. 5335-53410002-78631520-5126

Av författaren/redakt...: Wang, Yingqi; Liu, Cunming; Ren, Yang; Zuo, Xiaobing; Canton, Sophie E ...; Zheng, Kaibo; visa fler...; Lu, Kuangda; Lü, Xujie; Yang, Wenge; Zhang, Xiaoyi; visa färre...

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