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Research Highlight | Center for Nanoscale Materials

Lattice dynamics in photoexcited 2D perovskites

In a report published in Advanced Materials, researchers investigated 2D perovskites using ultrafast transient X-ray diffraction as a function of optical excitation fluence to discern structural dynamics.

Scientific Achievement

Directly measured picosecond thru microsecond lattice dynamics of 2-dimensional lead halide perovskite using transient X-ray diffraction following controlled-fluence pulsed laser excitation. Found atypical lattice response.

Significance and Impact

With high temporal and high Q-resolution, we observe anisotropic lattice evolution in multiple stages. These findings provide increased understanding of the interplay between structural and photophysical properties which is beneficial for use in optoelectronics.

Research Details

  • Samples were spun rapidly to prevent heating and damage.
  • Diffraction linewidths after excitation narrow, surprisingly, indicating increased crystal ordering upon electron-hole pair formation and thermal expansion.

Work was performed in part at the Center for Nanoscale Materials and the Advanced Photon Source, DOE Office of Science user facilities.

DOI: 10.1002/adma.202202709

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About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://​sci​ence​.osti​.gov/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​-​a​t​-​a​-​G​lance.

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