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Ionic Crystal Structures02:42

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Static Disorder in Lead Halide Perovskites.

Stefan Zeiske1, Oskar J Sandberg1, Nasim Zarrabi1

  • 1Sustainable Advanced Materials (Sêr-SAM), Department of Physics, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom.

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We measured the Urbach energy in lead halide perovskites, revealing insights into energetic disorder. Our findings suggest zero-point phonon energy dominates static disorder at low temperatures, expanding perovskite applications.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Optoelectronics

Background:

  • The Urbach energy quantifies energetic disorder in semiconductors, crucial for device performance.
  • Understanding temperature-dependent Urbach energy is key to characterizing material stability and charge carrier dynamics.
  • Lead halide perovskites are promising optoelectronic materials, but their disorder properties require further investigation.

Purpose of the Study:

  • To investigate the temperature-dependent Urbach energy in single, double, and triple cation lead halide perovskites.
  • To differentiate between static and dynamic contributions to the Urbach energy.
  • To explore the origins of static disorder in perovskites and its implications for applications.

Main Methods:

  • Utilized advanced photocurrent spectroscopy to measure absorption spectra.
  • Analyzed the inverse slope of the logarithm of the absorption spectrum to determine Urbach energy.
  • Investigated temperature-dependent behavior to separate static and dynamic disorder components.

Main Results:

  • Room temperature Urbach energies were determined as 13.0 ± 1.0 meV (single), 13.2 ± 1.0 meV (double), and 13.5 ± 1.0 meV (triple cation).
  • Static, temperature-independent disorder contributions were found to be low: 5.1 ± 0.5 meV (single), 4.7 ± 0.3 meV (double), and 3.3 ± 0.9 meV (triple cation).
  • Dominant static disorder at low temperatures originates from zero-point phonon energy, not structural disorder.

Conclusions:

  • Perovskites exhibit unusually low static disorder, primarily driven by zero-point phonon energy at low temperatures.
  • This finding differentiates perovskites from other solution-processed semiconductors.
  • The reduced disorder broadens the potential applications of perovskites in quantum electronics and advanced devices.