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Single Particle Cryo-Electron Microscopy: From Sample to Structure
Published on: May 29, 2021
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Electronic properties and structure of single crystal perylene
S J Pookpanratana1, K P Goetz2,3, E G Bittle1
1Engineering Physics Division, National Institute of Standards and Technology (NIST), USA.
Organic Electronics
|April 16, 2019
Summary
Single crystal organic semiconductors like alpha-perylene exhibit superior electronic properties. This study reveals their intrinsic electronic structure and charge transport characteristics, crucial for advanced electronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Organic Electronics
Background:
- Single crystalline molecular semiconductors generally show enhanced transport properties compared to thin-film counterparts.
- Understanding the intrinsic electronic structure is key to explaining the superior performance of extrinsic device properties.
Purpose of the Study:
- To investigate the electronic structure and properties of single crystal alpha-phase perylene (C20H12).
- To correlate intrinsic electronic properties with charge transport behavior in organic semiconductors.
Main Methods:
- Angle-resolved ultraviolet photoemission spectroscopy (ARUPS).
- X-ray photoelectron spectroscopy (XPS), including high-resolution XPS.
- Field-effect transistor (FET) measurements.
Main Results:
- Determined key electronic structure aspects: highest occupied molecular orbital (HOMO) energy, HOMO bandwidth, and surface work function.
- High-resolution XPS distinguished inequivalent carbon atoms and revealed intramolecular properties via shake-up satellite structure.
- Charge carrier mobility in alpha-perylene was found to be approximately 10^-3 cm^2 V^-1 s^-1, dependent on device structure and dielectric.
Conclusions:
- The intrinsic electronic structure of single crystal alpha-perylene is well-defined and critical for its charge transport capabilities.
- XPS provides detailed insights into molecular properties and atomic-level electronic structure.
- Device performance metrics like mobility are influenced by extrinsic factors, highlighting the interplay between intrinsic properties and device engineering.
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