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Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Development of Efficient OLEDs from Solution Deposition
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Solution-processed ultrasensitive polymer photodetectors with high external quantum efficiency and detectivity.

Xilan Liu1, Hangxing Wang, Tingbin Yang

  • 1Department of Polymer Engineering, College of Polymer Science and Polymer Engineering, The University of Akron , Akron, Ohio 44325, United States.

ACS Applied Materials & Interfaces
|June 16, 2012
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Summary

High-performance polymer photodetectors (PDs) achieve excellent efficiency and detectivity at room temperature. Combined annealing treatments make these polymer PDs competitive with inorganic alternatives.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Polymer Science

Background:

  • Polymer photodetectors (PDs) offer potential advantages over inorganic counterparts.
  • Achieving high performance in polymer PDs remains a key challenge for widespread adoption.

Purpose of the Study:

  • To demonstrate high-performance polymer photodetectors (PDs) at room temperature.
  • To compare the performance of polymer PDs with inorganic photodetectors.

Main Methods:

  • Fabrication of polymer photodetectors (PDs).
  • Treatment of the active layer using solvent vapor annealing.
  • Postproduction thermal annealing of the polymer PDs.

Main Results:

  • Demonstrated polymer photodetectors (PDs) with external quantum efficiency ~80%.
  • Achieved detectivity over 10(13) Jones and a linear dynamic range over 120 dB.
  • Obtained dark current in the range of a few nA/cm(2) at room temperature.

Conclusions:

  • Combined annealing treatments significantly enhance polymer photodetector performance.
  • The demonstrated polymer PDs exhibit performance comparable to or exceeding inorganic counterparts.
  • These findings pave the way for advanced polymer-based optoelectronic devices.