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Flash Infrared Annealing for Perovskite Solar Cell Processing
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Thermal Management Enables Bright and Stable Perovskite Light-Emitting Diodes.

Lianfeng Zhao1, Kwangdong Roh1, Sara Kacmoli1

  • 1Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA.

Advanced Materials (Deerfield Beach, Fla.)
|May 15, 2020
PubMed
Summary

Thermal management is key for high-performance lead-halide perovskite light-emitting diodes (LEDs). This study demonstrates strategies to overcome Joule heating, significantly boosting radiance, efficiency, and operational lifetime for advanced optoelectronic applications.

Keywords:
device stabilityefficiency roll-offorganic-inorganic hybrid perovskitesperovskite light-emitting devicesthermal management

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Semiconductor Devices

Background:

  • Lead-halide perovskite light-emitting diodes (LEDs) show rapid performance improvements.
  • Current limitations include low current densities and moderate radiance due to Joule heating and poor thermal dissipation.
  • High radiance and long operational lifetime are critical for practical applications.

Purpose of the Study:

  • To investigate the impact of Joule heating and thermal dissipation on perovskite LED performance.
  • To propose and evaluate thermal management strategies for enhancing device performance.
  • To demonstrate high-radiance and long-lifetime perovskite LEDs.

Main Methods:

  • Implementing thermal management strategies: doping charge-transport layers, optimizing device geometry, and attaching heat spreaders/sinks.
  • Characterizing device performance under various current densities and operational conditions.
  • Utilizing electrical pulsing to achieve ultra-high current densities.

Main Results:

  • Achieved maximum radiance of 2555 W sr-1 m-2 and peak external quantum efficiency (EQE) of 17%.
  • Significantly reduced EQE roll-off, maintaining EQE > 10% up to 2000 mA cm-2.
  • Demonstrated a tenfold increase in operational lifetime at 100 mA cm-2.
  • Showcased ultra-high current densities of 2.5 kA cm-2 with ≈1% EQE at 1 kA cm-2 using electrical pulses.

Conclusions:

  • Joule heating and inefficient thermal dissipation are major barriers to high-performance perovskite LEDs.
  • Effective thermal management strategies are crucial for achieving high radiance and extended operational lifetimes.
  • The demonstrated performance advancements represent a significant step towards electrically driven perovskite lasers.