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Perovskite-sensitized upconversion bingo: Stoichiometry, composition, solvent, or temperature?

Alexander S Bieber1, Zachary A VanOrman1, Sarah Wieghold1

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.

The Journal of Chemical Physics
|September 3, 2020
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Summary
This summary is machine-generated.

Photon upconversion (UC) devices using perovskite sensitizers are improved by optimizing fabrication. Thermal annealing significantly enhances UC performance by threefold, demonstrating a key advancement in device efficiency.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Device Engineering

Background:

  • Triplet-triplet annihilation-based photon upconversion (UC) with perovskite sensitizers enables efficient light harvesting at low fluences.
  • Previous UC device fabrication lacked optimization, limiting performance and scalability.

Purpose of the Study:

  • To enhance perovskite-sensitized UC device performance by adapting successful perovskite solar cell fabrication techniques.
  • To identify key fabrication parameters influencing UC efficiency.

Main Methods:

  • Investigated post-fabrication thermal annealing.
  • Compared stoichiometric vs. overstoichiometric PbI2 addition.
  • Examined methylammonium vs. formamidinium cation-rich perovskite compositions.
  • Assessed different solvents (toluene, chlorobenzene) for annihilator deposition.

Main Results:

  • Excess PbI2 showed minimal impact on the UC process.
  • Perovskite composition critically affects carrier extraction efficiency.
  • Solvent choice for annihilator deposition significantly influences device performance.
  • Thermal annealing improved UC performance by a factor of three.

Conclusions:

  • Optimizing fabrication, particularly thermal annealing and perovskite composition, is crucial for high-performance UC devices.
  • Solvent selection for the annihilator layer is a key factor in device efficiency.
  • These findings pave the way for more efficient perovskite-based photon upconversion technologies.