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Cool carriers: triplet diffusion dominates upconversion yield.

Colette M Sullivan1, Jason E Kuszynski1, Alexey Kovalev2

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|November 15, 2023
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Summary
This summary is machine-generated.

Temperature affects triplet-triplet annihilation upconversion (TTA-UC) efficiency in perovskite/rubrene devices. Maximum efficiency occurs at 170 K, limited by triplet diffusion, not perovskite properties.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Optoelectronics

Background:

  • Perovskites are popular in photovoltaics and as triplet sensitizers for triplet-triplet annihilation upconversion (TTA-UC).
  • Understanding environmental influences on device performance is crucial for perovskite commercialization.
  • Methylammonium formamidinium lead triiodide (MAFA) and rubrene are key materials in TTA-UC devices.

Purpose of the Study:

  • To explore the temperature-dependent structure-function properties of TTA-UC in MAFA/rubrene devices.
  • To investigate how temperature influences the dynamics of TTA-UC.
  • To determine the limiting factors of TTA-UC efficiency in these devices.

Main Methods:

  • Spectroscopic methods
  • Structural methods
  • Theoretical modeling
  • Device characterization at varying temperatures

Main Results:

  • A strong temperature dependence of TTA-UC dynamics was observed.
  • Maximum UC efficiency was achieved at 170 K.
  • TTA-UC efficiency is limited by triplet diffusion, not perovskite carrier lifetime or sensitizer properties at low temperatures.

Conclusions:

  • Triplet diffusion is the primary factor limiting TTA-UC efficiency in MAFA/rubrene devices.
  • Perovskite carrier lifetime does not solely govern TTA-UC performance.
  • Optimizing triplet diffusion is key for enhancing TTA-UC in perovskite-based systems.