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Flash Infrared Annealing for Perovskite Solar Cell Processing
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Temperature Impact on Perovskite Solar Cells Under Operation.

Isabel Mesquita1, Luísa Andrade1, Adélio Mendes1

  • 1LEPABE-Chemical Engineering Department, University of Porto, Faculty of Engineering, Rua Dr. Roberto Frias s/n, 4200-465, Porto, Portugal.

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|February 26, 2019
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Summary
This summary is machine-generated.

Perovskite solar cells (PSCs) show promise but struggle with thermal stability. This study reveals that elevated temperatures degrade hole extraction layers, impacting performance, with PTAA showing better long-term stability than spiro-OMeTAD.

Keywords:
energy conversionperovskitesphotovoltaicssolar cellstemperature effects

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Area of Science:

  • Photovoltaics
  • Materials Science
  • Renewable Energy

Background:

  • Perovskite solar cells (PSCs) offer rapid efficiency gains, surpassing conventional silicon panels.
  • Thermal stability remains a critical barrier to the commercialization of PSCs.
  • Triple-cation PSCs with spiro-OMeTAD and PTAA hole extraction layers were investigated.

Purpose of the Study:

  • To assess the impact of temperature on the photovoltaic performance of mesoporous triple-cation PSCs.
  • To identify the mechanisms behind performance degradation under thermal stress.
  • To compare the thermal stability of spiro-OMeTAD and PTAA as hole extraction materials.

Main Methods:

  • In situ monitoring of photovoltaic performance under thermal stress (-5°C to 80°C).
  • Analysis of perovskite crystal structure using X-ray diffraction.
  • Investigation of hole extraction layer changes using electron scanning microscopy and X-ray photoelectron spectroscopy.

Main Results:

  • Low temperatures (-5°C) showed minimal performance loss (<5%).
  • Elevated temperatures (up to 80°C) caused significant decreases in open circuit potential and short circuit current.
  • Perovskite crystal structure remained stable, but hole extraction layers degraded due to additive evaporation.
  • PTAA-based PSCs exhibited lower irreversible performance loss (8.2±1.6%) compared to spiro-OMeTAD (21.6±2.3%) after thermal stress.

Conclusions:

  • Temperature significantly impacts PSC performance, primarily by affecting the hole extraction layer.
  • Additive evaporation from the hole extraction layer is the main cause of performance decline at higher temperatures.
  • PTAA demonstrates superior long-term thermal stability over spiro-OMeTAD for mesoporous triple-cation PSCs.