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Flash Infrared Annealing for Perovskite Solar Cell Processing
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Low-Temperature Processed Brookite Interfacial Modification for Perovskite Solar Cells with Improved Performance.

Jiandong Yang1, Jun Wang2, Wenshu Yang1

  • 1State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.

Nanomaterials (Basel, Switzerland)
|October 27, 2022
PubMed
Summary

Engineered titanium dioxide (TiO2) nanorod scaffolds with brookite nanoparticles improve perovskite solar cell efficiency by 56.37%. This novel structure enhances electron transport and reduces recombination for better performance.

Keywords:
brookiteenergy bandinterfacial modificationnanorodsperovskite solar cellpore filling

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Scaffold layers are crucial for electron transport and preventing recombination in perovskite solar cells (PSCs).
  • Interface engineering between scaffold and light absorption layers is key for enhancing PSC performance.

Purpose of the Study:

  • To fabricate and characterize a novel TiO2 nanostructure for improved PSCs.
  • To investigate the effect of brookite TiO2 nanoparticles on PSC performance.

Main Methods:

  • Vertically grown TiO2 nanorods (NRs) were fabricated as scaffold layers.
  • A thin brookite TiO2 nanoparticle (NP) layer was formed on rutile NRs using chemical bath deposition (CBD) with TiCl4 treatment and low-temperature annealing (150 °C).

Main Results:

  • The TiO2 NR/brookite NP structure achieved a power conversion efficiency (PCE) of 15.2%, a 56.37% increase compared to bare NRs (9.72%).
  • The engineered structure demonstrated improved pore filling, enhanced carrier transport, and reduced trap-assisted recombination.
  • Brookite NPs formed at low temperatures offered a more suitable edge potential for electron transfer than anatase NPs.

Conclusions:

  • Low-temperature fabricated brookite TiO2 nanostructures show significant potential for high-performance flexible PSCs.
  • Interface modification with brookite TiO2 nanoparticles is an effective strategy to boost PSC efficiency.