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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Tailoring Mixed-Halide, Wide-Gap Perovskites via Multistep Conversion Process.

Dowon Bae1,2, Axel Palmstrom2, Katherine Roelofs3

  • 1Center for Individual Nanoparticle Functionality, Department of Physics, Technical University of Denmark , Building 311, Fysikvej, DK-2800 Kgs, Lyngby, Denmark.

ACS Applied Materials & Interfaces
|May 27, 2016
PubMed
Summary

Researchers optimized perovskite solar cells by controlling the spin-coating process for lead iodide (PbI2) films. Modifying spin rates and deposition improved film morphology, leading to enhanced solar cell performance without extra treatments.

Keywords:
lead-halidemultistep depositionorganic−inorganic hybridsphotovoltaicsspin-coating

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Wide-band-gap mixed-halide perovskite solar cells are promising for renewable energy applications.
  • The performance of perovskite solar cells is highly dependent on the morphology and structure of the precursor films, such as lead iodide (PbI2).
  • Optimizing film morphology often requires complex chemical or thermal post-treatments.

Purpose of the Study:

  • To investigate the impact of spin-coating parameters on the morphology of PbI2 films for mixed-halide perovskite solar cells.
  • To establish a facile method for controlling PbI2 film configuration and surface morphology.
  • To enhance the device performance of perovskite solar cells through optimized precursor film preparation.

Main Methods:

  • Sequential spin-coating process was employed to prepare mixed-halide (CH3NH3PbI3-XBrX) perovskite solar cells.
  • Spin-coating parameters, including spin rate and repetitive deposition of PbI2, were systematically varied.
  • Cross-sectional shape and surface morphology of the perovskite films were analyzed.

Main Results:

  • Spin rate and repetitive deposition of PbI2 significantly influence the cross-sectional shape and surface morphology of the resulting perovskite films.
  • Perovskite solar cells fabricated with a PbI2 precursor layer exhibiting a dense bottom and porous top configuration achieved superior device performance (J-V performance).
  • This morphology control was achieved solely by adjusting spin-coating parameters, without additional chemical or thermal post-treatments.

Conclusions:

  • Spin-coating parameter modification offers a straightforward and effective strategy for controlling PbI2 film morphology in perovskite solar cell fabrication.
  • Optimized PbI2 film morphology, specifically a dense-bottom/porous-top structure, is crucial for achieving high-performance perovskite solar cells.
  • This approach provides a facile route to enhance perovskite solar cell efficiency without complex post-processing steps.