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Chelate-Pb Intermediate Engineering for High-Efficiency Perovskite Solar Cells.

Jinzhi Niu1, Dong Yang1,2, Zhou Yang1

  • 1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering . Shaanxi Normal University , Xi'an 710119 , China.

ACS Applied Materials & Interfaces
|April 12, 2018
PubMed
Summary

Adding 1,8-octanedithiol to formamidinium cesium lead iodide perovskite solutions significantly improves film quality. This results in higher efficiency for perovskite solar cells.

Keywords:
1,8-octanedithioladditivechelate intermediategrain sizeperovskite

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Chemical Engineering

Background:

  • High-performance perovskite solar cells depend critically on crystallization quality and grain size.
  • Solution processing offers a cost-effective route for fabricating perovskite photovoltaics.

Purpose of the Study:

  • To investigate the effect of 1,8-octanedithiol as an additive in formamidinium cesium lead iodide (FA0.95Cs0.05PbI3) solutions.
  • To enhance the film quality and photovoltaic performance of planar-type perovskite solar cells.

Main Methods:

  • Incorporation of 1,8-octanedithiol into FA0.95Cs0.05PbI3 precursor solutions.
  • Solution processing for fabricating perovskite films.
  • Characterization of film morphology, crystal quality, and optoelectronic properties.
  • Fabrication and testing of planar-type perovskite solar cells.

Main Results:

  • 1,8-Octanedithiol coordinates with lead, forming a chelate-Pb compound that lowers Gibbs free energy during crystallization.
  • This additive facilitates the formation of high-quality FA0.95Cs0.05PbI3 films with larger grains and smoother surfaces.
  • Films exhibited reduced electron trap densities and extended carrier lifetimes compared to control samples.
  • The champion power conversion efficiency increased from 18.39% to 19.36% with 3% 1,8-octanedithiol doping.

Conclusions:

  • 1,8-Octanedithiol is an effective additive for improving the quality of perovskite films via solution processing.
  • The enhanced film properties translate to improved performance in planar-type perovskite solar cells.
  • This technique presents a promising strategy for fabricating high-efficiency perovskite photovoltaics.