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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Stabilization of FAPbI3 with Multifunctional Alkali-Functionalized Polymer.

Chenxu Zhao1,2, Hong Zhang2,3, Masaud Almalki2

  • 1State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing, 102206, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|April 6, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces alkali-functionalized polymers to improve perovskite solar cells. The new method enhances power conversion efficiency and operational stability by passivating defects in FAPbI3 films.

Keywords:
alkali-functionalizationlead leakageperovskitespoly(acrylic acid)rubidium

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Defects at interfaces and grain boundaries (GBs) in perovskite films degrade photovoltaic performance and stability.
  • Effective strategies include manipulating crystallization and using molecular passivators to mitigate these issues.

Purpose of the Study:

  • To develop a novel strategy for manipulating FAPbI3 perovskite crystallization.
  • To passivate defects and enhance the performance and stability of perovskite solar cells.

Main Methods:

  • Incorporating alkali-functionalized polymers into the antisolvent solution during perovskite film formation.
  • Utilizing the synergistic effects of alkali cations and poly(acrylic acid) anions for defect passivation.
  • Investigating the interaction between C=O bonds and Pb2+ for reduced lead leakage.

Main Results:

  • Rubidium (Rb)-functionalized poly(acrylic acid) significantly improved the power conversion efficiency of FAPbI3 perovskite solar cells to nearly 25%.
  • The strategy effectively passivated surface and GB defects in perovskite films.
  • Reduced risk of lead ion (Pb2+) leakage was observed due to strong C=O bond interactions.
  • Unencapsulated devices demonstrated enhanced operational stability, retaining 80% efficiency after 500 hours.

Conclusions:

  • Alkali-functionalized polymers offer a promising approach to enhance perovskite solar cell performance and stability.
  • This method effectively addresses critical defect issues and improves device longevity.
  • The findings contribute to the advancement of efficient and stable perovskite photovoltaic technology.