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Efficient Air-Processed MA-Free Perovskite Solar Cells by SH-Based Silane Interface Modification.

Xinlei Gan1, Jing Zhang2, Yanjun Xing2

  • 1College of Science and Technology, Ningbo University, Ningbo 315300, China.

ACS Applied Materials & Interfaces
|June 5, 2024
PubMed
Summary

Researchers optimized air-processed perovskite solar cells (PSCs) by modifying the interface with 3-mercaptopropyltrimethoxysilane (MPTMS). This MPTMS modification enhances perovskite crystallization and reduces defects, leading to improved efficiency and stability in methylamine-free PSCs.

Keywords:
MPTMSenergy levelinterface modificationnickel oxideperovskite

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Air-processed perovskite solar cells (PSCs) offer reduced production costs and promote industrialization.
  • The buried interface in PSCs critically impacts perovskite crystallization and charge transport, directly influencing device performance.
  • Optimizing this interface is key for developing efficient and stable PSCs.

Purpose of the Study:

  • To enhance the performance and stability of air-processed perovskite solar cells (PSCs) by optimizing the buried interface.
  • To investigate the effects of introducing 3-mercaptopropyltrimethoxysilane (MPTMS) on the nickel oxide (NiO) surface.
  • To develop efficient methylamine-free (MA-free) PSCs through interface engineering.

Main Methods:

  • Surface modification of nickel oxide (NiO) with 3-mercaptopropyltrimethoxysilane (MPTMS).
  • Analysis of perovskite film crystallization and interface properties.
  • Fabrication and characterization of air-processed methylamine-free (MA-free) PSCs.

Main Results:

  • MPTMS modification enhanced perovskite crystallization by increasing surface hydrophobicity.
  • The thiol functional group of MPTMS passivated interface defects and reduced non-radiative recombination.
  • Improved energy level alignment between NiO and perovskite layers led to a higher open-circuit voltage.
  • Achieved a photoelectric conversion efficiency (PCE) of 21.0% for air-processed MA-free PSCs.
  • Devices maintained 85% of their initial PCE after 1000 hours of aging.

Conclusions:

  • Interface modification with MPTMS is a viable strategy for improving air-processed MA-free PSCs.
  • MPTMS enhances perovskite crystallization, passivates defects, and optimizes energy levels, leading to high PCE and stability.
  • This approach facilitates the industrialization of cost-effective and efficient perovskite solar technology.