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Optimizing Self-Assembled Monolayers via Boronic Acid for High-Performance Inverted Perovskite Solar Cells.

Lijun Gao1,2, Jiawei Gao3, Kaixuan Jia1

  • 1State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.

ACS Applied Materials & Interfaces
|September 30, 2025
PubMed
Summary
This summary is machine-generated.

New boronic acid additives improve perovskite solar cell (PSC) performance by preventing self-assembled monolayer aggregation. This enhances film quality, leading to higher power conversion efficiency and improved operational stability in PSC devices.

Keywords:
dipole modulationinterfacial engineeringperovskite solar cellsself-assembled monolayerswettability regulationwetting optimization

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Inverted (p-i-n) perovskite solar cells (PSCs) offer high efficiency and low cost.
  • Self-assembled monolayers (SAMs) like Me-4PACz can aggregate, causing poor film coverage and reduced device performance.

Purpose of the Study:

  • To develop small-molecule additives that suppress SAM aggregation and improve PSC performance.
  • To investigate the impact of boronic acid additives on SAM distribution, energy levels, and charge extraction.

Main Methods:

  • Introduction of 4-methoxyphenylboronic acid (MeO-BOH) and 2-methoxypyridine-5-boronic acid (MeO-N-BOH) as additives.
  • Characterization of interfacial properties including work function and recombination.
  • Fabrication and testing of unencapsulated inverted PSCs with and without additives.

Main Results:

  • Additives effectively regulated intermolecular interactions, suppressed aggregation, and improved SAM distribution.
  • Optimized interfaces showed higher work functions, reduced recombination, and stronger built-in electric fields.
  • PSCs with MeO-N-BOH achieved a 24.75% power conversion efficiency (PCE) and maintained 80.5% of initial efficiency after 700 hours.

Conclusions:

  • Boronic acid additives are a promising strategy for enhancing PSC performance and stability.
  • The developed additives mitigate SAM aggregation issues, leading to superior device characteristics.
  • This approach offers a pathway to more efficient and durable perovskite solar cell technology.