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Updated: Jul 9, 2026
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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
Enhancing the Buried Interfacial Interaction to Obtain Homogeneous Halogen-Phase Distribution for Efficient
Zifan Wei1, Yan Zhao1, Yifan Xiang1
1College of Science and School of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 8, 2026
Summary
This study introduces MeS-2PACz, a new material for wide-bandgap perovskite solar cells (PSCs). It significantly improves efficiency and stability by reducing defects and ensuring uniform composition, paving the way for advanced photovoltaic applications.
Area of Science:
- Materials Science
- Photovoltaics
- Solid-State Chemistry
Background:
- Wide-bandgap perovskite solar cells (PSCs) are crucial for tandem applications but face challenges with non-uniform halogen distribution and interface recombination.
- Existing hole-transport materials often fail to adequately address these interfacial issues, limiting device performance and stability.
Purpose of the Study:
- To develop a novel self-assembled monolayer (SAM) hole-transport material, MeS-2PACz, for inverted p-i-n wide-bandgap PSCs (WBG PSCs).
- To enhance interfacial interactions, passivate defects, and improve the structural and electronic properties of the perovskite layer.
- To achieve high power conversion efficiency (PCE) and long-term operational stability in WBG PSCs.
Main Methods:
- Synthesis and characterization of the MeS-2PACz SAM.
- Density Functional Theory (DFT) calculations to investigate interfacial interactions and electronic properties.
- Fabrication and testing of inverted p-i-n WBG PSCs using MeS-2PACz.
- Analysis of perovskite film properties (crystallinity, grain size, phase distribution) and device performance (PCE, stability).
Main Results:
- MeS-2PACz, featuring a methylthio group, strengthens interfacial binding with the perovskite layer through S-Pb coordination, effectively passivating interface defects and reducing trap density.
- The material promotes synchronous crystallization and homogeneous halogen-phase distribution due to balanced binding energies with PbI2 and PbBr2.
- Perovskite films exhibited improved crystallinity, larger grain sizes, and enhanced charge extraction, leading to a champion device PCE of 22.83%.
- Unencapsulated devices maintained over 90% of their initial PCE after 1500 hours of dark storage, indicating superior stability.
Conclusions:
- Molecular engineering of SAMs with functional groups like methylthio is a promising strategy for developing high-performance and stable WBG PSCs.
- MeS-2PACz effectively addresses key challenges in WBG PSCs, including interfacial recombination and phase inhomogeneity.
- The developed material offers a viable pathway for advancing perovskite solar cell technology for tandem photovoltaic applications.
