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Updated: Aug 24, 2025
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
24.20%-Efficiency MA-Free Perovskite Solar Cells Enabled by Siloxane Derivative Interface Engineering
Yuwei Duan1, Kun He1, Lu 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 & Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China.
A new siloxane derivative, diethylphosphatoethylsilicic acid (PSiOH), effectively suppresses defects in perovskite solar cells (PSCs). This modification enhances efficiency and stability by improving the electron transport layer and perovskite interface.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Defects at the interface between TiO2 electron transport layers (ETLs) and perovskite films hinder the efficiency and stability of perovskite solar cells (PSCs).
- Interface engineering is crucial for advancing PSC performance.
Purpose of the Study:
- To develop a novel modifier for the TiO2 ETL/perovskite interface to suppress defects.
- To enhance the efficiency and stability of perovskite solar cells (PSCs) through interface modification.
Main Methods:
- A siloxane derivative, diethylphosphatoethylsilicic acid (PSiOH), was synthesized and used to modify the TiO2 ETL/FA0.83Cs0.17PbI3 perovskite interface.
- Comprehensive characterization techniques were employed to analyze the interface properties and device performance.
- Investigated the role of silicon hydroxyl (SiOH) and phosphate (PO) groups in defect passivation and energy band optimization.
Main Results:
- PSiOH modification formed Si-O-Ti bonds, reducing TiO2 surface defects and optimizing its energy band structure.
- The phosphate group in PSiOH effectively passivated Pb-related defects on the perovskite surface.
- PSiOH-modified PSCs achieved a power conversion efficiency of 24.20% with improved air, thermal, and illumination stabilities.
Conclusions:
- Diethylphosphatoethylsilicic acid (PSiOH) is a highly effective interfacial modifier for high-efficiency and stable perovskite solar cells.
- The study demonstrates the significance of defect passivation at buried interfaces for advancing PSC technology.
- PSiOH offers a promising strategy for developing next-generation perovskite solar cells.
