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Efficient Inverted Perovskite Solar Cells Utilizing Inorganic Composite Multiple Electron Transport Layers
1Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau, 999078, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 25, 2025
Summary
A new composite electron transport layer (ETL) using tin dioxide and tungsten-doped zinc oxide boosts perovskite solar cell efficiency. This cost-effective inorganic ETL approach achieves a record 23.19% efficiency for inverted perovskite solar cells.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Electron transport layers (ETLs) are crucial for high-performance perovskite solar cells (PSCs).
- Inorganic metal oxide ETLs offer a low-cost, stable alternative to organic ETLs, but fabricating high-quality layers that protect the perovskite remains challenging.
- Defects and deprotonation reactions at the perovskite/ETL interface hinder device performance.
Purpose of the Study:
- To develop a novel inorganic composite electron transport bilayer for efficient inverted perovskite solar cells.
- To investigate the role of tungsten doping in zinc oxide and tin dioxide nanoparticles in enhancing charge extraction and interface stability.
- To demonstrate a cost-effective and scalable fabrication method for high-performance PSCs.
Main Methods:
- Fabrication of a composite ETL comprising atomically coherent interfaced tin dioxide (SnO2) nanoparticles and tungsten-doped zinc oxide (WZO).
- Precise control of tungsten doping ratio in WZO via co-evaporation parameters.
- Characterization of the composite ETL's electronic properties and its effect on the perovskite/ETL interface.
Main Results:
- The SnO2/WZO composite ETL facilitates efficient charge extraction and mitigates interfacial deprotonation reactions.
- Tungsten doping in WZO fine-tunes energy levels for enhanced charge extraction.
- The SnO2 layer passivates perovskite/ETL interface defects and inhibits deprotonation.
- A record power conversion efficiency of 23.19% was achieved for inverted PSCs utilizing this all-inorganic ETL.
Conclusions:
- The developed inorganic composite ETL significantly improves the performance and stability of perovskite solar cells.
- This approach offers a viable pathway for the industrial-scale production of high-efficiency, cost-effective perovskite solar cells.
- The synergistic effect of SnO2 passivation and WZO energy level tuning is key to achieving high performance.
