Related Experiment Video
Updated: Apr 10, 2026
08:12
Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
10.2K
A Defect-Engineered Vacuum Evaporation Strategy for High-Efficiency Indoor Perovskite Mini Solar Modules
Shih-Han Huang1, Ssu-Yung Chung1, Fang-Chun Su2
1Organic Electronics Research Center, Ming Chi University of Technology, New Taipei City, Taiwan.
Small Methods
|April 9, 2026
Summary
Fully vacuum-evaporated perovskite solar cells (PSCs) achieve record indoor power conversion efficiencies over 41% using a novel sequential evaporation method. This scalable technique enhances phase conversion and reduces defects for improved indoor light harvesting.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Physics
Background:
- Fully vacuum-evaporated perovskite solar cells (PSCs) are promising for indoor photovoltaics due to their solvent-free and scalable nature.
- However, their performance is often hindered by incomplete phase conversion and high defect densities, limiting efficiency.
Purpose of the Study:
- To develop a sequential vacuum-evaporation strategy for high-quality perovskite absorbers optimized for indoor light harvesting.
- To improve phase conversion, reduce defect densities, and enhance the performance and stability of fully evaporated PSCs.
Main Methods:
- A sequential vacuum-evaporation technique involving co-evaporation of PbI2 with PbCl2 to disrupt PbI2 stacking and promote interdiffusion.
- Introduction of a CsI interlayer before thermal annealing to stabilize the perovskite phase and suppress defects.
- Characterization of device performance under indoor lighting conditions (TL84 illumination at 900 and 300 lux).
Main Results:
- Record indoor power conversion efficiencies of 41.60% (900 lux) and 41.22% (300 lux) achieved with optimized fully evaporated PSCs.
- Transient photovoltage and photocurrent analyses indicated prolonged carrier lifetimes and accelerated charge extraction, signifying reduced nonradiative recombination.
- Demonstrated enhanced operational stability and a perovskite mini-module (3.9 cm2) exceeding 38% efficiency at 900 lux.
Conclusions:
- The sequential vacuum-evaporation strategy offers a practical and industrially compatible pathway for high-performance, scalable perovskite photovoltaics.
- This approach effectively addresses challenges of phase conversion and defect formation in fully evaporated PSCs.
- The developed PSCs are well-suited for next-generation self-powered indoor electronic systems.
