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Full-frame and high-contrast smart windows from halide-exchanged perovskites
You Liu1, Jungan Wang1, Fangfang Wang1
1Key Laboratory of Flexible Electronics (KLOFE) & Institution of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), Nanjing, Jiangsu, China.
Nature Communications
|June 8, 2021
Summary
This study introduces a new photovoltachromic smart window technology. It offers high transparency and adjustable light control, improving building energy efficiency.
Area of Science:
- Materials Science
- Energy Science
- Optoelectronics
Background:
- Window glazing is crucial for managing indoor light and heat, impacting building energy costs.
- Photovoltachromic technology offers a promising solution for smart windows, but challenges remain in achieving full active area and high contrast ratios.
Purpose of the Study:
- To develop a novel photovoltachromic device for smart windows.
- To overcome limitations in active area and contrast ratio for practical smart window applications.
Main Methods:
- Fabrication of a photovoltachromic device using a vertical tandem architecture.
- Integration of a full-transparent perovskite photovoltaic component with an ion-gel based electrochromic component.
- Adjustment of the halide-exchanging period to optimize device performance.
Main Results:
- Achieved a high pristine transmittance of up to 76%.
- Demonstrated a wide contrast ratio (>30%) in average visible transmittance (400-780 nm).
- Exhibited an excellent color-rendering index of 96.
- Device shows self-adaptable transmittance adjustment for automatic indoor brightness and temperature control.
Conclusions:
- The developed photovoltachromic device addresses key challenges in smart window technology.
- This innovation offers significant potential for energy savings in buildings through intelligent light and heat modulation.
