Self-powered smart window controlled by a high open-circuit voltage InGaN/GaN multiple quantum well solar cell

Area of Science:

• Materials Science
• Optoelectronics
• Renewable Energy

Background:

• Electrochromic devices offer tunable optical properties but often require external power sources.
• Integrating energy harvesting with electrochromic functionality is crucial for self-powered applications.
• Indium Gallium Nitride/Gallium Nitride (InGaN/GaN) multiple quantum wells (MQWs) are known for high open-circuit voltage solar energy conversion.

Purpose of the Study:

• To design and demonstrate a self-powered complementary electrochromic device (CECD).
• To integrate a high open-circuit voltage InGaN/GaN MQW solar cell as the power source for the CECD.
• To evaluate the electrochromic performance, specifically coloration and bleaching times.

Main Methods:

• Fabrication of a CECD system.
• Integration of an InGaN/GaN MQW solar cell to power the CECD.
• Measurement of coloration and bleaching kinetics of the electrochromic device.

Main Results:

• Successful design and operation of a self-powered CECD.
• The integrated InGaN/GaN MQW solar cell provided sufficient voltage to drive the electrochromic switching.
• Achieved coloration time of 5 seconds and bleaching time of 8 seconds.

Conclusions:

• A self-powered CECD driven by an InGaN/GaN MQW solar cell is feasible.
• The developed system exhibits efficient and rapid electrochromic switching.
• This technology holds promise for energy-efficient smart windows and displays.