Fabrication of Energy-Efficient Smart Windows Using All-Solution-Processed Interconnected Ag Transparent Electrodes.

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Transparent conducting electrodes (TCEs) are crucial for optoelectronic devices.
• Indium tin oxide (ITO) is the standard TCE but is expensive due to indium scarcity.
• A cost-effective and scalable alternative to ITO is needed.

Purpose of the Study:

• To develop a scalable, lithography-free method for fabricating silver (Ag) TCEs.
• To demonstrate the tunable optoelectronic properties of the fabricated Ag TCEs.
• To showcase the application of Ag TCEs in transparent heaters and smart windows.

Main Methods:

• Fabrication of Ag thin films using Tollens' reagent.
• Utilization of electrospun polymer fibers as sacrificial masks.
• Selective wet-chemical etching to form an interconnected Ag network.
• Encapsulation with polydimethylsiloxane (PDMS) for mechanical stability.

Main Results:

• Achieved tunable optical transmittance (45–93%) and sheet resistance (13–427 Ω/□).
• Demonstrated Ag/PDMS electrodes as efficient transparent heaters (∼74 °C at 2.5 V).
• Successfully controlled the transparency of hydroxypropyl methylcellulose (HPMC)-based smart windows.

Conclusions:

• A simple, scalable, and complete solution-based fabrication technique for TCEs was established.
• The developed Ag TCEs are suitable for next-generation flexible optoelectronics.
• This lithography-free method offers a promising alternative to traditional TCE fabrication.