Printable, wide band-gap chalcopyrite thin films for power generating window applications

Area of Science:

• Materials Science
• Renewable Energy
• Semiconductor Physics

Background:

• Wide band-gap semiconductor films are crucial for advanced photovoltaic applications.
• Bifacial solar cells offer potential for increased energy yield by capturing light from both sides.
• Transparent conducting oxide substrates are essential for fabricating efficient solar devices.

Purpose of the Study:

• To synthesize printable, wide band-gap copper indium gallium sulfide (CuInGaS2, CIGS) films.
• To investigate the bifacial properties of these CIGS films for power generating window applications.
• To evaluate the synergistic effect of bifacial illumination on solar cell efficiency.

Main Methods:

• Synthesis of printable, wide band-gap CIGS films on transparent conducting oxide substrates.
• Fabrication of solar cell devices using the synthesized CIGS films.
• Measurement of power conversion efficiency under front, rear, and bifacial illumination conditions.

Main Results:

• The synthesized CIGS films exhibit wide band-gap, semi-transparent, and bifacial properties.
• Solar cells demonstrated a synergistic efficiency increase of 5.4-16.3% under bifacial illumination.
• The efficiency enhancement was not significantly influenced by the rear-side light intensity, indicating utility with weak light.

Conclusions:

• Printable, wide band-gap CIGS films are promising for bifacial solar cells and power generating windows.
• The synergistic effect in bifacial illumination allows for efficient energy harvesting, even in low-light conditions.
• These findings pave the way for improved solar energy conversion in diverse environments.