NTU Singapore Develops Ultra-Thin Transparent Perovskite Solar Cells for Seamless Integration into Windows and Facades

New Atlas Singapore

Overview

Researchers at Nanyang Technological University (NTU) Singapore have developed ultra-thin transparent perovskite solar cells, approximately 50 times thinner than conventional devices, achieving leading efficiencies in their category. Published in ACS Energy Letters, this vacuum-based thermal evaporation technology holds potential to transform building windows, glass facades, and vehicle sunroofs into power-generating surfaces. These color-neutral devices can generate electricity even under diffuse light, offering a groundbreaking solution to urban photovoltaic installation constraints.

In Depth

New Frontier for Urban Photovoltaics

In urban areas, the widespread deployment of conventional opaque solar panels has been limited by land scarcity and the need to maintain building aesthetics. To overcome these challenges, transparent or semi-transparent solar cells offer significant potential to convert underutilized spaces like building windows and facades into power-generating surfaces. A research team at Nanyang Technological University (NTU) in Singapore has made a breakthrough in this field, successfully developing highly practical ultra-thin, semi-transparent perovskite solar cells.

NTU’s Innovative Technology and Device Characteristics

The perovskite solar cells developed by NTU researchers are unique and high-performing in several aspects:

• Ultra-Thin Design: The devices achieve an astonishing thinness, approximately 50 times thinner than typical conventional solar cells. This significantly facilitates their integration into existing window panes and other transparent materials without major structural modifications.
• High-Efficiency Transparency: While being semi-transparent, these cells achieve leading power conversion efficiencies (PCEs) within their category. This allows for effective electricity generation while still permitting natural light to enter indoor spaces.
• Vacuum Thermal Evaporation Process: The manufacturing process employs vacuum-based thermal evaporation. This method enables precise control over film thickness and uniform deposition, which is crucial for forming high-quality perovskite layers with reproducible properties.
• Color-Neutral Appearance: The developed devices are color-neutral, meaning they do not significantly alter the hue of transmitted light. This is a vital characteristic for Building-Integrated Photovoltaic (BIPV) applications, where architectural aesthetics and harmony with the existing landscape are paramount.
• Power Generation Under Diffuse Light: The cells possess the remarkable ability to generate electricity efficiently not only under direct sunlight but also under diffuse light conditions, such as on cloudy days or from indoor lighting. This adaptability is advantageous for maximizing power output in diverse urban lighting environments.

Broadening Applications and Future Outlook

The findings for these ultra-thin, semi-transparent perovskite solar cells have been published in “ACS Energy Letters,” indicating their broad range of potential applications:

• BIPV Applications: They can transform building windows, glass facades, and skylights into smart, power-generating elements. This will contribute to increasing a building’s energy self-sufficiency and achieving net-zero energy buildings.
• Vehicle Applications: The cells can be integrated into vehicle windows, sunroofs of cars and trains, potentially serving as auxiliary power sources or extending driving range for electric vehicles.
• Portable Devices: Given their lightweight and flexible nature, integration into smart devices and IoT sensors is also anticipated, providing a continuous power supply.

NTU’s research offers a fundamental solution to the spatial constraints of photovoltaic installations in urban areas and represents a crucial step towards realizing future smart cities and sustainable architecture. Future efforts will focus on further large-area scalability, long-term durability, and cost-effectiveness.