NTU researchers develop ultra-thin transparent solar cells

🔑 Enhanced Key Takeaways

•The NTU transparent solar cells are perovskite-based and are exceptionally thin, approximately 10,000 times thinner than a human hair and 50 times thinner than conventional perovskite solar cells.
•These semi-transparent cells achieve a power conversion efficiency of 7.6% while allowing 41% of visible light to pass through, a performance among the best reported for similar materials.
•The manufacturing process utilizes an industrially compatible vacuum-based thermal evaporation method, which facilitates the deposition of very thin and uniform perovskite layers over large areas and avoids the use of toxic solvents, making it suitable for large-scale production.
•The technology is designed to be color-neutral, ensuring seamless integration into architectural elements like windows and building facades without compromising their aesthetic appearance.
•In related research, NTU has also demonstrated significant advancements in perovskite solar cell stability and efficiency, achieving 25.1% power conversion efficiency in inverted perovskite solar cells with over 93% retention after 1,000 hours of operation.

📊 Competitor Analysis▸ Show

Competitor Analysis: Transparent Solar Cell Technologies

Feature / Company/Institution	NTU (Perovskite)	Michigan State University (TLSC)	Brite Solar (Agri-PV)	Onyx Solar (BIPV)	Ubiquitous Energy (ClearView Power)	Heliatek GmbH (Organic PV)	South Korean Researchers (Perovskite)
Core Technology	Ultra-thin Perovskite	Transparent Luminescent Solar Concentrators (TLSC)	Nanocoating-based Solar Glass	BIPV (Skylights, Facades)	Transparent Solar Coating (UV/IR absorption)	Organic Photovoltaics (OPV)	Perovskite
Transparency (Visible Light)	41% (for 7.6% eff.)	Fully transparent (48.5% with Ag electrodes)	High transparency for agriculture/architecture	Clear and flexible	Allows visible light through	60%	Completely see-through
Power Conversion Efficiency	7.6% (semi-transparent), up to 12% (opaque), 25.1% (inverted PSC, separate research)	~1% (aiming for 5%), ~10% (fully transparent PV glass)	Focus on enhancing energy production	Not specified, focus on aesthetics/flexibility	9.8%	7.2%	14% (achieved Summer 2024)
Key Applications	Windows, facades, vehicles, wearables	Windows, buildings, mobile phones	Greenhouses, architectural applications	Skylights, canopies, facades	Architectural glass windows, net-zero buildings	South-facing glass buildings	Mobile phones, general transparent surfaces
Manufacturing Process	Thermal evaporation (vacuum-based)	Organic molecules (polypropylene)	Nanocoating	Not specified, BIPV integration	Direct application to architectural glass	Not specified, partially clear	Not specified, completely see-through design
Commercial Availability/Stage	Research/Prototype stage, talks with companies for validation	Research stage	Current products on market, scaling up production	Current products on market	Not yet available to public, selling through window manufacturers	Commercial products available	Research/Demonstration (charged mobile phone)
Unique Selling Proposition	Ultra-thin, color-neutral, high efficiency for thinness	Fully transparent by absorbing UV/IR, emitting IR to edges	Enhances crop yields in agriculture	Niche BIPV solutions, flexibility	ClearView Power coating, enhances energy efficiency by blocking IR heat	Partially transparent, lower solar heat gain	High efficiency with completely see-through design
Pricing	Null	Null	Null	Null	Null	Null	Null

🛠️ Technical Deep Dive

Material: The core semiconductor material used in NTU's ultra-thin transparent solar cells is perovskite.
Thickness: The perovskite solar cells are remarkably thin, approximately 10,000 times thinner than a strand of human hair and about 50 times thinner than conventional perovskite solar cells. The ultrathin perovskite absorber layers can be as thin as 10 nanometres.
Manufacturing Method: The NTU team employs an industrially compatible method called thermal evaporation. This vacuum-based process involves heating source materials in a vacuum chamber until they evaporate, with the vapor then settling on a surface to form a thin, uniform film. This method avoids toxic solvents and is suitable for depositing uniform layers over large areas.
Power Conversion Efficiency (PCE) & Transparency:
- For semi-transparent cells with a 60-nanometre-thin perovskite layer, a PCE of 7.6% was achieved with approximately 41% visible light transmittance.
- For opaque devices, PCEs were reported as 7% for 10nm layers, 11% for 30nm layers, and 12% for 60nm perovskite layers.
Color Neutrality: The developed solar cells are semi-transparent and color-neutral, allowing them to be integrated into windows and facades without altering the visual appearance.
Earlier Perovskite Efficiency Milestones (NTU):
- In July 2020, NTU achieved an 18.1% PCE for perovskite solar mini modules of 21 cm² using thermal co-evaporation.
- In November 2025, NTU researchers demonstrated inverted perovskite solar cells with a 25.1% PCE for a 1-cm² prototype, maintaining over 93% of initial efficiency after 1,000 hours of operation at 85 °C.

🔮 Future ImplicationsAI analysis grounded in cited sources

Transparent solar cells will become a standard component in building materials, significantly contributing to urban renewable energy generation.

The ultra-thin, transparent, and color-neutral nature of NTU's perovskite cells makes them ideal for seamless integration into windows and facades, transforming buildings into active power generators without compromising aesthetics.

The industrial compatibility of the thermal evaporation manufacturing process will enable cost-effective, large-scale production of transparent solar cells.

The vacuum-based thermal evaporation method, which avoids toxic solvents and allows for uniform deposition over large areas, addresses key challenges in scaling up production for commercial deployment.

This technology will expand the application of solar power beyond traditional panels to a wide array of surfaces, including vehicles and portable electronics.

The thinness and flexibility potential of perovskite solar cells allow for their integration into diverse surfaces like car windows, smart glasses, and other lightweight electronics, enabling ubiquitous energy harvesting.

⏳ Timeline

2011-10

NTU develops highly efficient and cheaper silicon thin-film solar cells using nanostructure technology.

2013-10

NTU researchers explain the workings of perovskite solar cells, noting their potential for high efficiency (up to 15%), flexibility, and lower cost.

2014-03

NTU scientists develop a perovskite material that can function as a solar cell by day and emit light by night, highlighting its semi-translucent properties for window applications.

2020-07

NTU researchers achieve a record 18.1% power conversion efficiency for a 21 cm² perovskite solar mini module using thermal co-evaporation.

2025-08

NTU scientists develop a method to enhance the stability and efficiency of perovskite solar cells, achieving 25.1% efficiency in a 1-cm² prototype with high operational stability.

2026-05

NTU researchers develop ultra-thin, transparent perovskite solar cells (10,000 times thinner than human hair) with 7.6% efficiency and 41% visible light transparency using an industrially compatible thermal evaporation method.

NTU researchers develop ultra-thin transparent solar cells

⚡ 30-Second TL;DR

Key Points

🧠 Deep Insight

🔑 Enhanced Key Takeaways

Competitor Analysis: Transparent Solar Cell Technologies

🛠️ Technical Deep Dive

🔮 Future ImplicationsAI analysis grounded in cited sources

⏳ Timeline

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