TL;DR
Researchers from HKUST have created an all-perovskite tandem solar cell without PEDOT:PSS, achieving a record efficiency of 29.1%. This development addresses stability issues and enhances device performance.
Researchers at the Hong Kong University of Science and Technology (HKUST) have developed a PEDOT:PSS-free all-perovskite tandem solar cell that achieves a record efficiency of 29.1%, addressing longstanding stability issues associated with traditional materials.
The team replaced the commonly used PEDOT:PSS hole transport layer (HTL) with a phenothiazine-functionalized self-assembled monolayer called 4PAPT. This substitution improves crystallization, reduces defect density, and enhances interfacial stability, leading to higher efficiency and durability.
The all-perovskite device stacks a wide-bandgap (WBG) perovskite bottom cell with a narrow-bandgap (NBG) top cell, achieving a monolithic tandem structure. The device retained over 90% of its initial efficiency after more than 800 hours of operation under simulated sunlight at around 40°C, demonstrating improved stability compared to traditional designs.
Implications of PEDOT:PSS-Free Design for Solar Stability
This breakthrough could significantly advance perovskite solar technology by addressing stability issues linked to PEDOT:PSS, which is prone to moisture absorption and degradation. The new molecular interface strategy not only boosts efficiency—setting a new record for PEDOT:PSS-free devices—but also enhances long-term operational stability, making perovskite tandem cells more viable for commercial use.
Perovskite Solar Cells
As an affiliate, we earn on qualifying purchases.
As an affiliate, we earn on qualifying purchases.
Background on Perovskite Solar Cell Materials and Stability Challenges
Perovskite solar cells have rapidly increased in efficiency, with tandem configurations pushing beyond 30%. However, the use of PEDOT:PSS as a hole transport layer has limited long-term stability due to its moisture sensitivity and acidity, which can degrade the perovskite layer and cause phase segregation. Researchers have sought alternative materials to improve device durability while maintaining high efficiency.
The recent study builds on prior efforts to optimize interfaces and crystallization processes, but marks the first time a PEDOT:PSS-free all-perovskite tandem has achieved over 29% efficiency, indicating a promising direction for future device stability and performance.
“Replacing PEDOT:PSS with a molecularly designed self-assembled monolayer enables faster, more stable crystallization, leading to higher efficiency and durability.”
— Fengzhu Li, HKUST
DOKIO 100W Portable Foldable Solar Panel Kit (19x26in, 5.3lb), with Separate Controller and Dual USB, Monocrystalline Charger for 12V Batteries & Power Stations, RV Camping Trailer Emergency Backup
【TRAVEL LIGHT, POWER ANYWHERE】 Weighing only 6lb and folding to 19*26*0.5in, this 100W panel is easy to carry,…
As an affiliate, we earn on qualifying purchases.
As an affiliate, we earn on qualifying purchases.
Remaining Questions on Long-Term Stability and Scalability
While the initial results are promising, it is still unclear how these PEDOT:PSS-free devices will perform under real-world conditions over extended periods, beyond the 800-hour testing window. The scalability of the molecular interface fabrication process for commercial production remains to be demonstrated, and further long-term stability data is needed to confirm commercial viability.
860 watt Bifacial Solar Panels,UL61730 Certified 2PCS 430W 24V/48V High Efficiency Solar Panel with A+ Grade Solar Cells for Residential Farm Garden Off Grid Home
1. UL61730 Certified & 30-Year Long Lifespan ETL certified to meet North American safety standards, ensuring compliance with…
As an affiliate, we earn on qualifying purchases.
As an affiliate, we earn on qualifying purchases.
Next Steps for Commercialization and Further Testing
Researchers plan to conduct extended durability testing under varied environmental conditions and explore scalable manufacturing methods for the new molecular interface. Additionally, efforts will focus on integrating these cells into larger modules and assessing their performance in real-world applications.
AlphaGlass Mini Perovskite Solar Panel, 5V 270mW, Indoor & Outdoor Ambient Light Energy Harvesting Module for DIY Electronics, IoT Devices, Sensors, and Wearables (5V, 270, Milliwatts)
Works Indoors & Outdoors – Generates power from ambient indoor lighting, window light, and sunlight
As an affiliate, we earn on qualifying purchases.
As an affiliate, we earn on qualifying purchases.
Key Questions
What makes this solar cell different from previous perovskite devices?
This device replaces the traditional PEDOT:PSS hole transport layer with a phenothiazine-functionalized monolayer, improving stability, crystallization, and efficiency, resulting in a record 29.1% efficiency for PEDOT:PSS-free all-perovskite tandem cells.
Why is removing PEDOT:PSS important?
Removing PEDOT:PSS addresses its moisture sensitivity and acidity, which can degrade perovskite layers and reduce device stability over time, leading to more durable solar cells.
Can this technology be scaled for commercial production?
Scaling remains uncertain at this stage. Further research is needed to develop manufacturing processes that can produce these molecular interfaces reliably and cost-effectively at larger scales.
What are the main benefits of this new design?
The main benefits include higher efficiency, improved stability, and longer operational lifetime, making perovskite tandem solar cells more suitable for practical applications.
When might this technology be available commercially?
There is no specific timeline yet; further testing and development are required before commercial deployment can be considered.
Source: PV Magazine
