Breakthrough in Perovskite Solar Technology: Stable Tandem Cells with Record Efficiency

Stable All-Perovskite Tandem Solar Cells

Published: June 24, 2025

A significant leap forward in solar energy research has been made by scientists at the Ningbo Institute of Materials Technology and Engineering (NIMTE), part of the Chinese Academy of Sciences. Under the leadership of Prof. Ge Ziyi, the team has successfully developed a new design for all-perovskite tandem solar cells (TSCs) that exhibit exceptional efficiency and long-term stability, thanks to a novel interface engineering strategy involving boric acid-functionalized monolayers.

The Perovskite Advantage

Perovskites have emerged as one of the most promising materials in photovoltaics due to their high light absorption, tunable bandgap, and cost-effective processing. In tandem solar cell configurations, two perovskite layers—one with a wide bandgap (WBG) and one with a narrow bandgap (NBG)—are stacked to capture different parts of the solar spectrum, significantly improving conversion efficiency.

Solving the Stability Challenge

One major obstacle in all-perovskite TSCs has been the corrosion of NiOx, a common hole-transporting material, by strongly acidic phosphoric acid groups in self-assembled monolayers (SAMs). This degradation not only reduces device performance but also threatens its stability under operational conditions.

The research team tackled this issue by replacing the phosphoric acid with boric acid (BA), creating BA-SAMs that form stronger, more uniform bonds with the NiOx surface through -BO₂⁻ coordination. This strategy reduces molecular aggregation and improves the uniformity of the monolayer, leading to a significant enhancement in both efficiency and durability.

Record-Setting Efficiency

With this innovation, the researchers achieved a 20.1% power conversion efficiency (PCE) in the wide-bandgap top cell. When combined with a narrow-bandgap bottom cell in a tandem configuration, the device delivered a total PCE of 28.5%.

Even more impressively, the solar cell retained 90% of its initial efficiency after 500 hours of continuous illumination under simulated sunlight—demonstrating a key milestone in commercial viability for perovskite solar technology.

Path to Commercialization

This study, published in Nature Communications, sets a new benchmark for future TSC development. By enabling more durable interfaces through less acidic SAMs, the findings are expected to accelerate the commercialization of perovskite photovoltaics. The researchers emphasize that this interface engineering method could be generalized to other perovskite-based devices.

📘 Read the original article on TechXplore:
https://techxplore.com/news/2025-06-scientists-stable-perovskite-tandem-solar.html

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#PerovskiteSolarCells #TandemSolar #Photovoltaics #EnergyTech #SolarInnovation #ChineseAcademyOfSciences #InterfaceEngineering #PWmat #QuantumServerNetworks

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