Singfilm Solar said the result was certified by China’s National PV Industry Measurement and Testing Center (NPVM).
Singapore-based startup Singfilm Solar, a spin-off from the National University of Singapore (NSU), has announced that it has achieved an energy conversion efficiency of 22.6% for a perovskite solar panel.
The result, which was also recorded in Version 64 of the “Efficiency tables for solar cells” in Progress in photovoltaics, was confirmed by China’s National Measurement and Testing Center for PV Industry (NPVM). “These modules use a pin structure, where the p-type hole transport layer is at the bottom, directly below the intrinsic perovskite layer, and the n-type electron transport layer is at the top,” says the company’s CEO and founder. , Hou Yi told pv magazine.
The mini-module design includes eight sub-cells connected in series on a 55mm x 55mm substrate. “The width of each sub-cell has been carefully optimized to 5.6mm to ensure a high fill factor, which is crucial for achieving high overall efficiency,” Yi added. “Each subcell in the module shows impressive performance data with an open-circuit voltage of 1.169 V, a short-circuit current of 25 mA/cm² and a fill factor of 77.4%.”
The solar cells used for the panel rely on the company’s proprietary quasi-mono industrial preparation technology, which is said to enable continuous, high-throughput production on large rigid and flexible substrates. “Accelerated aging tests have confirmed the durability of the commercial product, making Singfilm’s commercial-scale perovskite modules the first to integrate high efficiency, stability and manufacturability,” Yi said, without providing further technical details.
Quasi-mono solar cells are produced with seeded cast silicon, also called cast mono or quasi-mono crystalline silicon. The cast mono process enables the production of ‘mono-like’ wafer material using a modified polycrystalline furnace and avoids expensive investments in billet drawing machines. Cast monowafers are less susceptible to recombination caused by boron-oxygen defects and have the advantage of lower light-induced degradation.
In February, an international research group led by Yi fabricated an inverted perovskite solar cell by combining p-type antimony-doped tin oxides (ATOx) with methyl substmodified carbazole (Me-4PACz) as an intermediate layer between the perovskite absorber and the hole transporting layer (HTL). However, this cell technology was not used for the perovskite solar panel. According to Yi, this intermediate layer reduces the efficiency differences between small and large surface area perovskite cells. Furthermore, he believes that ATOx can easily replace the commonly used nickel oxides (NiOx) as a hole transport material.
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