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Singfilm Solar said the result was certified by Chinas National Photovoltaic Industry Testing and Measurement Center (NPVM).
Singapore-based startup Singfilm Solar, a spin-off of the National University of Singapore (NSU), has announced that it has achieved a power conversion efficiency of 22.6% for a perovskite solar panel.
The result, which was also included in Progress in Photovoltaics ’ “solar cell efficiency tables” version 64 , was confirmed by China’s National Photovoltaic Industry Testing and Measurement Center (NPVM). “These modules employ a pin structure, in which the p-type hole transport layer is located at the bottom, directly beneath the intrinsic perovskite layer, and the n-type electron transport layer is on top,” CEO and founder Hou Yi told pv magazine .
The mini-module design features eight subcells connected in series on a 55mm × 55mm substrate. “The width of each subcell has been meticulously 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 exhibits impressive performance, with an open-circuit voltage of 1.169V, a short-circuit current of 25mA/cm², and a fill factor of 77.4%.”
The solar cells used in the panel are based on the company’s proprietary quasi-mono industrial preparation technology, which enables high-performance continuous production on large rigid and flexible substrates. “Accelerated aging tests have confirmed the durability of the commercial product, establishing Singfilm’s commercial-sized perovskite modules as the first to integrate high efficiency, stability and manufacturability,” Yi said, without providing further technical details.
Quasi-mono solar cells are manufactured using seeded cast silicon, also known as mono or quasi-mono cast crystalline silicon. The cast-mono process allows for the production of “mono-like” wafer material using a modified polycrystalline furnace and avoids costly investments in ingot-mining machinery. Cast-mono wafers are less susceptible to recombination caused by boron-oxygen defects and have the advantage of reduced light-induced degradation.
In February, an international research group led by Yi fabricated an inverted perovskite solar cell by placing p-type antimony-doped tin oxides (ATOx) combined with methyl-substituted carbazole (Me-4PACz) as an interlayer between the perovskite absorber and the hole transport layer (HTL). However, this cell technology was not used for the perovskite solar panel. According to Yi, this interlayer reduces the efficiency disparity between small- and large-area perovskite cells. Moreover, he believes that ATOx can easily replace the commonly used nickel oxides (NiOx) as a hole transport material. |
