Imec, a Belgian international R & D and innovation organization that has been active in the field of nano and digital technology, announced that using cross-back contact (IBC) technology on perovskite / silicon tandem cells can achieve a conversion efficiency of 27.1%. Similar to other companies and research institutions engaged in the research and development of this technology, Imec said that by carefully designing its perovskite materials, the efficiency can reach more than 30%. This further proves that this technology can reduce the cost and increase the application prospects of the existing photovoltaic technology.
A tandem cell that achieves 27.1% conversion efficiency includes a 0.13 cm 2 perovskite layer, stacked on top of a 4 cm 2 silicon IBC cell. When the perovskite layer extended to cover the entire 4 square centimeters, the researchers recorded a battery efficiency of 25.3%, and they pointed out that this is still a 23% improvement in the efficiency of silicon cells alone. "The main impact is caused by the interconnection loss from the small area single cell to the series interconnected cell in the 4cm2 module," explains Tom Aernouts, R & D manager of Imec thin-film photovoltaics. "'There is a small series resistance loss in the transparent electrode, but mainly in some areas between the cells used for interconnection. We are working to further reduce these losses."
The researchers also pointed out that if carefully designed, the translucent perovskite layer can minimize the heat loss that occurs in the silicon battery. The team also pointed out that band gap adjustment is a key development to achieve this level of efficiency. "We have been working on this tandem technology for two years," explains Manec, a researcher at Imec, Manoj Jaysankar. "The biggest difference from the previous version is the engineering and processing of the perovskite absorbent, adjusting its band gap to optimize the efficiency of the serial configuration of silicon."
Although the stability of perovskite materials under non-laboratory conditions has always been a major problem that hinders their quantitative production, Imec and other research groups have indicated that great progress has been made in this field. "The long-term stability limiting device is indeed a perovskite battery or component," Aernouts explained. “The inherent stability of the perovskite materials used here is sufficient to conduct thermal testing at 85 ° C for more than 1000 hours, which is a typical IEC standard test condition. In addition, so far, we have not observed from Any negative impact on stability from single cell to interconnected cell. Further stability testing of perovskite is underway, and generally good progress has been made in improving the stability of perovskite PV devices. "
The team from Imec will now focus on driving the efficiency of its tandem cells by more than 30%, and invite companies from the entire supply chain to cooperate with it. Aernouts said that this way of improving efficiency will focus on fine-tuning materials and using new configurations: "In this 4T configuration, further improvements can be obtained by finer adjustment of electrode transparency to reduce losses and range efficiency is 30% "We will also study the 2T configuration, where the optical boundary conditions of the middle electrode are indeed less restrictive, allowing better optical coupling."
Imec's latest efficiency record is close to that of Oxford PV, a perovskite expert in the UK / Germany. The efficiency of this product on a 1cm2 tandem cell reached 27.3%.
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