SOLEXEL's epitaxially grown monocrystalline silicon solar cells achieve 20.1%

At the recent EU PVSEC conference, SOLEXEL made a major announcement regarding their breakthrough in solar technology. The company revealed that its epitaxially grown monocrystalline silicon thin-film solar cells have achieved a remarkable cell conversion efficiency of 20.1%. This innovation is particularly significant because it eliminates the need for traditional silicon ingot formation and wafer cutting processes, which are both time-consuming and costly. By skipping these steps, SOLEXEL claims that the manufacturing cost of their solar modules can be reduced to as low as 0.4 U/W. This could potentially make their technology more competitive in the rapidly evolving solar energy market. SOLEXEL, a startup founded in 2007, currently employs around 50 people. Pawan Kapur, the company’s vice president, highlighted that this was the first time they publicly shared detailed information about their production method. According to the process, a porous silicon film is first created on a substrate. On top of this, a single-crystal silicon layer—acting as the light-absorbing material—is grown through epitaxial growth, with a thickness of 43 micrometers. A metal layer, such as aluminum, is then deposited and patterned using laser techniques to form the electrodes. Finally, a flexible material is applied, allowing the epitaxial silicon film and its upper layers to be separated from the original substrate, which can then be reused. The size of the solar cell is standardized at 156 mm by 156 mm, matching conventional crystalline silicon cells. The 20.1% efficiency figure has been officially verified by the National Renewable Energy Laboratory (NREL). However, SOLEXEL reported that their improved designs have already exceeded 21% efficiency in internal testing. Looking ahead, the company plans to scale up the cell size to 210 mm square and explore the use of alternative materials beyond silicon. These developments could further enhance performance and reduce costs in the future. This progress marks an important step forward in the quest for more efficient and affordable solar power solutions. As the global demand for clean energy continues to rise, companies like SOLEXEL are playing a crucial role in shaping the next generation of solar technology.

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