Swedish advanced materials start-up Sol Voltaics has confirmed the successful alignment and orientation of nanowires in a thin film.
The achievement represents the most significant technology milestone in solar nanowire manufacturing to date, paving the way for photovoltaic (PV) module efficiencies of 27% or more—a 50% boost in energy conversion efficiencies for today’s solar modules, the company said.
While showing highly promising characteristics in solar energy generation, nanowires are notoriously difficult to align due to their high aspect ratios and material characteristics. By controlling nanowire orientation and alignment at centimeter scale on standard-sized wafers, Sol Voltaics has taken a major step toward the commercial production of solar films for tandem solar PV modules, a statement from the company aid.
Erik Smith, CEO of Sol Voltaics, said, “Gallium arsenide (GaAs) nanowires have recently come to the forefront as holding great promise for boosting solar module efficiencies well beyond current levels. By aligning nanowires within a membrane, we’ve taken our greatest stride yet toward manufacturing solar nanowire films at the commercial scale. This will enable solar panel manufacturers to greatly enhance the energy-generating capability of their products.”
The latest milestone follows Sol Voltaics’ 2015 announcement that the Fraunhofer-ISE confirmed a world-record PV conversion efficiency of 15.3% for the company’s epitaxially grown GaAs nanowire solar cells. The cells were recently retested by Fraunhofer and showed little or no degradation nearly 18 months after the initial tests, reaffirming the technology’s performance reliability.
In addition to the nanowire alignment breakthrough, Sol Voltaics has progressed through several generations of development of its Aerotaxy production technology. The patented process allows cost-effective III-V nanowire solar cell production via a continuous gas phase process.