IBM creates 40% more efficient solar cell

The quest to develop a solar technology that can compare on a cost per watt basis with the conventional electricity generation, and also offer the future ability to deploy at the hundreds of gigawatts or greater levels, has become a major challenge that this breakthrough moves us closer to overcoming. IBM does not plan to manufacture solar technologies, but is open to partnering with solar cell manufacturers to demonstrate the technology.

The key part of this solar cell, which is the layer that absorbs most of the light for conversion into electricity, is made entirely with abundant and readily available materials Copper (Cu), Tin (Sn), Zinc (Zn), Sulfur (S) and/or Selenium (Se) and performs at a power conversion efficiency of 9.6 percent, which is 40 percent higher than previous attempts to create a solar cell made of similar materials. Other solar cells which perform at similar efficiency levels are comprised of materials that have been either too costly to produce or contain elements that could limit production capacity, or have poor prospects for further improvements in efficiency, making commercialization and wide usage less likely.

IBM has a long history of pioneering advanced silicon technologies to help enhance performance, while reducing size and power consumption. Such advances include the development of the world’s first copper-based microprocessor; silicon-on-insulator (SOI), a technology that reduces power consumption and increases performance by helping insulate the millions of transistors on a chip; and strained silicon, a technology that “stretches” material inside the silicon decreasing the resistance and speeding the flow of electrons through transistors.

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