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PETE Devices Could Harvest Solar’s Wasted Heat

Scientists working at the Stanford Institute for Materials and Energy Sciences (SIMES) have improved an innovative solar-energy device to be about 100 times more efficient than its previous design in converting the sun’s light and heat into electricity.

PETE Devices Could Harvest Solar's Wasted Heat

“This is a major step toward making practical devices based on our technique for harnessing both the light and heat energy provided by the sun,” said Nicholas Melosh, associate professor of materials science and engineering at Stanford and a researcher with SIMES, a joint institute of Stanford University and SLAC National Accelerator Laboratory.

The new device is based on the photon-enhanced thermionic emission (PETE) process first demonstrated in 2010. In a report last week in Nature Communications, the group describes how they improved the device’s efficiency from a few hundredths of a percent to nearly 2%, and said they expect to achieve at least another 10-fold gain in the future.

Turning On the Heat

Conventional photovoltaic cells use a portion of the sun’s spectrum of wavelengths to generate electricity. But PETE uses a special semiconductor chip to make electricity by using the entire spectrum of sunlight, including wavelengths that generate heat. In fact, the efficiency of thermionic emission improves dramatically at high temperatures, so adding PETE to utility-scale concentrating solar power plants, such as multi-megawatt power tower and parabolic trough projects in California’s Mojave Desert, may increase their electrical output by 5%. Those systems use mirrors to focus sunlight into super-bright, blazingly hot regions that boil water into steam, which then spins an electrical generator.

“When placed where the sunlight is focused, our PETE chips produce electricity directly; and the hotter it is, the more electricity it will make,” Melosh said.

The heart of the improved PETE chip is a sandwich of two semiconductor layers: One is optimized to absorb sunlight and create long-lived free electrons, while the other is designed to emit those electrons from the device so they can be collected as an electrical current. A cesium oxide coating on the second layer eases the electrons’ passage from the chip. Future research is aimed at making the device up to an additional 10 times more efficient by developing new coatings or surface treatments that will preserve the atomic arrangement of the second layer’s outer surface at the high temperatures it will encounter in the concentrating solar power plant.

Concentrated sunlight (red arrows at the top) heats up the device's semiconductor cathode (beige and grey upper plate) to more than 400 degrees Centigrade. Photoexcited hot electrons (blue dots) stream out of the cathode's nanotextured underside down to the anode (white/gray surface), where they are collected as direct electrical current. Additional solar and device heat is collected below the anode (arrow shows the cool-to-hot, blue-to-red flow) to run electricity-generating steam turbines or Stirling engines. (Credit: Nick Melosh)

Concentrated sunlight (red arrows at the top) heats up the device’s semiconductor cathode (beige and grey upper plate) to more than 400 degrees Centigrade. Photoexcited hot electrons (blue dots) stream out of the cathode’s nanotextured underside down to the anode (white/gray surface), where they are collected as direct electrical current. Additional solar and device heat is collected below the anode (arrow shows the cool-to-hot, blue-to-red flow) to run electricity-generating steam turbines or Stirling engines.
Image Credit: Nick Melosh

“We expect that other materials, such as those incorporating barium or strontium, will make the surface much more stable up to at least 500 degrees Celsius,” said Jared Schwede, a Stanford graduate student who performed many of the PETE experiments, who explains the technology below.

An additional challenge will be to engineer the device to withstand the dramatic 500-degree daily temperature swings at solar power plants, as their systems heat up during the day and then cool down at night.

PETE research has received support from Stanford’s Global Climate and Energy Project, the Gordon and Betty Moore Foundation,  the Department of Energy’s SunShot Initiative and the Defense Advanced Research Projects Agency.

Source: Mike Ross, SLAC National Accelerator Laboratory
Photos & Video: Brad Plummer, SLAC National Accelerator Laboratory
Citation: J.W. Schwede et al., Nature Communications, 12 Mar 2013 (10.1038/ncomms2577)

 
 
 
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programs explore the ultimate structure and dynamics of matter and the properties of energy, space and time -- at the smallest and largest scales, in the fastest processes and at the highest energies -- through robust scientific programs, excellent accelerator-based user facilities and valuable partnerships. Located in Menlo Park, California, SLAC is operated by Stanford University for the U.S. Department of Energy Office of Science.

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