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Tunneling a path to low cost, high efficiency solar cells

(Nanowerk News) Lowering the cost of solar cell production and making it more affordable to individuals and businesses could be a game-changer for the energy sector.
That is one of the reasons behind the U.S. Department of Energy's 2011 launch of the SunShot Initiative, a national effort to drive down the cost of solar electricity and support solar adoption.
An important area of focus for this effort is photovoltaic (PV) research and development. Solar cells consist of a photovoltaic material - a substance that can transform sunlight into electricity. Traditional methods of producing the photovoltaic material requires many steps and a lot of energy to make, driving up the cost.
According to Nicholas C. Strandwitz, assistant professor of materials science and engineering at Lehigh University, one path to reducing the cost of solar cells is to reduce the amount of energy it takes to process silicon into a solar cell.
Strandwitz was recently awarded a grant as part of the SunShot Initiative's Photovoltaics Research and Development 2 funding program, which seeks to transform PV module design, explore high-risk emerging technology research, and devices and designs that facilitate rapid solar installation. Projects under this program will investigate new solar technology innovations that have the potential to make solar power affordable throughout the United States.
Strandwitz will explore a promising technique to manufacture solar cells using atomic layer deposited (ALD) tunnel barriers, which are barriers that are so thin, electrons can literally "tunnel" through them. He and his team will quantify the electronic behavior of silicon cells made with this ALD tunnel barrier combined with metal oxide materials that selectively transport electrons with specific energies.
According to Strandwitz, the creation of thin film layers and interfaces with the right electronic properties can result in high efficiency photovoltaics, while decreasing the cost of production.
"Controlling interfaces and directing electron flow is essential for creating efficient solar cells," says Strandwitz.
He and his team will quantify the electronic behavior of these contacts, which may constitute some of the most efficient electrical contacts to silicon photovoltaics to date.
"ALD can grow 1 nanometer-thick films very reliably, making it a controllable and scalable way to control the properties of the silicon surface," says Strandwitz. "This ALD fabrication technique could make next generation solar cells more efficient and, ultimately, more inexpensive to manufacture."
Source: By Lori Friedman, Lehigh University
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