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Could Solar panels one day be as inexpensive as paint?

14 May 2013

Plasmonic-enhanced organic photovoltaic materials are made (or processed) in liquid form and can be applied to a greater variety of surfaces.

Qiaoqiang Gan, University at Buffalo assistant professor of electrical engineering

Researchers such as Qiaoqiang Gan, University at Buffalo assistant professor of electrical engineering, are helping develop a new generation of photovoltaic cells that produce more power and cost less to manufacture than what is currently available today.

One of the more promising efforts, which Gan is working on, involves the use of plasmonic-enhanced organic photovoltaic materials. These devices don’t match traditional solar cells in terms of energy production but they are less expensive and - because they are made (or processed) in liquid form - can be applied to a greater variety of surfaces.

Currently, solar power is produced with either thick polycrystalline silicon wafers or thin-film solar cells made up of inorganic materials such as amorphous silicon or cadmium telluride. Both are expensive to manufacture.

“Compared with their inorganic counterparts, organic photovoltaics can be fabricated over large areas on rigid or flexible substrates potentially becoming as inexpensive as paint,” Gan claims. The reference to paint does not include a price point but rather the idea that photovoltaic cells could one day be applied to surfaces as easily as paint is to walls, he adds.

There are drawbacks to organic photovoltaic cells. They have to be thin due to their relatively poor electronic conductive properties. Because they are thin and, thus, without sufficient material to absorb light, it limits their optical absorption and leads to insufficient power conversion efficiency. Their power conversion efficiency needs to be 10 percent or more to compete in the market.

To achieve that benchmark, Gan and other researchers are incorporating metal nanoparticles and/or patterned plasmonic nanostructures into organic photovoltaic cells. Plasmons are electromagnetic waves and free electrons that can be used to oscillate back and forth across the interface of metals and semiconductors.

Recent material studies suggest they are succeeding, he said. Gan and co-workers argue that, because of these breakthroughs, there should be a renewed focus on how nanomaterials and plasmonic strategies can create more efficient and affordable thin-film organic solar cells.

Professor Gan and co-authors describe the progress of plasmonic-enhanced organic photovoltaic materials in the May 7 edition of the journal Advanced Materials. The paper, which includes an image of a plasmonic-enhanced organic photovoltaic device on the journal’s front page, is available here.

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