Transparent Solar Cells Look Promising for Batteries

Thin Solar Cell

 

An emerging class of electrically conductive plastics, called Radical Polymers, are introducing low-cost, transparent solar cells, flexible, lightweight batteries and ultra thin anti-static coatings to consumers electronics and aircraft.

 

Researchers have established the solid-state electrical properties of one such polymer, called PTMA, which is about 10 times more electrically conductive than common semiconducting polymers.

 

“It’s a polymer glass that conducts charge, which seems like a contradiction because glasses are usually insulators,” said Bryan Boudouris, an assistant professor of chemical engineering at Purdue University.

 

The polymer is easy to manufacture and resembles Plexiglas, an inexpensive transparent plastic found in numerous products. However, unlike plexiglas, it conducts electricity.

 

“We make billions of tons of plastic every year.” Boudouris said. “So imagine if you could produce that same kind of material at that same scale but now it has electronic properties.”

 

The PTMA is in a class of electrically active polymers that could bring inexpensive transparent solar cells; anti-static and anti-glare coatings for cell phone displays; anti-static coverings for aircraft to protect against lightning strikes; flexible flash drives; and thermoelectric devices, which generate electricity from heat.

 

Polymers have been used commercially in new types of batteries. However, finding widespread practical applications for the polymers will require increasing the conductivity another 100 to 1,000 times, Boudouris said.

 

Recent research findings were detailed in a paper published online in May in the journal Macromolecules.

 

The review article is authored by Purdue graduate students Edward P. Tomlinson and Martha E. Hay, and Boudouris. The research article published in May was authored by graduate student Lizbeth Rostro, undergraduate student Si Hui Wong, and Boudouris.

 

Polymers are strings of molecules with a central backbone and may contain side chains called “pendant groups” that dangle from the central structure. In radical polymers, it’s these pendant groups that allow charge to be transported, conducting current.

 

To create the radical polymer, the researchers used a procedure called deprotection, which involves replacing a specific hydrogen atom in the pendant group with an oxygen atom, converting it into a so-called radical group.

 

“We just finally studied deprotection in a way others had not to learn how it affects the electronic properties of the radical polymers.” Boudouris said.

 

Electrons surround an atom’s nucleus in “shells,” and these electrons are usually paired. The oxygen atom in PTMA, however has one unpaired electron in its outer shell, making it amenable to transporting charge.

 

“You have to control the deprotection process very well because it makes the conductivity vary by orders of magnitude,” he said.

 

The researchers have determined that the deprotection step can lead to four distinct chemical functionalities of the radical polymer, two of which are promising for increasing the conductivity of the polymer.

 

“So manipulating the reaction conditions for this deprotection step, and monitoring closely the resultant chemical functionalities, is critical in turning the electrical properties of radical polymers,” Boudouris said.


The research is ongoing and has been funded by the National Science Foundation (NSF), the Air Force Office to Scientific Research (AFOSR) and the Defense Advanced Research Projects Agency (DARPA).

 

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