Researchers 3-D print prototype for 'bionic eye'

A team of researchers at the University of Minnesota have, for the first time, fully 3-D printed an array of light receptors on a hemispherical surface. This discovery marks a significant step toward creating a "bionic eye" that could someday help blind people see or sighted people see better.

"Bionic eyes are usually thought of as science fiction, but now we are closer than ever using a multimaterial 3-D printer," said Michael McAlpine, a co-author of the study and University of Minnesota Benjamin Mayhugh Associate Professor of Mechanical Engineering.

Researchers started with a hemispherical glass dome to show how they could overcome the challenge of printing electronics on a curved surface. Using their custom-built 3-D printer, they started with a base ink of silver particles. The dispensed ink stayed in place and dried uniformly instead of running down the curved surface. The researchers then used semiconducting polymer materials to print photodiodes, which convert light into electricity. The entire process takes about an hour.

McAlpine said the most surprising part of the process was the 25 percent efficiency in converting the light into electricity they achieved with the fully 3-D-printed semiconductors.

"We have a long way to go to routinely print active electronics reliably, but our 3-D-printed semiconductors are now starting to show that they could potentially rival the efficiency of semiconducting devices fabricated in microfabrication facilities," McAlpine said. "Plus, we can easily print a semiconducting device on a curved surface, and they can't."

McAlpine and his team are known for integrating 3-D printing, electronics, and biology on a single platform. They received international attention a few years ago for printing a "bionic ear." Since then, they have 3-D printed life-like artificial organs for surgical practice, electronic fabric that could serve as "bionic skin," electronics directly on a moving hand, and cells and scaffolds that could help people living with spinal cord injuries regain some function.

"My mother is blind in one eye, and whenever I talk about my work, she says, "When are you going to print me a bionic eye?" McAlpine said.

McAlpine says the next steps are to create a prototype with more light receptor that are even more efficient. They'd also like to find a way to print on a soft hemispherical material that can be implanted into a real eye.