New tech enables solar cells to absorb more light
A team of scientists at Stanford University, that includes an Indian origin researcher, have discovered how to make the shiny upper metal contact...
New York: A team of scientists at Stanford University, that includes an Indian origin researcher, have discovered how to make the shiny upper metal contact 'invisible' to light, thereby funnelling light directly into the cell.
Their findings could lead to a new paradigm in the design and fabrication of solar cells. In most solar cells, the upper contact consists of a metal wire grid that carries electricity to or from the device. But these shiny wires also prevent sunlight from reaching the semiconductor.
"Using nanotechnology, we have developed a novel way to make the upper metal contact nearly invisible to incoming light," said study lead author Vijay Narasimhan, who conducted the work as a graduate student at Stanford. "The more metal you have on the surface, the more light you block.
That light is then lost and cannot be converted to electricity," explained study co-author Yi Cui, an associate professor of materials science and engineering.