26% Increase in Electricity-Generating Potential of Solar Cells by Bouncing Light

A new design by a team of engineers from the University of Minnesota has improved the efficiency of solar cells.

A new twist on an old solar cell design sends light ricocheting through layers of microscopic spheres.

Silicon Boosts Solar Cell Efficiency
The Photovoltaics Technology Transfer Team at the University of New South Wales, collaborating with Centrotherm, have boosted the efficiency of solar cells by using silicon.

By engineering alternating layers of nanometer and micrometer particles, the engineers improved the efficiency of a type of solar cell by as much as 26 percent. These cells, known as dye-sensitized solar cells (DSSC), are made of titanium dioxide (TiO2), a photosensitive material that is less expensive than the more traditional silicon solar cells, which are rapidly approaching the theoretical limit of their efficiency. Current DSSC designs, however, are only about 10 percent efficient.

One reason for this low efficiency is that light from the infrared portion of the spectrum is not easily absorbed in the solar cell. The new-layered design increases the path of the light through the solar cell and converts more of the electromagnetic spectrum into electricity.

The cells consist of micrometer-scale spheres with nanometer pores sandwiched between layers of nanoscale particles. The spheres, which are made of TiO2, act like tightly packed bumpers on a pinball machine, causing photons to bounce around before eventually making their way through the cell. Each time the photon interacts with one of the spheres, a small charge is produced. The interfaces between the layers also help enhance the efficiency by acting like mirrors and keeping the light inside the solar cell where it can be converted to electricity. This strategy to increase light-harvesting efficiency can be easily integrated into current commercial DSSCs.

Wearable Solar Cells To Charge Gadgets on the Move Developed
Charging gadgets while on the move may soon be possible, as scientists have developed a flexible solar cell that can be built into clothing.

The study has been published in AIP's Journal of Renewable and Sustainable Energy.

Source-ANI

One More Step Closer to High-efficiency Plastic Solar Cells
In order to meet the rising demands of energy the US and Austrian scientists have made great strides towards the next generation of plastic solar cells.

Solar Cell Production Goes Up by 50 Percent
The production of solar cells called photovoltaics has gone up 50 percent in 2007. Scientists have said that the production has increased to 3,800 megawatts.