Cells using low cost perovskite materials are widely viewed as the next generation of solar cells, offering similar power conversion efficiency (PCE) performance as silicon but with lower costs.
The team, with researchers from Peking University and the Universities of Surrey, Oxford and Cambridge, created a technique called Solution-Process Secondary growth (SSG) which increased the voltage of inverted perovskite solar cells by 100mV, reaching a high of 1.21V without compromising the quality of the solar cell or the electrical current flowing through a device. They tested the technique on a device which recorded an efficiency 20.9 per cent, the highest certified for inverted perovskite solar cells.
"Our new technique confirms that there is a lot of promise with perovskite solar cells and we aim to explore this new and exciting area more in the future," said Dr Wei Zhang from the University of Surrey's Advanced Technology Institute. "This global project could provide a solution to the need for a truly sustainable, cheap and clean energy resource," added Professor Ravi Silva, Director of the Institute. "This was a monumental effort from leading laboratories, researchers and institutions from across the world, all working together for the common good."