Major advance in solar cells made from cheap, easy-to-use perovskite
Soar cells made from an inexpensive and increasingly popular material called perovskite can more efficiently turn sunlight into electricity using a new technique to sandwich two types of perovskite into a single photovoltaic cell.
Perovskite solar cells are made of a mix of organic molecules and inorganic elements that together capture light and convert it into electricity, just like today’s more common silicon-based solar cells. Perovskite photovoltaic devices, however, can be made more easily and cheaply than silicon and on a flexible rather than rigid substrate. The first perovskite solar cells could go on the market next year, and some have been reported to capture 20 percent of the sun’s energy.
In a paper appearing online today in advance of publication in the journal Nature Materials, University of California, Berkeley, and Lawrence Berkeley National Laboratory scientists report a new design that already achieves an average steady-state efficiency of 18.4 percent, with a high of 21.7 percent and a peak efficiency of 26 percent.
Cross section of the new solar cell, showing the two perovskite layers (beige and red) separated by a single-atom layer of boron nitride and the thicker graphene aerogel (dark gray), which prevents moisture from destroying the perovskite. Gallium nitride (blue) and gold (yellow) electrodes channel the electrons generated when light hits the solar cell.
from Next Big Future http://bit.ly/2eVw6JE
from Wonders of Graphene – GrapheneEntrepreneur.com – Graphene News & Latest Graphene Uses http://www.grapheneentrepreneur.com/major-advance-in-solar-cells-made-from-cheap-easy-to-use-perovskite/