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Berkeley Lab researchers produce first ultrathin sheets of perovskite hybrids September 26th, 2015announcements Zenyatta Ventures Ltd.
Berkeley Lab researchers produce first ultrathin sheets of perovskite hybrids September 26th, 2015interviews/Book reviews/Essays/Reports/Podcasts/Journals/White papers A new single-molecule
Berkeley Lab researchers produce first ultrathin sheets of perovskite hybrids September 26th, 2015tools A new single-molecule tool to observe enzymes at work September 28th,
#Perovskites provide big boost to silicon solar cells Stacking perovskites onto a conventional silicon solar cell dramatically improves the overall efficiency of the cell,
The researchers describe their novel perovskite-silicon solar cell in this week edition of the journal Energy & Environmental science. ee been looking for ways to make solar panels that are more efficient and lower cost,
Perovskite is a crystalline material that is inexpensive and easy to produce in the lab. In 2009,
scientists showed that perovskites made of lead, iodide and methylammonium could convert sunlight into electricity with an efficiency of 3. 8 percent.
Since then, researchers have achieved perovskite efficiencies above 20 percent, rivaling commercially available silicon solar cells and spawning widespread interest among silicon manufacturers. ur goal is to leverage the silicon factories that already exist around the world,
and add a layer of perovskite at relatively low cost. Sunlight to electricity Solar cells work by converting photons of sunlight into an electric current that moves between two electrodes.
while perovskite cells harvest only the visible part of the solar spectrum where the photons have more energy.
perovskite stacked on top of CIGS (copper indium gallium diselenide). COURTESY: Colin Bailie, Stanford bsorbing the high-energy part of the spectrum allows perovskite solar cells to generate more power per photon of visible light than silicon cells,
Bailie said. A key roadblock to building an efficient perovskite-silicon tandem has been a lack of transparency. olin had to figure out how to put a transparent electrode on the top
so that some photons could penetrate the perovskite layer and be absorbed by the silicon at the bottom,
Mcgehee said. o one had made ever a perovskite solar cell with two transparent electrodes. Perovskites are damaged easily by heat and readily dissolve in water.
This inherent instability ruled out virtually all of the conventional techniques for applying electrodes onto the perovoskite solar cell
so Bailie did it manually. e used a sheet of plastic with silver nanowires on it, he said. hen we built a tool that uses pressure to transfer the nanowires onto the perovskite cell, kind of like a temporary tattoo.
You just need to rub it to transfer the film. Remarkable efficiency For the experiment, the Stanford team stacked a perovskite solar cell with an efficiency of a 12.7 percent on top of a low-quality silicon cell with an efficiency of just 11.4 percent. y combining two cells
with approximately the same efficiency you can get a very large efficiency boost, Bailie said.
The researchers stacked a 12.7 percent efficiency perovskite cell onto a CIGS cell with a 17 percent efficiency.
if not all of the layers in a perovskite cell can be deposited from solution, it might be possible to upgrade conventional solar cells into higher-performing tandems with little increase in cost,
A big unanswered question is the long-term stability of perovskites, Mcgehee added. ilicon is a rock,
But if you expose perovskite to water or light it likely will degrade. We have a ways to go to show that perovskite solar cells are stable enough to last 25 years.
My vision is that some day wel be able to get low-cost tandems that are 25 percent efficient.
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