The concept involves coating a traditional silicon
Post# of 22456
(Total Views: 351)
Posted On: 09/23/2018 4:42:29 PM
Re: Puravida19 #10511
The concept involves coating a traditional silicon cell with a thin layer of transparent perovskite. The silicon and perovskite are tuned to different wavelengths.
When light strikes the cell, the perovskite absorbs as much energy as possible from the blue end of the spectrum. The rest of the light passes through the perovskite onto the silicon, which absorbs energy from the red end of the spectrum.
There are tricks with the overlap of the wavelengths that can make a difference.
Prior to the improvements in the past couple years, QD's were not very efficient and therefore added very little value to the silicone solar cell.
Now that PQD can be well tuned and capable of significantly greater energy absorption , it could take a basic silicon solar cell from 22% efficient up to the upper 20's by adding a step in the existing manufacturing process. This is significant enough to make it viable.
There are other challenges with a pure perovskite cell besides stability that has to be met such as the electrode. It would appear that a commercial standalone perovskite QD solar cell will be many years away at best.
(But maybe some of these other issues are also farther along in improvement/development than what public literature that is published says)
A small degradation of the perovskite layer would not be as bad on tandem cell. For example, a 10% degradation on 25-30% of the energy absorption is better than 10% degradation of absorption of the whole cell. (2-3% versus 10%)
When light strikes the cell, the perovskite absorbs as much energy as possible from the blue end of the spectrum. The rest of the light passes through the perovskite onto the silicon, which absorbs energy from the red end of the spectrum.
There are tricks with the overlap of the wavelengths that can make a difference.
Prior to the improvements in the past couple years, QD's were not very efficient and therefore added very little value to the silicone solar cell.
Now that PQD can be well tuned and capable of significantly greater energy absorption , it could take a basic silicon solar cell from 22% efficient up to the upper 20's by adding a step in the existing manufacturing process. This is significant enough to make it viable.
There are other challenges with a pure perovskite cell besides stability that has to be met such as the electrode. It would appear that a commercial standalone perovskite QD solar cell will be many years away at best.
(But maybe some of these other issues are also farther along in improvement/development than what public literature that is published says)
A small degradation of the perovskite layer would not be as bad on tandem cell. For example, a 10% degradation on 25-30% of the energy absorption is better than 10% degradation of absorption of the whole cell. (2-3% versus 10%)
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