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Improving Solar panels efficiency?

Posted by o_lampe 
Improving Solar panels efficiency?
September 16, 2018 10:41AM
A few years back I had the idea to improve solar panels efficiency with nano-lenses.

IMHO most of the photons 'miss' their target in a silicon-wafer and only increase temperature.
If it's possible to focus the photons 'to the right place' in the silicon molecule-grid, we'd see increased efficiency over a wider temp-range.

Thought it was worth mentioning it here, since we have a Nanotec-expert on board...
VDX
Re: Improving Solar panels efficiency?
September 16, 2018 12:23PM
... one relative simple idea is to "grow" micro-pyramides on the panels, what's catching ambient and diffuse light too. One friend of mine did this as project, but the results weren't published eye rolling smiley

A more "nano-tech" concept is a concurrent design with carbon nanotubes, grown perpendicular on a contact array and covered with a thin transparent sheet with another contact field to get the voltage difference.

The carbon nanotubes are extreme efficient photon-absorbers (they are "total black") and can even release more than one electron per photon, if the energy is high enough.

Their "mechanical structure" is a tube and with a potential from tip to bottom (between the two electrodes) they can interact with photons and electrons in some "funny" ways, what's not researched in detph, but could show some more surprises in respect to energy generation or transforming cool smiley


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
VDX
Re: Improving Solar panels efficiency?
September 16, 2018 12:36PM
... to put another idea in the pot - search for the Seebeck-effect (inverse to Peltier-coolers, will generate current with temperature differences).

Seebeck-elements are simply two wires of metals with different "electrical series", e.g. constantan vs. iron (el.series = -35 vs. +19 ... but e.g. bismut vs. silizium will give much more: -72 vs. +440 ... and selen is even +900!), the ends fused together, will generate some current when heating the contact point.

To get more current, more pieces of this two material can be connected alternating and when putting all "even" points together and all "odd" too, then a temperature difference between the "even" and "odd" points will create the more current, the more contact points.

As this "connecting" can be done much easier than making photovoltaics, this coud be a much easier approach for "DIY solar generators" - think about heating with concentrated sun light to +300 degC and cooling in the shadow of the element or with water (if handy around) ...

Edited 1 time(s). Last edit at 09/16/2018 12:38PM by VDX.


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
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