New Technology to Make More Efficient and Cheaper Solar Cells
Solar energy is the cheapest and most abundant source of energy on the planet. It it totally free, and is powerful enough and plentiful enough to meet the requirements of the entire world if we use only 0.1% of the energy that reaches us.
Until now solar energy was actually not cost effective enough to be used on a large scale. For example if you installed solar panels to power your home, it would take 20 yrs before it would break even on cost. This was a totally unacceptable time-line for most investors who stayed away.
Over the past few years however solar cell technology has been seeing a lot of advancements which are not only making them more efficient, but cheaper as well.
What are the new technologies?
The new technology that all solar enthusiasts are pinning their hopes on is the thin film solar cells. This thin film technology is radically different from the existing one, and is capable of making the solar cells as much as 65% more efficient. This is a tremendous advantage considering that even nuclear power stations are only 35% efficient, meaning that 65% of the energy is lost in the form of heat.
There have been a few problems though which have prevented this from happening. One is that the cost of making the panels was always too high. Although alternative raw materials that were much cheaper were starting to be used, it was the actual manufacturing process that was increasing the cost.
The material used until now was crystalline silicone, and coating the photo-voltaic cells on top took nearly 45 minutes per panel. Now researchers are experimenting with amorphous silicon which dramatically decreases the coating time by a factor of 10. This will result in tremendous cost savings.
Another problem with traditional solar cells is that the tiny micro channels that were used to interconnect the panels were done mechanically with a stylus. Since these micro channels were supposed to be only 10 or 20 nanometers deep, this was a very laborious and time consuming process.
Now researchers at the Purdue University’s center for Laser-based manufacturing, have found a way to use lasers to burn these micro channels. The lasers fire for only a few picoseconds which are one quadrillionth of a second, making sure that the silicon layers do not overheat, damaging them. They have also been found to make much cleaner and straighter micro channels than the styluses.
When will it hit the market?
Both these technologies are still under development, but initial studies have shows positive results. Already the Purdue team has received funding in the form of a three year grant of $425,000 from the National Science Foundation. The plan as of now is that there will be a solid scientific basis for these technologies within the next three years.
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