How Co2 Gas Can Aid Establish High-Performance Solar Cells

Nov 16, 2020 11:28 AM ET
  • Treating silicon with carbon dioxide gas in plasma handling brings simplicity as well as control to an essential action for making solar cells
How Co2 Gas Can Aid Establish High-Performance Solar Cells

A group of scientists from the King Abdullah University of Science and also Technology (KAUST) in Saudi Arabia said they found a procedure for depositing silicon oxide on silicon wafers to produce solar cells. The group used a plasma processing approach in a chamber filled with carbon dioxide gas to achieve their goal.

Silicon is a semiconducting component and also the material of choice for over 90% of solar cells readily available. Nevertheless, when the silicon has been tampered with picked pollutants, the sunlight's power creates electric flow.

According to Ph.D. trainee Areej Alzahrani, technological challenges occur at the revealed surface of the silicon, better called the trouble of 'dangling bonds.' Areej further explains that the reduced accessibility of silicon atoms to bond with each other at the surface area gives area for electrons ejected by sunlight to recombine with the positively billed 'holes' that the departing electrons leave behind.

Nevertheless, the chemical procedure called 'passivation,' where a layer of silicon oxide generated at the surface area regions creates the electric call, consequently fixing the problem.

There are numerous techniques to attain this, however all of it includes its restrictions. The team also presented an additional and also pricey construction action. "The issues with existing methods challenged us to locate an extra easy and also functional procedure," claims Alzahrani.

The remedy includes revealing the silicon to carbon dioxide in plasma-- a reduced temperature ionized gas. The process permits the controlled deposition of silicon oxide, followed by the overlaying of another silicon layer, as required for constructing a solar cell. Achieving both these steps in the exact same chamber uses a significant reduction in production expenses. "This uncomplicated as well as basic procedure could be of excellent usage to the solar cell industry," Alzahrani concludes.

The group was shocked by the control supplied by the new method over the deposition of an ultrathin silicon oxide layer with the required microstructure.

The process likewise creates oxide films that are more stable at high temperatures. Tests likewise exposed that the process likewise permits high voltages and reduced electric resistance, ideal for effective performance.

The group has plans to work on the business stability of the procedure. "The primary step will certainly be to incorporate this procedure into a full as well as working solar cell, while also exploring boosted light-capturing layouts," stated the research group leader, Stefaan De Wolf.

At The Same Time, HighLine Technology GmbH, a spin-off of Fraunhofer Institute for Solar Energy System ISE, claimed that it had created a brand-new giving technology, improving the electricity return of silicon solar cells. The business likewise has strategies to market this technology.

In a similar way, a research study group from the South China University of Technology has declared to have created a brand-new method of generating natural solar cells, which eliminate the requirement for possibly toxic products while maintaining high conversion effectiveness.