Researchers Develop Method to Enhance Efficiency of Perovskite Solar Cells

The method can be applied not only to solar cells but various semiconductor devices

March 13, 2021


Researchers at the Gwangju Institute of Science and Technology, South Korea, have claimed that they have developed a new method to increase perovskite solar cells’ efficiency by utilizing ions.

The researchers said perovskite solar cells are thin, light, and have a high conversion efficiency of over 25%. However, the efficiency decreases because of the defects in the organic-inorganic complex perovskite materials.

In its report, they explained that defects inside perovskite material have a charge that could be divided into positive electric and negative electric charges. Researchers used a passivation method to control this charge using a material with one charge or unshared electron pair. But only one type of charge can be passivated through this method.

The researchers used L-alanine as an additive to perovskite materials to passivate defects and increase grains in perovskite solar cells to overcome the problem. They confirmed that solar cell efficiency increased to 20.3% from 18.3%.

The report confirmed that the improvement in device efficiency was due to inhibition of nonradiative recombination of perovskite materials through photoluminescence spectroscopy – a contactless and non-destructive method of probing the electronic structure of materials – and time-related single-photon calculation techniques.

Kwanghee Lee, the lead researcher, said that the research suggested a new principle that can resolve defects inside materials with a zwitterion molecule. “This is expected to be applicable not only to the solar cell field but also to various semiconductor devices like light-emitting diodes, transistors, optical sensors using mixed organic and inorganic perovskites.”

In October 2020, a research team from the Australian Research Council Center of Excellence in Exciton Science claimed that they had developed a process that can help enhance perovskite cells’ commercial use.

Mercom had earlier reported that a research team from the Iowa State University came up with a technique that made perovskite solar cell material more stable at higher temperatures.

Harsh Shukla is a staff reporter at Mercom India. Previously with Indian Express, he has covered general interest stories. He holds a Masters Degree in Journalism from Symbiosis Institute of Media and Communication, Pune.

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