Scientists Develop Methods to Detect Charge Traps in Organic Semiconductors – ScienceDaily

Scientists at Swansea University have developed a very sensitive method to detect the tiny signatures of so-called “charge traps” in organic semiconductors.

Research, published in Nature Communications and supported by the Welsh Government through the European Regional Development Fund, could change views on what limits the performance of organic solar cells, photo detectors and OLEDs.

Organic semiconductors are materials composed primarily of carbon and hydrogen that can be flexible, light, and colorful.

They are the key components in OLED displays, solar cells, and photo detectors that can distinguish different colors and even mimic the rods and cones of the human eye.

The efficiency of organic solar cells to convert sunlight into electricity has recently reached 18%, and the key is to really understand the basics of how they work.

Lead author Nasim Zarrabi, a PhD student at Swansea University, said, “We have long suspected that some charges created by sunlight could get trapped in the solar cell’s semiconductor layer, but we never really got it.” to prove it.

“These traps make solar cells less efficient, photodetectors less sensitive, and an OLED television less bright. So we really need a way to examine them and then understand how to avoid them – that is what motivates our work and why it does it recent findings are so. ” important.”

The head of research, Dr. Ardalan Armin, a Sêr Cymru II Rising Start Fellow, commented, “Usually traps are kind of ‘dead ends’. In our study, we see that they also create new charges instead of completely destroying them.”

“We had predicted that this could possibly happen, but so far we did not have the experimental accuracy to detect these charges generated by traps.”

Dr. Oskar Sandberg, the theorist behind the work, said he had been waiting for such experimental accuracy for several years.

“What we’ve observed experimentally is known as interband solar cells in silicon and gallium arsenide. Traps have never been shown to generate charges in organic solar cells,” he said.

“The extra charges created by the traps are not beneficial for generating a lot of electricity because they are very small.

“However, it is enough to study these effects and possibly find ways to control them to really improve device performance.”

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