Charge traps in organic semiconductors can now be detected in solar cells

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Credit: SWANSEA UNIVERSITY

Organic semiconductors having ” charge traps”, which are small signatures can now be detected using the technology devised by Swansea University. The sensitive method has been published in Nature Communications. The European Regional Development Fund shall be used by the Welsh Government to support his project.

Organic solar cells plead and photodetectors along with their usage can be understood more broadly now with the newfound development. Carbon and Hydrogen are generally found in these Organic semiconductors and these are colorful, flexible, and generally of very little weight and thus portable.

In OLED displays, these are used and therefore can be distinguished and can mimic the rod and cone cells of the eye of a human.

With the advancements, solar energy can be converted to electricity with an efficiency of 18 percent using the solar cells and therefore the fundamental working principle of such must be understood to understand better efficiency.

“For a long time, we guessed that some charges that are generated by the sunlight can be trapped in the semiconductor layer of the solar cell, but we’ve never really been able to prove it. “These traps make solar cells less efficient, photodetectors less sensitive and an OLED TV less bright, so we really need a way to study them and then understand how to avoid them – this is what motivates our work and why these recent findings are so important.”, Said Nasim Zarrabi, a research scholar at Swansea University who has been working on this for long .

The lead researchers said ,”Ordinarily, traps are ‘dead ends’ so to speak; in our study we see them also generating new charges rather than annihilating them completely. “We’d predicted this could maybe happen, but until now did not have the experimental accuracy to detect these charges generated via traps.”

They have been waiting for such a break for long according to the theorist S. Sandberg, who also mentioned ,”What we observed experimentally has been known in silicon and gallium arsenide as intermediate band solar cells, in organic solar cells it has never been shown that traps can generate charges,”

Since the charges are tiny, additional electricity won’t be helpful for more products in this case. However, it is important to be noted that the study of such and further research is beneficial in understanding further improvements in performance and thus such findings must be continued.

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