By using a post-deposition in situ passivation strategy, the team at Spain’s Institute of Photonic Sciences has been able to smooth the way toward increased solar energy collection, as Interesting Engineering reported.
“Imagine a bumpy road that slows down cars. Surface passivation is like repaving the road, making it smoother so cars can move without getting stuck,” said Dr. Jae Taek Oh, first author of the study.It’s all about removing surface defects that inhibit power conversion efficiency in order to facilitate the transport of electrical charge carriers across the ultra-thin solar film.
The nanocrystal ink is made from abundant and environmentally friendly colloidal silver bismuth sulfide, as IE explained. This has a high light absorption coefficient — making it ideal for optoelectronic applications — and can be fully dissolved in water.
“We show that, upon improved colloidal dispersibility and surface passivation, [these nanocrystals] yield thin films free from morphological defects with low trap-state density and balanced charge carrier mobilities,” per the original study.
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