Abstract
Researchers at the University of Central Florida have
developed a way to increase the broadband optical absorption of thin-film solar
cells regardless of their thickness or intrinsic absorption. Thin-film
technologies (less than 10 um) reduce the material cost of solar cells and
provide added flexibility. However, their reduced light absorption capacity results
in lower cell efficiency.
To resolve this issue, the UCF researchers designed a layered
solar-energy apparatus that uniquely combines the effects of coherent perfect
absorption (CPA) and omniresonance optical phenomena. Thus, the invention improves
the power conversion efficiency of solar cells independent of the materials
used. Experimental results indicate that the apparatus achieved an increased
external quantum efficiency (EQE) of 90 percent of the photocurrent generated
in the 80 nm near-infrared (NIR) region from 660-740 nm, as compared to a bare
solar cell.
Technical Details
The invention design consists of a visibly transparent planar structure that uses a CPA scheme to boost the
absorption of a multilayer thin-film configuration. The configuration requires
no surface patterning to overcome the intrinsic absorption limitation of the
absorbing material. Besides planar structures, the device design
strategy can also apply to on-chip implementations for efficient on-chip
optical detection, strong-coupling with resonant materials, and the ultra-sensitive
detection of pathogens.
Partnering Opportunity
The research team is looking for partners to develop the
technology further for commercialization.
Stage of Development
Prototype available.
Benefit
Increases the competitiveness of thin-film technologiesCan be used with any other form of absorbing photonic structure, such as organic photovoltaics, two-dimensional materials, and perovskitesIntroduces a generic approach for wavelength-selective thin-film PV for visibly transparent applicationsMarket Application
Solar energy capturePhotodetectorsWhite-light micro-lasersBroadband resonantly enhanced nonlinear optical limiters
Brochure