“These results clearly demonstrate that there is a tremendous opportunity for improvement of open-circuit voltages greater than one volt by using smaller QDs in QD solar cells,” said
Despite this remarkable potential for high photocurrent generation, the achievable open-circuit voltage is fundamentally limited due to non-radiative recombination processes in QD solar cells. To overcome this boundary, NRL researchers have reengineered molecular passivation in metal-QD Schottky junction (unidirectional metal to semiconductor junction) solar cells capable of achieving the highest open-circuit voltages ever reported for colloidal QD based solar cells.
Experimental results demonstrate that by improving the passivation of the PbS QD surface through tailored annealing of QD and metal-QD interface using lithium fluoride (LiF) passivation with an optimized LiF thickness. This proves critical for reducing dark current densities by passivating localized traps in the PbS QD surface and metal-QD interface close to the junction, therefore minimizing non-radiative recombination processes in the cells.
Over the last decade,
Most Popular Stories
- Twitter Coming to Phones Without Internet
- Twitter Names Woman to Board
- Obamacare Doing Just Fine, Ky. Governor Says
- Rand Paul Signs up for Obamacare
- Thalia Gets Star on Hollywood Walk of Fame
- How to Arm Yourself Against CryptoLocker Virus
- World Cup Draws: Coaches, Players Offer Insights
- Hispanic Employment Improves in November
- Texas Chiller Moves East
- Warner Bros. Unleashes 'Hobbit: Desolation of Smaug' Merchandise