Periodic Reporting for period 1 - APPEL (Approaching efficiency limits of perovskite solar cells by overcoming non-radiative recombination losses)
Reporting period: 2016-11-01 to 2018-10-31
Crucially, we applied several surface passivation techniques and studied their effect on recombination and full devices. We formulated a completely new approach that will be protect by a patent application. Other aspects of passivation have been explored as for example the role quaternary ammonium halide salts for bromide-containing perovskites and also the use of small alkali metal ions (e.g. Na+, K+) in high performing photovoltaic devices.
Finally, we demonstrated the benefits of improved understanding of recombination processes as well as the fine tuning of the surface of the perovskites via passivation, by fabricating photovoltaic devices with power conversion efficiency above 20%. This work has already generated a relatively large number of peer-reviewed publications (6) in high impact journals, which will be followed by more publications that have been submitted (6) or are currently in preparation (7).