Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.267
Publication date: 7th February 2022
Perovskite photovoltaics based on metal halide perovskites is a most promising photovoltaic
technology, but further advance demands improved device stability. Here we show the importance of
perovskite composition engineering by demonstrating long-term stable perovskite solar cells. A high-
throughput robotic approach is used to screen 160 mixed-cation mixed-halide perovskites based on
several optical characterizations, such as UV-vis absorption and photoluminescence spectra. Such
automated big data approaches allow to uniquely identify the most photo-thermal-stable perovskites
under elevated temperature and 1-Sun illumination. Most interestingly, while several perovskite
compositions are found to be stable against high temperatures of up to 140 C and are capable of
passing the damp/heat test without being packaged, the situation is more complex in working devices,
as a stable device requires both - a stable semiconductor layer and stable interfacesi. A p-type interface
consisting of polymeric multi-layers with variable doping is introduced as a robust anode interfaceii.
By integrating the most stable perovskite into this structure, we achieve stable devices that attain
about 100% of their initial efficiency after > 1000 hrs of continuous mpp operation at low
temperatures of 30-40 degrees Celsius. Increasing the temperature to beyond 65 °C caused interface
corrosion, as clearly seen by the formation of s-shaped jV curves. Meticulous engineering of the
dopand / host interactions allowed to overcome this instability, and most recent devices pass up to
2000 hrs under 1 sun @ 65 C without notable degradationiii. Nevertheless, degradation is still
observable when the operation temperature is further raised towards 85 C and above, which
highlights that the microscopic degradation mechanisms in perovskite devices are still not fully
understood. This work introduces into the fundamentals how to accelerate the screening for stable
perovskites layer and devices for operation at elevated temperatures.
REFERENCES:
i Y. Zhang et al and C. J. Brabec , Nature Communication 2021.
ii Y. Hou et al and C. J. Brabec, Science 2017.
iii Y. Zhang et al and C. J. Brabec, Nature Energy 2021, in print.
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