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Planar perovskite solar cells with long-term stability using ionic liquid additives

Title data

Bai, Sai ; Da, Peimei ; Li, Cheng ; Wang, Zhiping ; Yuan, Zhongcheng ; Fu, Fan ; Kawecki, Maciej ; Liu, Xianjie ; Sakai, Nobuya ; Wang, Jacob Tse-Wei ; Hüttner, Sven ; Buecheler, Stephan ; Fahlman, Mats ; Gao, Feng ; Snaith, Henry J.:
Planar perovskite solar cells with long-term stability using ionic liquid additives.
In: Nature. Vol. 571 (1 July 2019) Issue 7764 . - pp. 245-250.
ISSN 1476-4687
DOI: https://doi.org/10.1038/s41586-019-1357-2

Abstract in another language

Solar cells based on metal halide perovskites are one of the most promising photovoltaic technologies1–4. Over the past few years, the long-term operational stability of such devices has been greatly improved by tuning the composition of the perovskites5–9, optimizing the interfaces within the device structures10–13, and using new encapsulation techniques14,15. However, further improvements are required in order to deliver a longer-lasting technology. Ion migration in the perovskite active layer—especially under illumination and heat—is arguably the most difficult aspect to mitigate16–18. Here we incorporate ionic liquids into the perovskite film and thence into positive–intrinsic–negative photovoltaic devices, increasing the device efficiency and markedly improving the long-term device stability. Specifically, we observe a degradation in performance of only around five per cent for the most stable encapsulated device under continuous simulated full-spectrum sunlight for more than 1,800 hours at 70 to 75 degrees Celsius, and estimate that the time required for the device to drop to eighty per cent of its peak performance is about 5,200 hours. Our demonstration of long-term operational, stable solar cells under intense conditions is a key step towards a reliable perovskite photovoltaic technology.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy > Junior Professorship Solar Energy - Juniorprof. Dr. Sven Hüttner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 27 Sep 2019 08:49
Last Modified: 27 Sep 2019 08:49
URI: https://eref.uni-bayreuth.de/id/eprint/52483