Impact of Alkaline Earth Metal Doping on the Stability of Perovskite Solar Cells
Nga Phung a, Hans Köbler a, Diego Di Girolamo b, Thi Tuyen Ngo c, Gabrielle Sousa e Silva a, Ivan Mora-Seró c, Bernd Rech a, Antonio Abate a
a Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Germany, Berlin, Germany
b Department of Chemistry, “La Sapienza” University of Rome, Piazzale Aldo Moro, 5, Roma, Italy
c Universitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting19 (NFM19)
#PERInt19. Interplay of composition, structure and electronic properties in halide-perovskites
Berlin, Germany, 2019 November 3rd - 8th
Organizer: Pablo P. Boix
Oral, Nga Phung, presentation 036
DOI: https://doi.org/10.29363/nanoge.nfm.2019.036
Publication date: 18th July 2019

Halide perovskite solar cells (PSCs) have progressed rapidly to reach an efficiency of more than 24% in laboratory scale to date. However, the long-term stability of PSCs is the main roadblock on the path to industrialization. In this work, we present stability studies on perovskite solar cells utilizing interfacial alkaline earth metal doping.

We are employing a high throughput aging setup to study the long-term stability of the devices. The setup is equipped to measure up to 500 cells simultaneously in maximum power point tracking (MPPT) mode. The combination of full control over temperature, atmosphere and load for such a high number of devices is unique so far and enables significant studies providing reliable data.

One strategy to overcome PSC instability is interfacial doping with alkaline earth metals. We previously demonstrated alkaline earth metal ions (i.e. Mg and Sr) as excellent dopants to improve the device’s performance. The dopants reduce the defect concentrations in the perovskite which in turn significantly improves the open circuit voltage. Nonetheless, when the dopants are intermixed in the precursor solution, this leads to a significant change in the perovskite morphology. To preserve the perovskite morphology, we use dopants as an interlayer in a p-i-n device structure.[1] Following the strategy of interlayer-doping, we present highly stable and reproducible CsMAFA perovskite based[2] solar cells.

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