Film Formation and Phase Evolution during Co-evaporation of Efficient Perovskite Absorbers analyzed with in situ XRD
Karl Heinze a, Thomas Burwig a, Jaykumar Vaghani a, Paul Pistor a
a Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Poster, Paul Pistor, 114
Publication date: 25th November 2019

Although highly efficient perovskite solar cells can be fabricated using dry, vacuum-based co-evaporation the film formation mechanisms of this fabrication route are still largely underexplored, as most research groups focus on cheap and fast, but industrially unattractive wet-chemical processes. At MLU, we develop dynamic co-evaporation processes for mixed halide perovskites and try to find new material combination with better performance and higher stability. In this contribution, we investigate the film formation during the growth of hybrid lead halide perovskites by co-evaporation with the aid of in situ XRD diagnostics. The detailed analysis of phase evolution, nucleation/reaction/diffusion kinetics and degradation modes allows to pinpoint structure-property relationships between the involved crystalline phases and the device photophysics. We are able to resolve secondary phases such as PbI2 already during growth and our time-resolved measurements allows us to report on the kinetics of film formation and thermal degradation. Ultimately, we report on our progress in fabricating efficient devices in a regular n-i-p structure using a ITO/SnO2/Perovskite/PTAA/Au device configuration.

 

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