Low-T processing of metal oxide compact layers and T-controlled XRD optimisation of perovskite precursors
Cecile Charbonneau a, Tom Dunlop a, Rafael Martivalls a, Carys Worsley a, Trystan Watson a, Rodrigo García Rodríguez a, Matthew Davies a
a Faculty of Science and Engineering, Swansea University, GB, Swansea SA2 8PP, Reino Unido, Swansea, United Kingdom
Proceedings of SUNRISE September Symposium 2021 ‘Powering Green Recovery’ (SUNRISEIII)
Online, Spain, 2021 September 20th - 22nd
Organizers: Hari Upadhyaya, Adrian Walters, James Durrant, Sara Walters and Georgia Bevan
Invited Speaker, Cecile Charbonneau, presentation 046
Publication date: 14th September 2021

This presentation focuses on advances of the research group in the development of materials and characterisation methods supporting the development of lead-halide perovskite solar cells. First, a new chemical route is presented for the fabrication of NiOx thin films at relatively low-T (270 C). Here, methylethanolamine is used as a complexing agent of Ni(OH)2, enabling the dissolution of this compound in various solvents. The resulting precursors can be used to form thin NiOx films with good light transmission properties and are successfully implemented to the fabrication of inverted perovskite cells with comparable performance to that of cells prepared on standard NiOx films (approx. 10-11 %). Second, the presentation focuses on the application of T-controlled XRD to optimise the crystallization of various perovskite precursors. Finally, broad beam ion milling, a technique traditionally enabling the preparation of flat sample surfaces for EBSD analysis (crystal grain orientation in metals) is demonstrated as a novel approach for the preparation of neat cross-sections of C-based perovskite solar cells over a large range (1-2mm). This is used to better understand the complexity of structural variations across a single cell and potential defects affecting device performance.     

Thank you to all co-authors, who led or contributed to this research. This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) through the SPECIFIC Innovation and Knowledge Centre (EP/N020863/1) and Global Challenges Research Fund.

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