Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.156
Publication date: 7th February 2022
In the past decade, metal halide perovskite (MHP)-based solar cells marked a breakthrough in photovoltaic technologies and reach power conversion efficiencies exceeding 25%. While MHPs exhibit a remarkable defect tolerance, film degradation will eventually deteriorate the optoelectronic properties and hence device performance. A key strategy to substantially enhance the stability is to tailor the interfaces in the device.1
Here, I will discuss the impact of interface formation on device performance also considering the effect of chemical reactions on interface energetics and durability,2 particularly for our recent research activities on oxide buffer- and transport layers.3 In particular, I will describe our use of surface-sensitive photoemission spectroscopy (PES) as a primary tool to provide guidelines for controlling the chemistry and optimize the electronic properties of MHP interfaces. In combination with further advanced characterization techniques, such as Kelvin probe force microscopy (KPFM) to determine surface photovoltage of the investigated layer stacks or quantitative photoluminescence imaging for the analysis of bulk optical properties, we specifically use PES methods to put the role of charge selective contacts in the focus of our research.4
P.S. thanks the French Agence Nationale de la Recherche for funding under the contract number ANR-17-MPGA-0012 in the French-German Make Our Planet Great Again program.
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