MXenes and other two-dimensional materials for perovskite photovoltaics
Aldo Di Carlo a
a ISM-CNR and CHOSE - Centre for Hybrid and Organic Solar Energy, University of Rome ‘‘Tor Vergata’’, IT, Via Cracovia, 50, Roma, Italy
nanoGe Fall Meeting
Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
#2DNanoMat - 2D Nanomaterials for Energy and Environmental Applications
Barcelona, Spain, 2022 October 24th - 28th
Invited Speaker, Aldo Di Carlo, presentation 255
Publication date: 11th July 2022

The large library of two-dimensional materials can be exploited to master interface properties of perovskite solar cells. Here, I will present the results of the use of 2D materials in perovskite cells, modules and panels. In particular I will focus on a new class of 2D, namely Titanium Carbide MXenes (such as Ti3C2). Beside exceptional chemical and mechanical properties, MXenes offer a wide tunabilty of work function (WF) by varying their surface termination. WF can ranges from ≈2 eV (for OH-termination) to ≈6 eV (for O-termination). In particular, by producing well exfoliated Ti3C2Tx MXenes with a relatively low WF (~3.7eV) we demonstrate the capability to tune both perovskite absorber and electron transporting layer (ETL) WFs.[1] This strategy has been applied to nip [1] and pin [2] cells structure and exploited on large area modules [3]. We show that MXene interface engineering used on the n side of pin cell (NiO/perovskite/C60/BCP/Cu) permitx to increase enormously the stability of the cell with a T90 exceeding the 2000 h under continuous light soaking at Maximum Power Point (in ambient conditions) and T80>1000h for thermal stress (85 °C). [4]

The use of a combination of 2D materials to improve performance and stability of perovskite technology has been extended to panels (9 panels of 0.5 sqm each) that have been tested for more than a year in a Solar Farm in Crete.[5] The results of this outodoor test in a real environment will be presented and performance and stability will be discussed.

I gratefully acknowledges the support of European Union’s Horizon 2020 research and innovation programme under grant agreement number 881603—GrapheneCore3

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