Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Over the last years we have witnessed a tremendous interest into hybrid organic-inorganic perovskite solar cells (PSCs) research. However, a number of questions regarding fundamental properties and working principles of the devices still remain unanswered. The chemistry at the interfaces has been identified as critically affecting the fundamental optoelectronic properties of the perovskite-based absorber as well as of the working principles of the corresponding solar cells.
We employed advanced and complementary characterisation techniques, namely multidimensional absolute photoluminescence (PL) and X-Ray Photoelectron Spectroscopy (XPS), to correlate optoelectronic and chemical properties. On the one side, through hyperspectral imaging (HI) and time-resolved fluorescence imaging (TR-FLIM) we investigated intrinsic material and carrier transport properties with quantitative indicators such as Quasi Fermi Level Splitting (QFLS), carrier mobility and recombination rates. On the other side, complementary XPS analyses were implemented on the same batch of samples to precisely determine the chemistry evolution at the surface but also in-depth, by means of Ar+ profiling, to determine if the optoelectronic properties modification could be attributed to changes in the chemical states of the perovskite layer.
Here, we have investigated the behaviour of a triple cation mixed halide perovskite thin film deposited on a glass/FTO/c-TiO2/m-TiO2 stack. A series of mixed halide multi-cations perovskite thin films were light soaked for 10 minutes, 1 hour, 5 hours and 15 hours in air. After 15 hours of light soaking in standard conditions, important surface evolutions were observed, especially for Pb and N environment, with the appearance of new chemical environments. Profiles of the perovskite layers were performed and compared to understand the evolution of elements repartition and will be presented here. Interestingly, these variations in chemical compositions correspond to significant changes in the transport properties of the material. Through time-resolved PL analysis we observed a significant increase in terms of decay time in the aged samples, while spectrally resolved analysis showed a red shift in the photoluminescence (PL) peak and an increase of the absolute PL intensity.
The use of a wide range of cutting-edge characterization techniques represents a unique cross-disciplinary approach to the study of this complex class of materials, which allowed us to directly correlate surface elemental composition studies to spectral resolved photoluminescence measurements.
This project has been supported by the French Government in the frame of the program of investment for the future (Program d’Investissement d’Avenir - ANRIEED-002-01). S.C. thanks funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowoska-Curie Grant Agreement N 845612. P.S. thanks funding by the Make Our Planet Great Again grant ANR-17-MPGA-0012.
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