15-18 March 2021
Europe/Berlin timezone

2D layered perovskite micro-crystalline films as efficient X-Ray dosimeters

18 Mar 2021, 10:15


Oral contribution Energy materials: batteries, photovoltaics, etc. Energy materials: batteries, photovoltaics, etc.


Dr Ferdinand Lédée (University of Bologna)


Hybrid halide perovskites are a new class of solution-processed semiconductors that combine low-temperature (<100 °C) synthesis, high charge carrier diffusion length and low defect density. The past few years, hybrid halide perovskites such as $CH_{3}NH_{3}PbI_{3}$ have shown promising results for the detection of high-energy ionizing radiation (X- and Gamma-rays).[1] Their large-scale commercialization is however hindered by their poor stability, owing to the volatility of the small organic cation $CH_{3}NH_{3}^{+}$.

2D layered hybrid halide perovskites $(R-NH_{3})_{2}PbX_{4}$ (R = organic chain, X = $Cl^{-}$, $Br^{-}$, $I^{-}$) have recently shown an increasing interest in the fields of solar cells and LEDs. This sub-class of perovskite crystallizes in a natural, self-assembled quantum well structure and possess several interesting features, among which a much better stability than their 3D counterparts.[2,3] We will present in this work the first solid-state ionizing radiation detector based on a 2D layered hybrid perovskite. This material can be deposited from solution in the form of micro-crystalline thin films that display a single crystalline orientation. We will expose the direct integration of this material onto a pre-patterned flexible substrate and demonstrate the effective detection of X-Rays with sensitivity values as high as 757 uC.Gy-1.cm-2 and a Limit of Detection (LoD) of 8 nGy.s-1, which is among the lowest reported value for solid-state detectors. 2D perovskites offers the prospects of flexible solid-state detectors capable of working at low radiation flux for real-time X-Ray dosimetry.

[1] L. Basiricò, S. P. Senanayak, A. Ciavatti, M. Abdi-Jalebi, B. Fraboni and H. Sirringhaus, Adv. Funct. Mater., 2019, 9.
[2] D. B. Mitzi, Journal of the Chemical Society, Dalton Transactions, 2001, 0, 1–12.
[3] J. V. Passarelli, D. J. Fairfield, N. A. Sather, M. P. Hendricks, H. Sai, C. L. Stern and S. I. Stupp, J. Am. Chem. Soc., 2018, 140, 7313–7323.

Figure caption. (a) Schematic of the device structure. Bottom: graphical representation of the $(R-NH_{3})_{2}PbX_{4}$ crystal structure projected along the direction <010> showing the stacking of the 2D layers. (b) Photograph (left) and microscope image (right) showing the crystal grains morphology close to the pixel area.

Primary author

Dr Ferdinand Lédée (University of Bologna)


Mr Matteo Verdi (University of Bologna) Dr Laura Basiricò (University of Bologna) Dr Ciavatti Andrea (University of Bologna) Prof. Beatrice Fraboni (University of Bologna)

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