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PRINCIPAL PUBLICATION AND AUTHORS
Ultrasensitive 3D Aerosol-Jet-Printed Perovskite X-ray Photodetector, A. Glushkova (a,c), P. Andričević (a), R. Smajda (b), B. Náfrádi (a), M. Kollár (a), V. Djokić (a), A. Arakcheeva (a), L. Forró (a), R. Pugin (b), E. Horváth (a,b), ACS Nano 15, 4077-4084 (2021); https:/doi.org/10.1021/acsnano.0c07993 (a) Laboratory of Physics of Complex Matter (LPMC), Ecole Polytechnique Fédérale de Lausanne, Lausanne (Switzerland) (b) Centre Suisse d Electronique et de Microtechnique (CSEM SA), Neuchatel (Switzerland) (c) Current address: A. Ciers, Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Göteborg (Sweden)
REFERENCES
[1] K. Mantulnikovs et al., ACS Photonics 5(4), 1476-1485 (2018). [2] A. Glushkova et al., Solar Rrl 3(7), 1900044 (2019). [3] A. Glushkova et al., CrystEngComm 20(25), 3543-3549 (2018). [4] A. Arakcheeva et al., Acta Cryst. B 75(3) 361-370 (2019).
Aerosol jet printing (AJP) enables the creation of high aspect-ratio crystalline 3D-structures. Devices based on aerosol-jet-printed MAPbI3 are excellent candidates for X-ray detection, as MAPbI3 demonstrates strong X-ray-stopping power. The AJP technique also opens the way for the creation of heterostructures of MAPbI3 with various materials. An X-ray detector unit based on MAPbI3 on graphene was made, as shown in Figure 123. It was observed that these heterostructures are very promising photoconductors, and the X-ray
detector unit demonstrated record sensitivity values of 2.2 x 108 µCGy-1cm-2. Therefore, such heterostructure- based X-ray detectors could allow for significant lowering of the radiation doses required for X-ray imaging, resulting in safer and more affordable CT imaging systems. With the AJP technique, along with better understanding of the crystallisation processes of complex materials, a new playground for material engineering is opening and new intriguing systems can be created in the future.
Fig. 122: XRD profiles of MAPbI3 and intermediate phases. a-c) Calculated XRD profiles of MAPbI3, (MA)(DMF)PbI3 and (MA)2(DMF)2Pb3I8 intermediate phases. d) XRD profile of (MA)(DMF)PbI3 calculated with the preferable grain orientation normal to the (011) planes. Reproduced from principal publication.
Fig. 123: a) 1 cm2 sensing chip with 3D-printed MAPbI3 walls. b-c) False-coloured SEM images of the 3D-printed MAPbI3 wall on the gold electrodes (graphene in blue, MAPbI3 in purple and metal electrodes in yellow). d) Photograph of the fully integrated X-ray detector unit. Reproduced from principal publication.
