Research areas

Exciton dynamics in halide perovskites thin films and nanostructures

Our research concerns the development and the optimization of advanced methodologies for synthesis/growth and investigation of nanometric films of CsPbX₃ (X = Cl, Br, I, and their alloys). Most of our samples are deposited by sputtering on different kind of substrates to realize nanometric thick films with high uniformity at the macroscale. Given the high efficiency radiative recombination rate of this class of materials photoluminescence spectroscopy is the most effective tool to investigate the free carriers and excitons recombination. We explore both the linear and non linear regime by means of CW and picosecond pulsed lasers. Several aspects have been investigated as the exciton thermalization, the exciton formation and the radiative and non radiative recombination.

Shallow defects in semiconductors

The investigation of shallow defects is of relevance for material optimization in view of device realization. Our research develops along two lines:

Optical and electrical characterization of shallow defects in halide perovskites films and bulk samples. Thermally stimulated current (TSC) spectroscopy experiments are conducted in collaboration with INFN-Firenze.
Defects passivation by hydrogen irradiation. Hydrogen has been demonstrated to be highly effective in passivating shallow defects. Halide perovskites have a large amount of defects, even though they are known as material defects tolerant. Our research focuses on the role of hydrogen treatment on the optical and structural properties in thin films of CsPbX₃ (X = Cl, Br, I). This work is in collaboration with Sapienza University of Rome and University of Trento.

Metasurfaces with halide perovskites

Very recently halide perovskite metasurfaces are highly investigated for applications to nanophotonics and metaoptics. In particular, our interest concerns the possibility of enhancing the photoluminescence by means of nano/micro resonators realized on semiconductor templates. Two collaborations are in place:

University of Brescia for developing microresonators, which may allow to engineer the PL emission (intensity, spatial pattern, etc.) and can be used for photocatalysis.
CNR-Polytechnic University of Milan for embedding nanocrystals in different kind of silicon templates for efficient nano/micro emitters realization. This collaboration is within the EU project NARCISO.

Recent publications list

Naomi Falsini, Nicola Calisi, Giammarco Roini, Andrea Ristori, Francesco Biccari, Paolo Scardi, Chiara Barri, Monica Bollani, Stefano Caporali, and Anna Vinattieri: “Large-Area Nanocrystalline Caesium Lead Chloride Thin Films: A Focus on the Exciton Recombination Dynamics” (2021), Nanomaterials, 11, 434.
Borri C., Calisi N., Galvanetto E., Falsini N., Biccari F., Vinattieri A., Cucinotta G., Caporali S.: "First proof-of-principle of inorganic lead halide perovskites deposition by magnetron-sputtering" (2020), Nanomaterials 10,1.
Felici, M., Pettinari, G., Biccari, F., Boschetti, A., Younis, S., Birindelli, S., Gurioli, M., Vinattieri, A., Gerardino, A., Businaro, L., Hopkinson, M., Rubini, S., Capizzi, M., Polimeni, A.: "Broadband enhancement of light-matter interaction in photonic crystal cavities integrating site-controlled quantum dots" (2020) Phys. Rev. B 101, art. no. 205403.
Bruzzi M., Falsini N., Calisi N., Vinattieri A.: "Electrically active defects in polycrystalline and single crystal metal halide perovskite" (2020) Energies 13, 1643.
F. Biccari, N. Falsini, M. Bruzzi, F. Gabelloni, N. Calisi, A. Vinattieri: "Defects in perovskites for solar cells and LEDs (2020) Chapter 3 in "Defects in Functional Materials'' (Eds.: F. C. Ling, S. Zhou, A. Kuznetsov).
Bruzzi, M., Talamonti, C., Calisi, N., Caporali, S., Vinattieri, A. "First proof-of-principle of inorganic perovskites clinical radiotherapy dosimeters" (2019) APL Materials, 7 (5), art. no. 051101.
Bruzzi, M., Gabelloni, F., Calisi, N., Caporali, S., Vinattieri, A. "Defective states in micro-crystalline CsPbBr3 and their role on photoconductivity" (2019) Nanomaterials, 9 (2), art. no. 177.
Gabelloni, F., Biccari, F., Falsini, N., Calisi, N., Caporali, S., Vinattieri, A. "Long-living nonlinear behavior in CsPbBr3 carrier recombination dynamics" (2019) Nanophotonics 8, 1447.
Ballabio, Andrea; Bietti, Sergio; Scaccabarozzi, Andrea; Esposito, Luca; Vichi, Stefano; Fedorov, Alexey; Vinattieri, Anna; Mannucci, Cosimo; Biccari, Francesco; Nemcsis, Akos; Toth, Lajos; Miglio, Leo; Gurioli, Massimo; Isella, Giovanni; Sanguinetti, Stefano: "GaAs epilayers grown on patterned (001) silicon substrates via suspended Ge layers" (2019) Scientific Reports 9, 17529.
Biccari, F., Boschetti, A., Pettinari, G., La China, F., Gurioli, M., Intonti, F., Vinattieri, A., Sharma, M., Capizzi, M., Gerardino, A., Businaro, L., Hopkinson, M., Polimeni, A., Felici, M. "Site-Controlled Single-Photon Emitters Fabricated by Near-Field Illumination" (2018) Advanced Materials, 30 (21), art. no. 1705450.
Biccari, F., Gabelloni, F., Burzi, E., Gurioli, M., Pescetelli, S., Agresti, A., Del Rio Castillo, A.E., Ansaldo, A., Kymakis, E., Bonaccorso, F., Di Carlo, A., Vinattieri, A. "Graphene-Based Electron Transport Layers in Perovskite Solar Cells: A Step-Up for an Efficient Carrier Collection" (2017) Advanced Energy Materials, 7 (22), art. no. 1701349.
Biccari, F., Esposito, L., Mannucci, C., Taboada, A.G., Bietti, S., Ballabio, A., Fedorov, A., Isella, G., Von Känel, H., Miglio, L., Sanguinetti, S., Vinattieri, A., Gurioli, M., "Site-controlled natural GaAs(111) quantum dots fabricated on vertical GaAs/Ge microcrystals on deeply patterned Si(001) substrates" (2017) Nanoscience and Nanotechnology Letters, 9 (7), pp. 1108-1113.
Pettinari, G., Gerardino, A., Businaro, L., Polimeni, A., Capizzi, M., Hopkinson, M., Rubini, S., Biccari, F., Intonti, F., Vinattieri, A., Gurioli, M., Felici, M., "A lithographic approach for quantum dot-photonic crystal nanocavity coupling in dilute nitrides" (2017) Microelectronic Engineering, 174, pp. 16-19.
Biccari, F., Gabelloni, F., Francioni, C., La China, F., Caselli, N., Intonti, F., Gurioli, M., Lee, J., Leblebici, S., Weber-Bargioni, A., Vinattieri, A., "Superlinear emission in bare perovskite: Amplified spontaneous emission in disordered film versus single crystal lasing" (2017) Materials Today: Proceedings, 4, pp. S12-S18.
Latini, V., Tisbi, E., Placidi, E., Patella, F., Biccari, F., Gurioli, M., Vinattieri, A., Arciprete, F., "Tuning the growth for a selective nucleation of chains of Quantum Dots behaving as single photon emitters" (2017) Journal of Crystal Growth, 457, pp. 177-183.
Gabelloni, F., Biccari, F., Andreotti, G., Balestri, D., Checcucci, S., Milanesi, A., Calisi, N., Caporali, S., Vinattieri, A., "Recombination dynamics in CsPbBr3 nanocrystals: Role of surface states" (2017) Optical Materials Express, 7 (12), pp. 4367-4373.
Brazzini, T., Sun, H., Sarti, F., Pomeroy, J.W., Hodges, C., Gurioli, M., Vinattieri, A., Uren, M.J., Kuball, M., "Mechanism of hot electron electroluminescence in GaN-based transistors" (2016) Journal of Physics D: Applied Physics, 49 (43), art. no. 435101.
Dotti, N., Sarti, F., Bietti, S., Azarov, A., Kuznetsov, A., Biccari, F., Vinattieri, A., Sanguinetti, S., Abbarchi, M., Gurioli, M., "Germanium-based quantum emitters towards a time-reordering entanglement scheme with degenerate exciton and biexciton states" (2015) Physical Review B - Condensed Matter and Materials Physics, 91 (20), art. no. 205316.
Meneghini, M., Zhu, D., Humphreys, C.J., Berti, M., Gasparotto, A., Cesca, T., Vinattieri, A., Bogani, F., Meneghesso, G., Zanoni, E., "Impact of thermal treatment on the optical performance of InGaN/GaN light emitting diodes" (2015) AIP Advances, 5 (10), art. no. 107121.

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