Publications
2024
34. Putland, B. W. J.; Righetto, M.; Jin, H.; Fischer, M.; Ramadan, A. J.; Zaininger, K.-A.; Herz, L. M.; Sansom, H. C.; Snaith, H. J. Compositional Transformation and Impurity-Mediated Optical Transitions in Co-Evaporated Cu2AgBiI6 Thin Films for Photovoltaic Applications. Advanced Energy Materials, 14, 2303313 2024
2023
33. Righetto, M.; Caicedo-Dávila, S.; Sirtl, M. T.; Lim, V. ; Patel, J. B.; Egger, D. A.; Bein, T.; Herz, L. M.
Alloying Effects on Charge-Carrier Transport in Silver–Bismuth Double Perovskites
J. Phys. Chem. Lett. 2023, 14 (46), 10340–10347
To Alloy or not to Alloy? This is the question? In this work, we demonstrated for the first time the limitation of alloying strategies for polaronic materials. Through optical-pump-THz-probe spectroscopy, we demonstrate that charge-carrier localisation has a profound effect on charge-carrier transport. We show how for silver-bismuth double halide perovskites localised states probe the electronic landscape from a radically different perspective, hopping between sites, and yielding effective trapping at low-energy sites.
32. Righetto, M.; Wang, Y.; Elmestekawy, K. A.; Xia, C. Q.; Johnston, M. B.; Konstantatos, G.; Herz, L. M.
Cation-Disorder Engineering Promotes Efficient Charge-Carrier Transport in AgBiS2 Nanocrystal Films.
Advanced Materials, 35 (48), 2305009 2023
Disorder is generally considered as detrimental for charge-carrier transport, lowering mobilities, and causing fast recombination. However, this work demonstrates that, when properly engineered, cation disorder in the multinary chalcogenide semiconductor AgBiS2considerably enhances charge-carrier transport and reduces localization effects. Cation- disorder engineering is demonstrated as a powerful strategy to tune the optoelectronic properties of new semiconductors for renewable energy applications.
31. Motti, S. G.; Kober-Czerny, M.; Righetto, M.; Holzhey, P.; Smith, J.; Kraus, H.; Snaith, H. J.; Johnston, M. B.; Herz, L. M. Exciton Formation Dynamics and Band-Like Free Charge-Carrier Transport in 2D Metal Halide Perovskite Semiconductors. Advanced Functional Materials, 33 (32), 2300363 2023
30. Lal, S.; Righetto, M.; Ulatowski, A. M.; Motti, S. G.; Sun, Z.; MacManus-Driscoll, J. L.; Hoye, R. L. Z.; Herz, L. M. Bandlike Transport and Charge-Carrier Dynamics in BiOI Films. The Journal of Physical Chemistry Letters, 14 (29), 6620-6629 2023
29. Sebastiá-Luna, P.; Rodkey, N.; Mirza, A. S.; Mertens, S.; Lal, S.; Gaona Carranza, A. M.; Calbo, J.; Righetto, M.; Sessolo, M.; Herz, L. M.; Vandewal, K.; Ortí, E.; Morales-Masis, M.; Bolink, H. J.; Palazon, F. Chalcohalide Antiperovskite Thin Films with Visible Light Absorption and High Charge-Carrier Mobility Processed by Solvent-Free and Low-Temperature Methods. Chemistry of Materials 35 (16), 6482-6490 2023
28. Jia, Z;* Righetto, M.;* Yang, Y.; Xia, C.Q..; Li, Y.;... Herz, L., Lin, Q.; et al. Charge-Carrier Dynamics of Solution-Processed Antimony- and Bismuth-Based Chalcogenide Thin Films ACS Energy Letters, 8, 3, 1485–1492 2023 (* indicates equal contribution)
In this paper, we systematically explore for the first time the charge-carrier transport properties of emerging heavy-pnictogen chalcogenides. Through combined microwave and THz spectroscopy approach, compounded by device fabrication, we determine structure-transport property relations for these materials and establish new principles to tailor the properties of these materials.
2022
27. Ramesh, S.; Giovanni, D., Righetto, M.; Sum, T.C. et al. Tailoring the Energy Manifold of Quasi-Two- Dimensional Perovskites for Efficient Carrier Extraction Advanced Energy Materials 12 2022 21033556
26. Gotfredsen, H; Deng, J.; Van Raden, J.; Righetto, M.; Herz, L.; Anderson, H.; et al. Bending a Photonic Wire into a Ring Nature Chemistry - 14(12) - 2022
25. Huang, Y.-T.; Kavanagh, S.; Righetto, M.; Herz, L.; Hoye, R. L. Z.; et al Strong Absorption and Ultrafast Localisation in NaBiS2 Nanocrystals with Slow Charge-Carrier Recombination Nature Communications 13 2022 (1), 1-13
24. Hoojier, R; ... ; Righetto, M.; Herz, L.; Bein, T.; et al. Silver-Bismuth Based 2D Double Perovskites (4FPEA)4AgBiX8(X = Cl, Br, I): Highly Oriented Thin Films with Large Domain Sizes and Ultrafast Charge-Carrier Localization Advanced Optical Materials 10 2022 (14) 2200354
2021
23. Righetto, M.; Cacialli, F. Charge Transport Layers in Halide Perovskites Photonic Devices, Chapter 05 in "Halide Perovskites for Photonics" AIP Publishing Books 2021
22. Alt, K; Carraro, F; Jap, E; Linares-Moreau, M; Riccò, R; Righetto, M.; et al. Self‐Assembly of Oriented Antibody‐Decorated Metal‐Organic Framework Nanocrystals for Active Targeting Applications Advanced Materials 2106607 2021
21. Guo, K; Righetto, M.; Minotto, A; Cacialli, F. Non-toxic Near-infrared light emitting diodes iScience 24 2021 6
20. Schmitz, F; Horn, J.; Dengo, N.; ... ; Meggiolaro, D.**; Righetto, M.**; Gatti, T.** Large Cation Engineering in Two-Dimensional Silver–Bismuth Bromide Double Perovskites Chemistry of Materials 33 (12) 2021 4688-4700 (** indicates corresponding authorship)
In this paper, we introduce novel 2D lead-free perovskites that feature different large cations. Through combined morphological and optical characterization, backed by DFT, we determine structure-property relations for these materials and establish new principles to tailor the properties of these materials.
19. Privitera, A*; Righetto, M.*; Cacialli, F.; Riede, M. Perspectives of Organic and Perovskite‐Based Spintronics Advanced Optical Materials 9 2021 2100215 (* indicates equal contribution)
18. Righetto, M*.; Giovanni, D.*; Lim, S. S. and Sum, T.C. The photophysics of Ruddlesden-Popper perovskites: A tale of energy, charges, and spins Applied Physics Reviews 8(1) 2021 011318 (* indicates equal contribution)
17. Giovanni, D.*; Righetto, M.*; Sum, T.C. et al. Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping Light: Science and Applications 124, 22314−22320 (* indicates equal contribution)
We report direct imaging of >1 μm exciton diffusion lengths in MAPbBr3 perovskite nanocrystal (PNC) films. Surprisingly, the resulting exciton mobilities in these PNC films can reach 10 ± 2 cm/(V s) , which is counterintuitively several times higher than the carrier mobility in 3D perovskite films. We show that this ultralong exciton diffusion originates from both efficient inter-NC exciton hopping (via Förster energy transfer) and the photon recycling process with a smaller yet significant contribution.
These findings have been featured in a dedicated News & Views
2020
16. Righetto, M.**; Carraro. F.; Ferrante, C. et al. An Unconventional Perspective on the nature of Carbon dots fluorescence Journal of Physical Chemistry C 124, 2020 22314−22320 (** indicates corresponding authorship)
15. Giovanni, D.; Ramesh, S.; Righetto, M.; Sum, T.C. et al. The Physics of Interlayer Exciton Delocalization in Ruddlesden-Popper Lead Halide Perovskites Nano Letters 21 2020 405−413
14. Righetto, M*.; Lim, S. S.*; Giovanni, D.*; Sum, T.C. et al. Hot Carriers perspective on the nature of traps in perovskites Nature Communications 11 2020 2712. (* indicates equal contribution)
In this paper, we demonstrate the role of excess energy in determining trap-mediated recombination in perovskite nanocrystals.
Through pump-push-probe spectroscopy and PLQY excitation spectra, we identify shallow traps as main culprits. Passivation using TOPO is demonstrated as an effective mitigation strategy.
13. Righetto, M.; Meggiolaro, D.; Sum, T.C. et al. Coupling Halide Perovskites with Different Materials: from Doping to Nanocomposites, Beyond Photovoltaics Progress in Materials Science 110 2020 100639
12. Sum, T.C. Righetto, M.; Lim, S.S.; Perovskite Emitters: Quo Vadis? The Journal of Chemical Physics 11 2020 152– Featured Article and Editors Choice for JCP
11. Lim, J. W.; Giovanni, D.; Righetto, M.; Sum, T.C. et al. Hot Carriers in Halide Perovskites: How Hot Truly? The Journal of Physical Chemistry Letters, 7, 2020 2743-2750
2019
10. Giovanni, D.; Lim, M.; Yuan, Z.; Lim, S.S.; Righetto, M.; et al. Ultrafast Long- Range Spin-Funneling In Solution-Processed Ruddlesden–Popper Halide Perovskites Nature Communications 10 2019, 3456
2018
9. Righetto, M.; Privitera, A.; Fortunati, I.; Bozio, R. et al. Engineering Interactions in QDs–PCBM Blends: A Surface Chemistry Approach Nanoscale, 10, 2018,11913.
8. G. Tuci, D. Mosconi, S. Agnoli, M. Righetto, G. Giambastiani et al., Surface Engineering of Chemically Exfoliated MoS2in a “Click”: How to Generate Versatile Multifunctional Transition Metal Dichalcogenides-Based Platforms Chemistry of Materials 30, 2018, 8257-8269
7. Righetto, M.; Collini, E. et al. Deciphering Hot- And Multi-Exciton Dynamics In Core–Shell QDs by 2D Electronic Spectroscopies. Physical Chemistry Chemical Physics, 20, 2018, 18176
2017
6. Righetto, M.; Privitera, A.; Fortunati, I.; Bozio, R.; Ferrante, C. et al. Spectroscopic Insights into Carbon Dot Systems. The Journal of Physical Chemistry Letters, 8, 2017 , 2236-2242.
Here, we demonstrate for the first time that the optical properties of Carbon Dots are determined not by the dots but rather by molecular by-products. These results are backed using fluorescence correlation spectroscopy, PLQY excitation, light-induced and time-resolved EPR.
This manuscript has been selected to represent Carbon in the ACS Periodic Table
5. Privitera, A.; Righetto, M.; I.; Bozio, R.; Franco, L. et al. Hybrid Organic/Inorganic Perovskites-Polymer Nanocomposites: Towards the Enhancement of Structural and Electrical Properties The Journal of Physical Chemistry Letters, 8, 2017, 5981–5986
4. Privitera, A.; Righetto, M.; Bozio, R.; Franco, L. The Central Role of Ligands in Electron Transfer from Perovskite Nanocrystals. MRS Advances, 2, 2017 2327-2335
3. Righetto, M.; Minotto, A.; Bozio, R., Bridging Energetics and Dynamics of Exciton Trapping in Core-Shell Quantum Dots The Journal of Physical Chemistry C 1, 2017, 896-902.
2016 and earlier
2. Privitera, A.; Righetto, M.; Bozio, R.; Ferrante, C. Franco, L. et al., Boosting Carbon Quantum Dots/Fullerene Electron Transfer Via Surface Group Engineering. Physical Chemistry Chemical Physics 18, 2016, 31286-31295.
1. Carraro, F.; Calvillo, L.; Cattelan, M.; Favaro, M.; Righetto, M.; Nappini, S.; Píš, I.; Celorrio, V.; Fermín, D. J.; Martucci, A.; Agnoli, S.; Granozzi, G., Fast One-Pot Synthesis of MoS2/Crumpled Graphene p–n Nanojunctions for Enhanced Photoelectrochemical Hydrogen Production. ACS Applied Materials & Interfaces, 7, 2015, 25685-25692.