2D PbSe Nanoplatelets with Tunable Emission and High Quantum Yield

Lars F. Klepzig^a^,^b, Leon Biesterfeld^a, Michel Romain^a, Anja Schlosser^a, Nadja C. Bigall^a^,^b, Jannika Lauth^a^,^b

^aInstitute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, DE, Callinstraße, 3A, Hannover, Germany

^bCluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany

Materials for Sustainable Development Conference (MATSUS)
Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)

#Sol2D20. Solution-based Two-dimensional Nanomaterials

Online, Spain, 2020 October 20th - 23rd

Organizers: Christian Klinke, Sandrine Ithurria and Celso de Mello Donega

Poster, Lars F. Klepzig, 262
Publication date: 4th October 2020

ePoster:

2D semiconductor nanocrystals are a unique class of nanomaterials providing promising optoelectronic properties. Lead chalcogenides for example are of particular interest for solution processable optoelectronics for applications in the NIR. While extensive work has been published on lead chalcogenide nanocrystals and thicker nanosheets, atomically thin nanoplatelets only recently moved into focus.[1-3]

Lead chalcogenide nanoplatelets combine the inherent advantages of 2D materials, such as monodispersity in thickness or increased exciton binding energies, with a large exciton-Bohr radius or multiple exciton generation.[4] Their bandgap is suitable for application in the first telecom window and can be controlled by the quantum size effect. In contrast to typical 2D materials, the optical properties of lead chalcogenide nanoplatelets can be determined not only by the thickness, but also by the lateral dimensions.[5]

We present lead selenide nanoplatelets with tunable optoelectronic properties obtained by colloidal chemistry methods. The NPLs photoluminescence quantum yield can be increased by ligand treatment above 35 % while the position of the emission can be finely tuned in a large wavelength region (900 nm – 1500 nm).

References:

[1] Schliehe, C; Juarez, B.; Pelletier, M.; Jander, S.; Greshnykh, D.; Nagel, M.; Meyer, A.; Foerster, S.; Kornowski, A.; Klinke, C.; Weller, H. Ultrathin PbS Sheets by Two-Dimensional Oriented Attachment Science 2010, 329, 550-553

[2] Akkerman, Q.; Martín-García, B.; Buha, J.; Almeida, G.; Toso, S.; Marras, S.; Bonaccorso, F.; Petralanda, U.; Infante, I.; Manna, L. Ultrathin Orthorhombic PbS Nanosheets Chem. Mat. 2019, 31, 8145-8153

[3] Lauth, J.; Failla, M.; Klein, E.; Klinke, C.; Kinge, S.; Siebbeles, L. Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons Nanoscale 2019, 11, 21569

[4] Khan, A.; Brescia, R.; Polovitsyn, A.; Angeloni, I.; Martín-García, B.; Moreels, I. Near-Infrared Emitting Colloidal PbS Nanoplatelets: Lateral Size Control and Optical Spectroscopy Chem. Mat. 2017, 29, 2883-2889

[5] Aerts, M.; Bielewicz, T.; Klinke, C.; Grozema, F.; Houtepen, A.; Schins, J.; Siebbeles, L. Highly efficient carrier multiplication in PbS nanosheets Nat. Commun. 2014, 5, 1-5

Acknowledgements:

The authors are grateful for financial support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). Furthermore, the authors would like to acknowledge the Laboratory of Nano and Quantum Engineering (LNQE) at the Leibniz Universität Hannover for support.

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