Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.251
Publication date: 22nd December 2022
The direct wet chemical synthesis of lead chalcogenide based 2D semiconductors, so-called nanoplatelets (NPLs), yields photoluminescent materials with strong excitonic effects at room temperature. [1,2,3] Here, we report a direct wet chemical approach [1] followed by a subsequent surface passivation step [2] toward bright colloidal PbSe NPLs with high emission efficiency. The NPLs exhibit excitonic features in the range of 800 - 1000 nm and photoluminescence in the range of 860 - 1510 nm, with the respective positions being seamlessly tunable by adjusting the NPLs lateral size via the reaction parameters. [2] Upon surface passivation with metal halides the NPLs exhibit a photoluminescence quantum yield of up to 60 % depending on the PL position as well as a reduced full width at half maximum of the photoluminescence by 10 %. [1] The enhanced optical properties are ascribed to a combined passivating role of both X- and Z-type binding halides and metal halides, providing an additional tool for tailoring the optical properties, colloidal stability and photostability of the PbSe NPLs. [1]
Efficient and narrow photoluminescence in the technologically desirable near-infrared and shortwave-infrared regions are vital requirements for single photon emission and applicability in quantum optics, rendering colloidal PbSe NPLs promising candidates compatible with integrated and fiber-based technology.
The authors thank the Laboratory for Nano and Quantum Engineering (LNQE) in Hannover for access to the TEM. We thank N. C. Bigall for access to the UV-Vis-NIR photoluminescence spectrometer, the XPS (major equipment DFG project number 448713396) and D. Dorfs for access to the UV-Vis-NIR absorption spectrometer. We are grateful to A. Feldhoff for providing the XRD facilities, and to J. Caro for access to the ATR-FTIR spectrometer.
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