Journal
CHEMISTRY OF MATERIALS
Volume 34, Issue 20, Pages 9251-9260Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.2c02500
Keywords
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Funding
- Graduate Academy of TU Dresden
- German Federal Ministry of Education and Research (BMBF) [03SF0451]
- German Research Foundation (DFG) [LE 3877/1-1]
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The article introduces a method for synthesizing luminescent In-rich Cu-Zn-In-S NPLs using a one-pot approach, and successfully prepares quaternary NPLs with improved stability and optical properties.
Ternary and quaternary colloidal nanocrystals (NCs) based on I-III-VI group semiconductors are promising low-toxic luminescent materials attracting huge interest as alternatives to cadmium-and leadchalcogenide-based NCs. Despite significant progress in the synthesis of three-dimensionally confined quantum dots based on I-III-VI semiconductors with intensive photoluminescence (PL) in a broad spectral range, all attempts to prepare one-dimensionally confined nanoplatelets (NPLs) or nanosheets have resulted in rather nonemitting two-dimensional (2D) NCs. Since 2D NCs of the II-VI group exhibit unique anisotropic optical properties, exploring synthetic strategies to obtain 2D I-III-VI-based NPLs might also reveal interesting optical and electronic features. In this work, we demonstrate the synthesis of luminescent In-rich Cu-Zn-In-S (CZIS) NPLs using a one-pot approach. The synthesis includes the formation of Cu-In-S NPLs from In2S3 seeds, followed by the incorporation of zinc to form quaternary NPLs with improved stability and optical properties. The synthetic strategy implemented results in the formation of -1 nm thick NPLs with lateral sizes of -30 x 10 nm2 and a tetragonal crystal structure. As-synthesized NPLs are stable at ambient conditions and demonstrate PL in the range of 700-800 nm with a large Stokes shift. An additional shell of ZnS grown on CZIS NPLs resulted in the enhancement of their PL quantum yield reaching 29%.
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