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Title: Synthesis of Thick HgxCd1–xSe Nanoplatelets by Cation Exchange Catalyzed by Silver Ions, Showing Amplified Spontaneous Emission

Journal Article · · Chemistry of Materials
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [1];  [3];  [2]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [5]; ORCiD logo [1]
  1. Ecole Superieure de Physique et de Chimie Industrielles (ESPCI), ParisTech (France); PSL Research University (France); Sorbonne Univ., Paris (France); Centre National de la Recherche Scientifique (CNRS) (France)
  2. Synchrotron SOLEIL, Saint-Aubin (France)
  3. Sorbonne Univ., Paris (France); Centre National de la Recherche Scientifique (CNRS) (France)
  4. Univ. Paris-Saclay, Palaiseau (France); Centre National de la Recherche Scientifique (CNRS) (France)
  5. Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)

II-VI semiconductor nanoplatelets have emerged as promising candidates for various applications, owing to their tunable optical properties dictated by their thickness and compositions. In the realm of infrared technology, mercury chalcogenides stand out as particularly promising materials for optoelectronic applications. However, the direct synthesis of 2D particles in this category remains challenging, thus prompting the exploration of alternative methods such as cation exchange. Here, we demonstrate that the cation exchange process from cadmium to mercury can be effectively catalyzed by monovalent Ag+ cations. Further, this catalysis facilitates the formation of alloyed HgxCd1-x Se nanoplatelets with tunable optical properties, with the photoluminescence peak ranging from 1.23 eV for the thinnest three-monolayer (ML) nanoplatelets to 0.92 eV for the thickest 7 ML nanoplatelets. The Ag+ ions reduce the activation energy of the cation exchange process by a factor of 2, enabling enhanced penetration of mercury atoms deep into the native CdSe nanoplatelets. Moreover, these nanoplatelets exhibit optical gain in the infrared spectrum, including the 1.3 μm telecommunication band, with a fluence threshold at 80 K of 50 μJ∙cm-2.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2519644
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 10 Vol. 36; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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