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Extended Short-Wavelength Infrared Photoluminescence and Photocurrent of Nonstoichiometric Silver Telluride Colloidal Nanocrystals.
Kim, Gahyeon; Choi, Dongsun; Eom, So Young; Song, Haemin; Jeong, Kwang Seob.
Afiliación
  • Kim G; Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
  • Choi D; Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
  • Eom SY; Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
  • Song H; Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
  • Jeong KS; Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
Nano Lett ; 21(19): 8073-8079, 2021 Oct 13.
Article en En | MEDLINE | ID: mdl-34524828
Demands on nontoxic nanomaterials in the short-wavelength infrared (SWIR) have rapidly grown over the past decade. Here, we present the nonstoichiometric silver chalcogenide nanocrystals of AgxTe (x > 2) and Ag2Te/Ag2S CQDs with a tunable bandgap across the SWIR region. When the atomic percent of the metal and chalcogenide elements are varied, the emission frequency of the excitonic peak is successfully extended to 2.7 µm. Surprisingly, the AgxTe CQD film responds to the SWIR light with a responsivity of 2.1 A/W at 78 K. Also, the Ag2S shell growth over the Ag2Te core enhances not only the emission intensity but also the structural rigidity, preventing crystal morphology deformation under the electron beam. The origin of the enhancement in the emission intensity and air stability of AgxTe and Ag2Te/Ag2S CQDs is carefully investigated by X-ray photoelectron spectroscopy (XPS). The optical properties and infrared photocurrent of AgxTe CQDs will provide new opportunities for solution-based SWIR applications.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2021 Tipo del documento: Article Pais de publicación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2021 Tipo del documento: Article Pais de publicación: Estados Unidos