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Enhanced Infrared Photodiodes Based on PbS/PbClx Core/Shell Nanocrystals.
Colbert, Adam E; Placencia, Diogenes; Ratcliff, Erin L; Boercker, Janice E; Lee, Paul; Aifer, Edward H; Tischler, Joseph G.
Afiliação
  • Colbert AE; U.S. Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, District of Columbia 20375, United States.
  • Placencia D; U.S. Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, District of Columbia 20375, United States.
  • Ratcliff EL; Department of Chemical and Environmental Engineering, University of Arizona, 1133 East James E. Rogers Way, Tucson, Arizona 85721, United States.
  • Boercker JE; Department of Materials Science & Engineering, University of Arizona, 1235 East James E. Rogers Way, Tucson, Arizona 85721, United States.
  • Lee P; Chemistry and Biochemistry Department, University of Arizona, 1306 East University Boulevard, Tucson, Arizona 85721, United States.
  • Aifer EH; U.S. Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, District of Columbia 20375, United States.
  • Tischler JG; Chemistry and Biochemistry Department, University of Arizona, 1306 East University Boulevard, Tucson, Arizona 85721, United States.
ACS Appl Mater Interfaces ; 13(49): 58916-58926, 2021 Dec 15.
Article em En | MEDLINE | ID: mdl-34870961
ABSTRACT
Improved passivation strategies to address the more complex surface structure of large-diameter nanocrystals are critical to the advancement of infrared photodetectors based on colloidal PbS. In this contribution, the performance of short-wave infrared (SWIR) photodiodes fabricated with PbS/PbClx (core/shell) nanocrystals vs their PbS-only (core) counterparts are directly compared. Devices using PbS cores suffer from shunting and inefficient charge extraction, while core/shell-based devices exhibit greater external quantum efficiencies and lower dark current densities. To elucidate the implications of the shell chemistry on device performance, thickness-dependent energy level offsets and interfacial chemistry of nanocrystal films with the zinc oxide electron-transport layer are evaluated. The disparate device performance between the two synthetic methods is attributed to unfavorable interface dipole formation and surface defect states, associated with inadequate removal of native organic ligands in core-only films. The core/shell system offers a promising route to manage the additional nonpolar (100) surface facets of larger nanocrystals that conventional halide ligand treatments fail to sufficiently passivate.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2021 Tipo de documento: Article