Enhanced Infrared Photodiodes Based on PbS/PbClxCore/Shell Nanocrystals

Adam E. Colbert, Diogenes Placencia, Erin L. Ratcliff, Janice E. Boercker, Paul Lee, Edward H. Aifer, Joseph G. Tischler

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)58916-58926
Number of pages11
JournalACS Applied Materials and Interfaces
Volume13
Issue number49
DOIs
StatePublished - Dec 15 2021

Keywords

  • infrared photodiodes
  • interfaces
  • nanocrystals
  • optoelectronic devices
  • photoelectron spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)

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