Morphological Control of 2D Hybrid Organic-Inorganic Semiconductor AgSePh

Watcharaphol Paritmongkol, Woo Seok Lee, Wenbi Shcherbakov-Wu, Seung Kyun Ha, Tomoaki Sakurada, Soong Ju Oh, William A. Tisdale

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Silver phenylselenolate (AgSePh) is a hybrid organic-inorganic two-dimensional (2D) semiconductor exhibiting narrow blue emission, in-plane anisotropy, and large exciton binding energy. Here, we show that the addition of carefully chosen solvent vapors during the chemical transformation of metallic silver to AgSePh allows for control over the size and orientation of AgSePh crystals. By testing 28 solvent vapors (with different polarities, boiling points, and functional groups), we controlled the resulting crystal size from <200 nm up to a few μm. Furthermore, choice of solvent vapor can substantially improve the orientational homogeneity of 2D crystals with respect to the substrate. In particular, solvents known to form complexes with silver ions, such as dimethyl sulfoxide (DMSO), led to the largest lateral crystal dimensions and parallel crystal orientation. We perform systematic optical and electrical characterizations on DMSO vapor-grown AgSePh films demonstrating improved crystalline quality, lower defect densities, higher photoconductivity, lower dark conductivity, suppression of ionic migration, and reduced midgap photoluminescence at low temperature. Overall, this work provides a strategy for realizing AgSePh films with improved optical properties and reveals the roles of solvent vapors on the chemical transformation of metallic silver.

Original languageEnglish
Pages (from-to)2054-2065
Number of pages12
JournalACS nano
Volume16
Issue number2
DOIs
Publication statusPublished - 2022 Feb 22

Keywords

  • defects
  • hybrid semiconductors
  • metal organic chalcogenolates
  • optical properties
  • photodetectors
  • synthesis
  • two-dimensional

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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