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Title: Molecular structure of vapor-deposited amorphous selenium

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4962315· OSTI ID:1843730
 [1]; ORCiD logo [2];  [3];  [4];  [4];  [1]
  1. Stony Brook Univ., NY (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. National Univ. of Singapore (Singapore)
  4. QuantumWise A/S, Copenhagen (Denmark)

The structure of amorphous selenium is clouded with much uncertainty and contradictory results regarding the dominance of polymeric chains versus monomer rings. The analysis of the diffraction radial distribution functions are inconclusive because of the similarities between the crystalline allotropes of selenium in terms of the coordination number, bond length, bond angle, and dihedral angle. Here, we took a much different approach and probed the molecular symmetry of the thermodynamically unstable amorphous state via analysis of structural phase transformations. We verified the structure of the converted metastable and stable crystalline structures using scanning transmission electron microscopy. In addition, given that no experimental technique can tell us the exact three-dimensional atomic arrangements in glassy semiconductors, we performed molecular-dynamic simulations using a well-established empirical three-body interatomic potential. In this work, we developed a true vapor-deposited process for the deposition of selenium molecules onto a substrate using empirical molecular vapor compositions and densities. We prepared both vapor-deposited and melt-quenched samples and showed that the simulated radial distribution functions match very well to experiment. The combination of our experimental and molecular-dynamic analyses shows that the structures of vapor- and melt-quenched glassy/amorphous selenium are quite different, based primarily on rings and chains, respectively, reflecting the predominant structure of the parent phase in its thermodynamic equilibrium.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE
Grant/Contract Number:
AC05-00OR22725; 1 R01 CA148053; 1 R01 EB002655; AC02-98CH10886
OSTI ID:
1843730
Alternate ID(s):
OSTI ID: 1420530
Journal Information:
Journal of Applied Physics, Vol. 120, Issue 13; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

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Sonochemical functionalization of the low-dimensional surface oxide of Galinstan for heterostructured optoelectronic applications journal January 2019
Laser-induced crystallization of monoclinic nanowires in glassy selenium films journal February 2020
Amorphous Selenium and Nanostructures book January 2019
Development of CuInSe2 thin films by SELD method for photovoltaic absorber layer application journal January 2020
Hole transport in selenium semiconductors using density functional theory and bulk Monte Carlo journal December 2018
Phase control in selenium electrodeposition with bath temperature and deposition potential journal March 2019
Corrosion Inhibition of AZ31 Mg Alloy by Aqueous Selenite (SeO 3 2− ) journal January 2019
Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements journal January 2018