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Title: Structural Characterization of Vapor-Deposited Glasses of an Organic Hole Transport Material with X-ray Scattering

Journal Article · · Chemistry of Materials
 [1];  [2];  [3];  [2];  [1]
  1. Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
  2. Materials Department and Materials Research Laboratory, University of California Santa Barbara, Santa Barbara, California 93117, United States
  3. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
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Vapor-deposited organic glasses can be produced with enhanced thermal stability and tunable molecular orientation by controlling the substrate temperature during deposition. Recent work has also shown improved charge carrier mobility associated with anisotropic molecular packing in organic electronics. Here grazing-incidence wide-angle X-ray scattering (GIWAXS) is used to characterize the structural anisotropy in glasses of a hole transport material, N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine, commonly referred to as TPD. The TPD glasses were prepared by physical vapor deposition at substrate temperatures between 0.79 Tg and 0.98 Tg, where Tg is the glass transition temperature. A GIWAXS-derived orientation order parameter is used to quantify the anisotropy observed in the scattering patterns of the glasses. The GIWAXS-order parameter exhibits both positive and negative values as a function of substrate temperature, indicating either face-on or edge-on packing, and correlates well with a spectroscopic ellipsometry-derived order parameter that is sensitive to molecular orientation. We propose molecular packing arrangements based on the combination of the two order parameters and explore the relationship between kinetic stability and glass structure.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-76SF00515; SC0002161; DMR-1121288; DMR-1410438
OSTI ID:
1413156
Alternate ID(s):
OSTI ID: 1261999
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Vol. 27 Journal Issue: 9; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 69 works
Citation information provided by
Web of Science

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Related Subjects

36 MATERIALS SCIENCE
molecules
scattering
deposition
amorphous materials
order