Study of the Hole Transport Processes in Solution-Processed Layers of the Wide Bandgap Semiconductor Copper(I) Thiocyanate (CuSCN)
File(s)
Author(s)
Pattanasattayavong, P
Mottram, AD
Yan, F
Anthopoulos, TD
Type
Journal Article
Abstract
Wide bandgap hole-transporting semiconductor copper(I) thiocyanate (CuSCN) has recently shown promise both as a transparent p-type channel material for thin-film transistors and as a hole-transporting layer in organic light-emitting diodes and organic photovoltaics. Herein, the hole-transport properties of solution-processed CuSCN layers are investigated. Metal–insulator–semiconductor capacitors are employed to determine key material parameters including: dielectric constant [5.1 (±1.0)], flat-band voltage [−0.7 (±0.1) V], and unintentional hole doping concentration [7.2 (±1.4) × 1017 cm−3]. The density of localized hole states in the mobility gap is analyzed using electrical field-effect measurements; the distribution can be approximated invoking an exponential function with a characteristic energy of 42.4 (±0.1) meV. Further investigation using temperature-dependent mobility measurements in the range 78–318 K reveals the existence of three transport regimes. The first two regimes observed at high (303–228 K) and intermediate (228–123 K) temperatures are described with multiple trapping and release and variable range hopping processes, respectively. The third regime observed at low temperatures (123–78 K) exhibits weak temperature dependence and is attributed to a field-assisted hopping process. The transitions between the mechanisms are discussed based on the temperature dependence of the transport energy.
Date Issued
2015-11-18
Date Acceptance
2015-08-30
Citation
Advanced Functional Materials, 2015, 25 (43), pp.6802-6813
ISSN
1616-3028
Publisher
Wiley
Start Page
6802
End Page
6813
Journal / Book Title
Advanced Functional Materials
Volume
25
Issue
43
Copyright Statement
This is the peer reviewed version of the following article: Pattanasattayavong, P., Mottram, A. D., Yan, F. and Anthopoulos, T. D. (2015), Study of the Hole Transport Processes in Solution-Processed Layers of the Wide Bandgap Semiconductor Copper(I) Thiocyanate (CuSCN). Adv. Funct. Mater., 25: 6802–6813, which has been published in final form at https://dx.doi.org/10.1002/adfm.201502953. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
THIN-FILM TRANSISTORS
HYDROGENATED AMORPHOUS-SILICON
SENSITIZED SOLAR-CELL
ROOM-TEMPERATURE
DISORDERED SEMICONDUCTORS
ELECTRONIC TRANSPORT
OXIDE SEMICONDUCTORS
OPTICAL-ABSORPTION
RELAXOR BEHAVIOR
MOBILITY
Publication Status
Published