Files and links (1)
CC BY V4.0, Open Access
Journal article
Unequilibrated Charge Carrier Mobility in Organic Semiconductors Measured Using Injection Metal-Insulator-Semiconductor Charge Extraction by Linearly Increasing Voltage
Advanced photonics research, Vol.5(9), 2300325
2024
Appears in Open Access via Read & Publish Agreements
Abstract
The charge carrier mobility in tris(4-carbazoyl-9-ylphenyl)amine (TCTA), a host and hole transport material typically used in organic light-emitting diodes (OLEDs), is measured using charge carrier electrical injection metal-insulator-semiconductor charge extraction by linearly increasing voltage (i-MIS-CELIV). By employing the injection current i-MIS-CELIV method, charge transport at time scales shorter than the transit times typically observed in standard MIS-CELIV is measured. The i-MIS-CELIV technique enables the experimental measurement of unequilibrated and pretrapped charge carriers. Through a comparison of injection and extraction current transients obtained from i-MIS-CELIV and MIS-CELIV, it is concluded that hole trapping is negligible in evaporated neat films of TCTA within the time-scales relevant to the operational conditions of optoelectronic devices, such as OLEDs. Furthermore, photocarrier generation in conjunction with i-MIS-CELIV (photo-i-MIS-CELIV) to quantify the properties of charge injection from the electrode to the semiconductor of the MIS devices is utilized. Based on the photo-i-MIS-CELIV measurements, it is observed that the contact resistance does not limit the injection current at the TCTA/molybdenum oxide/silver interface. Therefore, when TCTA is employed as the hole transport/electron-blocking layer in OLEDs, it does not significantly reduce the injection current and remains compatible with the high injection current densities required for efficient OLED operation.
We employ injection metal-insulator-semiconductor charge extraction by linearly increasing voltage (i-MIS-CELIV) to measure mobility in tris(4-carbazoyl-9-ylphenyl)amine (TCTA), a material used in organic light-emitting diodes (OLEDs). Negligible hole trapping in the evaporated TCTA films compatibility was observed . Photo-i-MIS-CELIV measurements showed that there was insignificant reduction in injection current at the semiconductor/contact interface.image (c) 2024 WILEY-VCH GmbH
Details
- Title
- Unequilibrated Charge Carrier Mobility in Organic Semiconductors Measured Using Injection Metal-Insulator-Semiconductor Charge Extraction by Linearly Increasing Voltage
- Authors/Creators
- Mile Gao - The University of QueenslandPaul L. Burn - Univ Queensland, Ctr Organ Photon & Elect, Sch Chem & Mol Biosci, Brisbane, Qld 4072, AustraliaGytis Juska - Vilnius UniversityAlmantas Pivrikas - Murdoch University, School of Mathematics, Statistics, Chemistry and Physics
- Publication Details
- Advanced photonics research, Vol.5(9), 2300325
- Publisher
- Wiley-VCH GmbH
- Number of pages
- 6
- Grant note
- ARC; Australian Research Council FL160100067 / Centre for Organic Photonics & Electronics at the University of Queensland DP210102192 / Australian Research Council
- Identifiers
- 991005866285607891
- Copyright
- © 2024 The Author(s).
- Murdoch Affiliation
- School of Mathematics, Statistics, Chemistry and Physics
- Language
- English
- Resource Type
- Journal article
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites
Metrics
1 Record Views