Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.cap.2018.05.002
Title: Energy level alignment of blended organic semiconductors and electrodes at the interface
Authors: Whitcher, TJ 
Wong, WS
Talik, AN
Woon, KL
Rusydi, A 
Chanlek, N
Nakajima, H 
Saisopa, T
Songsiriritthigul, P
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Materials Science
Physics
Energy level alignment
Vacuum level
Blended organic semiconductors
HETEROJUNCTION SOLAR-CELLS
METAL INTERFACES
BARRIER HEIGHTS
CHARGE-TRANSFER
LAYER
POLY(3-HEXYLTHIOPHENE)
1ST-PRINCIPLES
EFFICIENCY
POLYMER
SURFACE
Issue Date: 1-Sep-2018
Publisher: ELSEVIER SCIENCE BV
Citation: Whitcher, TJ, Wong, WS, Talik, AN, Woon, KL, Rusydi, A, Chanlek, N, Nakajima, H, Saisopa, T, Songsiriritthigul, P (2018-09-01). Energy level alignment of blended organic semiconductors and electrodes at the interface. CURRENT APPLIED PHYSICS 18 (9) : 982-992. ScholarBank@NUS Repository. https://doi.org/10.1016/j.cap.2018.05.002
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
Abstract: © 2018 Korean Physical Society The energy level alignment of a blended mixture of organic semiconductors is often depicted as having a common vacuum level. However, this is not a universal phenomenon among the vast number of organic semiconductors that currently exist, as in many cases the energy levels align via the Fermi level. In this report, the energy level alignments of the mixtures; poly(9-vinylcarbazole) (PVK) and 2,7-bis(diphenylphosphoryl)-9,9′-spirobifluorene (SPPO13) and poly(3-hexylthiophene-2,5-diyl) (P3HT) and SPPO13, with varying SPPO13 concentrations, are measured. It was found that the blended systems exhibit two different vacuum levels with the dipole between the PVK and SPPO13 increasing with the SPPO13 concentration, whilst the P3HT and SPPO13 vacuum levels only experience a small change. This is attributed to the decreasing electronic screening with increasing SPPO13 concentration. These new observations have an important implication in our understanding of interfacial behaviour for blended systems commonly used in various organic electronic devices.
Source Title: CURRENT APPLIED PHYSICS
URI: https://scholarbank.nus.edu.sg/handle/10635/155056
ISSN: 15671739
18781675
DOI: 10.1016/j.cap.2018.05.002
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
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