Dopant controlled trap-filling and conductivity enhancement in an electron-transport polymer

Journal Article · Mon Apr 20 04:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4918627· OSTI ID:22398936

Higgins, Andrew; Kahn, Antoine ^[1]; Mohapatra, Swagat K.; Barlow, Stephen; Marder, Seth R. ^[2]

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1. Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544-5263 (United States)
2. Center for Organic Photonics and Electronics and School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400 (United States)

Charge transport in organic semiconductors is often inhibited by the presence of tail states that extend into the band gap of a material and act as traps for charge carriers. This work demonstrates the passivation of acceptor tail states by solution processing of ultra-low concentrations of a strongly reducing air-stable organometallic dimer, the pentamethylrhodocene dimer, [RhCp*Cp]{sub 2}, into the electron transport polymer poly([N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide) -2,6-diyl]-alt-5,5′-(2,2′-bithiophene)), P(NDI{sub 2}OD-T{sub 2}). Variable-temperature current-voltage measurements of n-doped P(NDI{sub 2}OD-T{sub 2}) are presented with doping concentration varied through two orders of magnitude. Systematic variation of the doping parameter is shown to lower the activation energy for hopping transport and enhance film conductivity and electron mobility.

• OSTI ID: 22398936
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 106; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
CHARGE CARRIERS
CHARGE TRANSPORT
CONCENTRATION RATIO
DIMERS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRIC POTENTIAL
ELECTRON MOBILITY
ELECTRONS
FILMS
NAPHTHALENE
ORGANIC SEMICONDUCTORS
ORGANOMETALLIC COMPOUNDS
POLYMERS
TRAPS