The role of charge transfer at reduced graphene oxide/organic semiconductor interface on the charge transport properties
The effect of 1-pyrenesulfonicacid sodium salt (1-PSA), tetracyanoethylene (TCNE) and tetrafluoro- tetracyanoquinodimethane (F4-TCNQ) on charge transport properties of reduced graphene oxide (RGO) is examined by measuring the transfer characteristics of field-effect transistors and co-planar time-of-flight photocurrent technique. Evidence of p-type doping and a reduction of mobility of electrons in RGO upon deposition of these materials is observed. Time-resolved photocurrent measurements show a reduction in elec- tron mobility even at submonolayer coverage of these materials. The variation of transit time with different coverages reveals that electron mobility decreases with increasing the surface coverage of 1-PSA, TCNE and F4- TCNQ to a certain extent, while at higher coverage the electron mobility is slightly recovered. All three molecules show the same trend in charge carrier mobility variation with coverage, but with different magnitude. Among all three molecules, 1-PSA acts as weak electron acceptor compared to TCNE and F4-TCNQ. The additional fluorine moieties in F4-TCNQ provides excellent electron withdrawing capability compared to TCNE. The experimental results are consistent with the density functional theory calculations.
2019
2019-10-28 01:47:26
1033
organic semiconductors, reduced graphene oxide, time-resolved photocurrent measurements, organic thin film transistors
r6
Gvido
Bratina
70
Egon
Pavlica
70
COBISS_ID
3
5473275
DOI
15
10.1016/j.orgel.2019.105499
NUK URN
18
URN:SI:UNG:REP:UFISCPAF
Manuscript_V9_GB-VP.docx
7209479
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2019-10-28 01:49:00
RAZ_Bratina_Gvido_i2019.pdf
2331386
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2019-10-28 02:39:23
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2019-10-28 01:47:28