Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 11, Pages 8108-8114Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am500466q
Keywords
organic field-effect transistors; conjugated polyelectrolytes; charge injection; interfacial dipoles; air-stability
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2013-059210, 2008-0062606, NRF-2009-C1AAA001-2009-0092950]
- National Research Foundation of Korea [2008-0062606] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Here, we report the simultaneous attainment of efficient electron injection and enhanced stability under ambient conditions for top-gate/bottom-contact (TG/BC), n-type, organic field-effect transistors (OFETs) using water-soluble polyfluorene derivatives (WPFs). When inserting the WPF interlayers between a semiconductor and the BC Au electrodes, initially the ambipolar (6,6)-phenyl-C(61)butyric acid methyl ester (PCBM) OFETs were fully converted to unipolar charge transport characteristics that were exclusively n-type with significantly increased electron mobilities as high as 0.12 cm(2)/(V s) and a decreased threshold voltage. These improvements were mostly attributed to the interfacial dipoles of WPF layers that aligned to form a favorable energy band structure for efficient electron injection and to effectively block counter charge carriers. These were confirmed when values for the reduced work function of metal electrodes with WPFs and their correlated contact resistance were measured via the ultraviolet photoemission spectroscopy and the transmission-line method, respectively. Moreover, the WPF interlayers played an important role in air stability of PCBM OFETs that exhibited higher and appreciably enhanced by increasing the ethylene-oxide side chain lengths of WPFs, which presumably was due to the water/oxygen/ion capturing effects in the hydrophilic interlayers.
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