Carrier transport characteristics in organic field‐effect transistors were compared for vapor‐deposited thin films and epitaxially grown needle crystals of biphenyl‐capped thiophene oligomers with different lengths of the thiophene units. The hole mobility of the thin films deposited on Si/SiO2 substrate was improved up to 0.17 cm2 V–1 s–1 by formation of platelet crystallites with a domain size of a few micrometer. The hole transport in the epitaxial needle crystals grown on the KCl surface depended upon the molecular orientation with respect to the channel direction. The orientation of the needle axis bridging over the source–drain electrodes increased the mobility since π‐electronic interaction through the parallel stack of the linear molecules enhanced the carrier transport along the needle. The deposition condition and electronic energy levels of the oligomers, depending on the length of the thiophene units, also affected their characteristics.
Few-layered antimonene (FLSb) nanosheets were noncovalently functionalized with fullerene C 60 clusters by quick addition of ap oor solvent( i.e.,a cetonitrile) into a mixed dispersion of FLSb and C 60 in ag ood solvent( i.e.,t oluene). In aflash-photolysis time-resolved microwaveconductivity (FP-TRMC) measurement, the FLSb-C 60 composite, (FLSb + C 60 ) m ,s howed ar apid rise in transient conductivity, whereas no conductivity signal was observed in the single components,F LSb and C 60 .T his demonstrated the occurrence of photoinduced charges eparation between FLSb and C 60 in (FLSb + C 60 ) m .F urthermore, ap hotoelectrochemical devicew ith an electrophoretically deposited (FLSb + C 60 ) m film exhibited an enhanced efficiencyofphotocurrent generation, compared to those of the single-components, FLSb and C 60 ,d ue to the photoinduced charge separation between FLSb and C 60 .T his work provides ap romising approach for fabrication of antimonene-organic molecule compositesa nd paves the way for their application in optoelectronics.
Exclusive photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographene were achieved in porphyrin–nanographene linked systems.
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