Probing of Carrier Injection into Organic Field Effect Transistor by Optical Second Harmonic Generation

Ambipolar injection into pentacene field effect transistor observed by time-resolved optical second harmonic generation imaging

Ambipolar carrier injection from gold electrode into pentacene was investigated by time-resolved optical second harmonic generation (TRM-SHG) imaging. Smooth hole injection is verified by rapid decrease of the SHG intensity at the electrode edge, indicating the absence of an injection barrier. In contrast, TRM-SHG results clearly indicated the presence of electron injection from the high-work f...

Probing and modeling of carrier motion in organic devices by electric-field-induced optical second-harmonic generation

Direct imaging of carrier motion in organic transistors by optical second-harmonic generation

Second Harmonic Generation from Organic Optical Waveguides on Diffraction Gratings

We present experimental results of second harmonic generation using a waveguide of PUSC deposited on a silver diffraction grating. The reflected second harmonic signal is enhanced at the angles of resonant excitation of the guided modes or of the surface plasmon. At these angles, we observe unexpected minima in the second harmonic signal, when the second harmonic frequency is situated within th...

Direct probing of carrier motion and interfacial phenomena in organic films and devices by optical second harmonic generation and Maxwell- displacement-current

Probing and modelling of dynamical motions of carriers in organic materials is a fundamental research subject in science and electronics. According to the Maxwell’s electromagnetic field theory, electrons and dipoles are source of electric fields. As a result organic materials surrounding electrons and dipoles are polarized. By probing the dielectric polarization, we can visualize carrier motio...