研究目的
Evaluating intrinsic mobility from transient terahertz conductivity spectra of microcrystal samples of organic molecular semiconductors.
研究成果
The intrinsic mobility values of organic molecular semiconductors can be evaluated from the measurements of microcrystal samples using transient terahertz spectroscopy, as demonstrated by the comparable mobility values obtained from the analysis of ~r xe T spectra in microcrystalline pellets and transport measurements of single-crystal and polycrystalline FETs.
研究不足
The method's effectiveness may vary with the dimensionality of the electronic structure in organic molecular semiconductors and the presence of extrinsic disorders.
1：Experimental Design and Method Selection:
Optical-pump terahertz-probe spectroscopy was used to measure spectra of complex optical conductivity caused by photocarriers in microcrystal samples of rubrene and C10-DNTT. The Drude-Smith model was applied to analyze the spectra.
2：Sample Selection and Data Sources:
Single crystals of rubrene were obtained by physical vapor transport and ground into microcrystal powder pressed into pellets. C10-DNTT powder was provided by Nippon Kayaku, ground further, and pressed into pellets.
3：List of Experimental Equipment and Materials:
Ti:sapphire regenerative amplifier for laser source, air plasma-induced terahertz generation, electro-optical sampling for detection, ZnTe, GaP, and ZnTe EO crystals depending on the frequency range.
4：Experimental Procedures and Operational Workflow:
The delay time of the terahertz probe pulse relative to the pump pulse was varied by controlling the path length of the pump pulse. The refractive index of C10-DNTT at the THz frequencies was evaluated using THz time domain spectroscopy.
5：Data Analysis Methods:
The ~r xe T spectra were analyzed using the Drude-Smith model to evaluate the DC mobility lDC and the intrinsic mobility lint.
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