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Terahertz Time-Domain Spectroscopy of Organic Semiconductors

机译：太赫兹时域光谱的有机半导体

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摘要

In this paper, we conduct transmission and reflection mode terahertz time-domain spectroscopy (THz-TDS) measurements of organic semiconductors such as ALQ3 and TBADN. THz-TDS is effective for determining the purity of the organic semiconductors based on the refractive index and spectral signatures in THz range. In order to prepare the sample for a custom built sample holder, the powder samples are pressed into pellets of 13 mm diameter and a thickness of 2 mm using a hydraulic press. The organic semiconductor, for example ALQ3 sample, is prepared as a 70% ALQ3 and 30% polyethylene (PE) concentration pellet by mixing ALQ3 and PE. The ALQ3 pellet is measured in a chamber purged with dry nitrogen to avoid the effect of water vapor absorptions in ambient air. The abs orption coefficient and index of refraction are measured from the spectra of the reference THz pulse and the THz pulse after transmission through the sample. The THz spectrum is obtained by applying a fast Fourier transform to the THz waveform. Further studies were conducted by reducing the concentration of the organic semiconductor from 70% to 10% ALQ3. We also obtained the spectral signature and absorption coefficient for 50% TBADN 50% PE pellet. The spectral signatures of ALQ3 were found to be at 0.868 THz, 1.271 THz and 1.52 THz, while spectral signature of TBADN was found to be at 1.033 THz.
机译：在本文中，我们对有机半导体（如ALQ3和TBADN）进行了透射和反射模式太赫兹时域光谱（THz-TDS）测量。 THz-TDS可有效地根据THz范围内的折射率和光谱特征确定有机半导体的纯度。为了准备用于定制样品架的样品，使用液压机将粉末样品压制成直径13毫米，厚度2毫米的颗粒。通过混合ALQ3和PE，将有机半导体（例如ALQ3样品）制成70％ALQ3和30％聚乙烯（PE）浓缩颗粒。在用干燥氮气吹扫的室内测量ALQ3沉淀物，以避免周围空气吸收水蒸气的影响。从参考THz脉冲和透射过样品后的THz脉冲的光谱测量吸收系数和折射率。通过对THz波形进行快速傅里叶变换，可以得到THz频谱。通过将有机半导体的浓度从70％降至10％ALQ3，进行了进一步的研究。我们还获得了50％TBADN 50％PE颗粒的光谱特征和吸收系数。发现ALQ3的光谱特征为0.868THz，1.271THz和1.52THz，而发现TBADN的光谱特征为1.033THz。

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