Terahertz time-domain spectroscopy of organic semiconductors

Daniel M. Hailu; Hany Aziz; Safieddin Safavi-Naeini; Daryoosh Saeedkia

doi:10.1117/12.1000097

27 March 2013 Terahertz time-domain spectroscopy of organic semiconductors

Daniel M. Hailu, Hany Aziz, Safieddin Safavi-Naeini, Daryoosh Saeedkia

Proceedings Volume 8624, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VI; 86240C (2013) https://doi.org/10.1117/12.1000097
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

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 absorption 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.

Citation Download Citation

Daniel M. Hailu, Hany Aziz, Safieddin Safavi-Naeini, and Daryoosh Saeedkia "Terahertz time-domain spectroscopy of organic semiconductors", Proc. SPIE 8624, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VI, 86240C (27 March 2013); https://doi.org/10.1117/12.1000097

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KEYWORDS

Terahertz radiation

Absorption

Organic semiconductors

Spectroscopy

Terahertz spectroscopy

Water

Nitrogen

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