Terahertz time domain spectroscopy is being used to better understand the carrier dynamics in semiconducting polymers for high speed applications. Because it is sensitive to both charge carriers and bound excitons, it is a technique suited to the study of transient photoinduced carrier dynamics. Using a femtosecond optical pump to generate excitons and carriers along with a delayed terahertz probe permits noncontact characterization of the photoconductivity with sub-picosecond temporal resolution
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“Study of transient effects in photo-excited semiconducting polymer and its mixture with PCBM,” Yi-Hsing Peng, Weilou Cao, Min Du, Danilo Romero, Warren N. Herman, and Chi H. Lee, CLEO’07, Baltimore. May 2007,
“Ultrafast photo-conductivity in BAMH-PPV polymer thin films,” H. Y. Liang, W.L. Cao, M. Du, Y. Kim, W.N Herman, C. H. Lee, Chemical Physics Letters 419, 292(2006).
“Non-Contact Technique to Measure Conductivity of Thin Films using Terahertz Time-Domain Spectroscopy,” Y.-H. Peng, W. Cao, M. Du, W. N. Herman, and C. H. Lee, postdeadline paper, OSA Organic Photonics and Electronics Symposium, October 2006, Rochester.
“Transient Properties of Photoexcited Inorganic and Organic Semiconductors using Terahertz Time Domain Spectroscopy,” Yi-Hsing Peng, Weilou Cao, Victor Yun, Warren N. Herman, and Chi H. Lee, International Topical Meeting on Microwave Photonics, October 2006, Grenoble, France.