In this contribution, we will present different spectroscopic methods used to investigate organic mixed ionic-electronic conductors (OMIECs) which constitute a promising material class for interfacing biological systems with electronics. Organic electrochemical transistors (OECTs) are a solution for this task and are often used to benchmark OMIECs performance. Different studies have showed that polymers designed with hydrophilic solubilizing chains show better OECT performance, mostly due to their higher ionic uptake and stability in aqueous environments.
We explore how side chain engineering in poly(3-hexylthiophene) (P3HT) with different content of TriEthylene Glycol (TEG) impacts its electronic and ionic transport properties.
We present a new referencing scheme for visible and near infrared ultrafast Transient Absorption (TA) measurements using a signal and a referencing beam. Instead of using the traditional ratiometric approach, where the absorption changes are referenced at each wavelength independently, we use a method used in the infrared range that fully utilized the spectral correlation between the reference and signal. We applied this method on a setup that produces an ultrabroad white light (WL) probe beam spanning the 600-1700nm range. This WL is noisy as it is generated from the Idler of an optical parametric amplifier in a YAG crystal. The new referencing scheme allowed to completely suppress the noise introduced by the WL generation. We will present the method, the setup and its application to some new organic semiconducting materials used or photovoltaic applications that benefited a lot from the broad spectral coverage and the low noise of our TA setup.
We present a new technique for single shot Terahertz detection in electro-optics sampling (EOS) with a narrowband probe pulse shaped using a Fabry-Pérot etalon. The technique allows tdetection in the frequency domain using a high-resolution CCD spectrometer. The technique is simple and sensitive. It has a high time resolution and can be simply implemented in a standard EOS scanning experiment
In this work we study the ultrafast exciton dynamics in CdTe nanorods by using two-dimensional electronic spectroscopy (2DES). By simultaneously exciting the lowest three excitonic transitions (i.e. S1, S2 and S3) we extract the electron and hole relaxation pathways, owing to the combined temporal and spectral resolution of 2DES. In particular, we directly observe hot hole relaxation from the second to the first exciton state in about 30 fs by excitation of the S2 transition. Additionally, we extract a direct charge relaxation to S1 by disentangling the overlapping bleach and excited state induced energy level shifts after excitation of S3.
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