Good Vibrations for Energy Applications
Elizabeth von Hauff a
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Invited Speaker Session, Elizabeth von Hauff, presentation 085
Publication date: 7th November 2016

Organic and hybrid semiconductors offer many advantages for energy conversion, saving and storage applications. However, the poor electrical properties of organic and nanostructured semiconducting films, particularly low carrier mobilities, trapping and recombination phenomena, are critical limitations for real applications. Surprisingly, carrier transport is still not well-understood in these systems, making it difficult to develop design strategies for high performance applications. In this talk I will focus on studying carrier transport in organic semiconductors. There is an increasing number of reports indicating the importance of considering the effects of molecular dynamics and vibrations on the evolution of excited states in this class of materials. New experimental strategies are urgently needed to correlate dynamic relationships between molecular structure and electrical transport.  I will present our current work on developing a new measurement approach which combines Raman and impedance spectroscopies. By monitoring the vibrational fingerprint of the organic semiconductor as a function of electrical perturbation, we investigate the influence of charge transport on molecular vibrations. With these results we aim to correlate molecular interactions with macroscopic electrical properties and device performance. I will demonstrate this approach applied to organic semiconductors, and give some examples of extending it towards nanostructured and hybrid photovoltaic systems.  



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