Molecular strategies to increase robustness of organic semiconductor thin films for application in photovoltaic and photoelectrochemical devices

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• Kevin Sivula EPFL
• Tuesday 21 January 2020, 14:00-15:00
• Raleigh Seminar Room, Maxwell Centre, Cavendish Laboratory.

If you have a question about this talk, please contact Amita Ummadisingu.

As organic semiconductors attract increasing attention to application in diverse fields such as bioelectronics and artificial photosynthesis, understanding and improving their robust operation in a variety of challenging environments is a critical task. In this presentation, results from our lab are highlighted including our development of a morphology control strategy using conjugation-break spacers [1], demonstration of melt-processed small-molecule OPVs [2], and investigations of covalently-linked block³ and network polymers⁴, which afford tunable charge transport and solvent tolerance—making them promising for application as charge-transport interlayers in all-solution processed devices. In addition, the application of bulk-heterojunctions to artificial photosynthesis via photoelectrochemical water splitting⁵ will be discussed in terms of the requirements for material stability. In this regard, our recent work in understanding the roles of charge transport and accumulation at the organic semiconductor/electrolyte interface has led to significant advances in the stability and performance of organic semiconductor photocathodes for direct solar water reduction into hydrogen. [1] Adv. Mater. 2015, 27, 5541. [2] Green Chem. 2018, 20, 2218. [3] ACS Macro Lett. 2019, 8, 134. [4] Adv. Funct. Mater. 2018, 28, 1706303. [5] Adv. Energy Mater. 2018, 1802585.

This talk is part of the Optoelectronics Group series.

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