A range of emerging materials, from polymer batteries, to perovskite solar cells, and even bioelectronic transistors, show strong variations in performance associated with the nanoscale structure of the active material. In this talk, I will discuss our work using a combination of multimodal in situ probes to unravel the often complex interplay of electronic, ionic, and even ferroelectric, behaviors that connect processing, structure, and function in these materials, with an emphasis in probing dynamic processes on timescales ranging from the sub-microsecond to hundreds of seconds. As an example, I will highlight the dynamics of ion motion in soft polymer films as a function of temperature, doping level, and polymer composition, and make quantitative comparisons between local time-resolved electrostatic force microscopy (trEFM) and bulk dynamics measured via electrochemical impedance in these systems. Finally, we show how these methods can also probe both fast (microsecond) scale ion dynamics at grain boundaries in halide perovskite thin films, as well as slow (hundreds of seconds) ion migration and defect formation in perovskite semiconductor devices.<br/>

Probing coupled charge transfer and ion transport in nanostructured thin films

255th National Meeting (2018)

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