WIN Seminar - Professor Ayse Turak "Solution processed nanoparticles for interfacial engineering in organic photovoltaics"

Thursday, November 3, 2016 3:00 pm - 4:00 pm EDT (GMT -04:00)

The Waterloo Institute for Nanotechnology (WIN) presents a seminar by Professor Ayse Turak, from the Department of Engineering Physics, McMaster University Ontario, Canada

Solution processed nanoparticles for interfacial engineering in organic photovoltaics


The next generation of solar cells need to be cheap, accessible and flexible for widespread adoption. Solar cells based on semiconducting organic molecules (organic photovoltaics or OPVs) have already been recognized as a key strategic approach for flexible and economic solar power devices. Among all alternative solar technologies, OPVs have the potential to be the most cost-effective for consumers in the long term. However, the success of OPVs depends on resolving current technological obstacles: low efficiencies, short lifetimes and high costs. Our work, focussing on cheap solution-based routes for nanostructuring in OPVs, are critical to meeting the 10-10 performance and stability targets (10% efficiency, 10 year lifetime) necessary for device commercialization. In our work, we focus on nanoparticle dispersions in periodic, quasi-periodic, oriented, and randomly distributed networks at electrode interfaces with organic semiconductors. Incorporation of interlayers at the electrode surface is a key design strategy for improving device efficiency, light management, and operational stability. Typically interlayers are deposited by vacuum thermal evaporation, adding complexity and cost to device manufacture. Systematically controlling the dispersion during evaporation is extremely challenging. Our approach is to use solution chemistry methods to deposit and control the dispersion of our interlayers, using a simple technique for assembling a 2D array of nanoparticles: reverse micelle deposition. Using this approach, we have been studying a variety of oxide and dielectric nanoparticles to understand the nature of interfaces in such devices. By varying the chemistry, morphology, refractive indicies, and work functions of our nanoparticle arrays, we aim to shed light on the coupling of electronic and optical enhancements in device structures, to decouple the effects of interfacial reactions from those from non-homogeneous electric field distributions on device degradation, and to uncover the complicated effects of optimized submonolayer coverage.