The Electro-Optical Physics of Organic Solar Cells and Photodiodes


Prof. Paul Meredith, The University of Queensland
Note that this colloquium will be held in 07-222 (Parnell Building) at 3pm

Organic semiconductors have emerged over the past two decades as useful and versatile additions to their inorganic counterparts. The diversity and molecular design flexibility of organic semiconductors is astounding – think about how many ways you can put together C, H, O, N and other like elements, and the varied bonding nature of carbon. In a world which is increasingly concerned with global warming and greenhouse gas emissions, pouring energy into refining silicon or other inorganic semiconductors for seemingly non-essential applications appears and probably is a flagrant waste of global resources. Organic semiconductors have intrinsically “low embedded energy”, and can often be processed using simple, cheap methods such as roll-to-roll deposition of liquid components. Although organic semiconductors do not possess the intrinsic performance properties of materials such as GaAs, for many applications their physics is perfectly adequate.

In my talk I will summarise some basic properties of organic semiconductors such as their excitonic nature and disordered transport. I will then focus on how we can create efficient solar cells and photodiodes using blends of n-and-p-type molecules and specifically discuss the electro-optics of diode cavities and how they can be manipulated to control the spectral response and efficiency. I will project this understanding forward to the “scaling-physics” of organic solar cells, and conclude by highlighting recent exciting progress in the area of organic-inorganic perovskite systems which are taking the semiconductor world by storm.

Prof. Paul Meredith – The Electro-Optical Physics of Organic Solar Cells and Photodiodes from School of Mathematics & Physics on Vimeo.