Abstract
In organic photovoltaic (OPV) devices the formation of free charges from a singlet excited state is the key step in converting light to electrical energy. However, questions still remain as to why the process is so fast and efficient in some OPV devices while not in others. Currently, it is not understood how the binding energy of the charge transfer state formed at an organic/organic interface, ~40 kT, is overcome in order to create free charge carriers. Given the difficulty of experimentally probing the electronic processes occurring at the organic/organic interface, it falls to theoretical and computational studies to provide essential insights into the processes occurring on the microscopic level. In this review we will cover the contributions made by theoretical studies to improve our understanding of the organic/organic interface. We will address the advantages and disadvantages of different theoretical approaches to studying the numerous interesting effects observed, such as shifts in the HOMO and LUMO levels due to the electrostatic environment, increased localization due to disorder, and the general impact of molecular orientation on different molecular properties. Further, we will discuss the currently proposed mechanisms of charge separation at the organic/organic interface and the implications that these mechanisms have on the choice of materials for use in OPV devices.
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Yost, S.R., Hontz, E., McMahon, D.P., Van Voorhis, T. (2014). Electronic and Optical Properties at Organic/Organic Interfaces in Organic Solar Cells. In: Beljonne, D., Cornil, J. (eds) Multiscale Modelling of Organic and Hybrid Photovoltaics. Topics in Current Chemistry, vol 352. Springer, Berlin, Heidelberg. https://doi.org/10.1007/128_2013_462
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