Abstract
Advances in organic photovoltaic (OPV) based solar cell device technology have increased power conversion efficiencies (PCE) beyond 11% [1], pushing flexible architecture OPV devices closer to being a viable low-cost, environmentally friendly alternative to contemporary inorganic based solar cells [2, 3]. Extending OPV performance beyond this limit is a critical challenge that requires better understanding of the PCE limiting processes. Since only photo-generated excitons that diffuse to the interface between electron donor and acceptor materials can dissociate into holes and electrons, understanding the chemistry and molecular structure of this interface is critical to identifying and mitigating these limitations. Other factors such as the amount of light absorption, efficiency of photogeneration of electrons and holes, and their collection efficiency at the respective electrodes must also be optimized in order to improve the device PCE. Electron energy-loss spectroscopy (EELS) is an extremely useful tool that can be used to probe the nature and structure of these interfaces and further the understanding of processes that occur there.
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