CONTROLLING DONOR-ACCEPTOR INTERFACES IN EXCITONIC DEVICES USING NANOPOROUS METAL-ORGANIC FRAMEWORK TEMPLATES

摘要

Recent investigations demonstrate that donoracceptor orientation and disorder play important roles in determining the efficiency of exciton-based devices such as OLEDs and organic photovoltaics. However, inherent disorder in typical active materials makes controlling these factors difficult, impeding rational design. Nanoporous Metal-Organic Frameworks (MOFs) are an attractive template for probing these effects, since donor and acceptor can be confined within a highly ordered, synthetically flexible environment. We describe experiments and first-principles modeling of fullerenes and thiophenes infiltrated into MOF nanopores, creating donoracceptor complexes that mimic molecular-scale phenomena in polymer-fullerene blends. The results provide insight into charge transfer interactions involving the framework and guests, suggesting ways that MOFs could be used in electronic devices that involve charge separation.