Materials design of fullerene acceptors has become an increasingly relevant topic in photovoltaics research. Synthetic modifications of C60 fullerene can be utilized to impart functionality and vary frontier orbital energies, enhancing structural and electronic compatibility with p-type materials in organic solar cells. For most photovoltaic applications, the ability to modulate C60's LUMO is of great interest because a tunable electron affinity would facilitate a higher degree of control over Vocs in heterojunction active layers. Furthermore, minimization of energy loss during photoinduced charge transfer would likely lead to noticeable improvements in charge extraction and power conversion efficiencies.Here we present a systematic study of the influence of tether directed fullerene bisadducts in bulk heterojunction devices. The electrical properties of these polymer/tether directed fullerene bisadduct systems are discussed and correlated to structural observations from 2D x-ray and depth profiling experiments. 

Multifunctional fullerenes for application in organic solar cells

245th National Meeting (2013)

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