Nanoscale Morphology of PTB7 Based Organic Photovoltaics as a Function of Fullerene Size.

ABSTRACT: High efficiency polymer:fullerene photovoltaic device layers self-assemble with hierarchical features from ångströms to 100's of nanometers. The feature size, shape, composition, orientation, and order all contribute to device efficiency and are simultaneously difficult to study due to poor contrast between carbon based materials. This study seeks to increase device efficiency and simplify morphology measurements by replacing the typical fullerene acceptor with endohedral fullerene Lu3N@PC80BEH. The metal atoms give excellent scattering contrast for electron beam and x-ray experiments. Additionally, Lu3N@PC80BEH has a lower electron affinity than standard fullerenes, which can raise the open circuit voltage of photovoltaic devices. Electron microscopy techniques are used to produce a detai

SUBMITTER: Roehling JD 

PROVIDER: S-EPMC4976328 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature