Structural characterization of high-efficiency molecular organic solar cells using high resolution transmission electron microscopy is performed by G. C. Bazan, T.-Q. Nguyen, and co-workers. On page 5019, these characterizations reveal welldefined, wire-like crystalline donor domains. Single crystal diffraction experiments of the donor material provide detailed information on the solid-state molecular orientation and packing within the wires and thereby provide unprecedented molecularlevel insight applicable for designing the next generation of energy conversion materials.
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Love et al. (2013) studied this question.