Film Morphology of High Efficiency Solution-Processed Small-Molecule Solar Cells

Morphological control over the bulk heterojunction (BHJ) microstructure of a high‐efficiency small molecule photovoltaic system is demonstrated using both thermal treatment and solvent additive processing. Single crystal X‐ray diffraction is utilized to understand molecular interactions in the solid...

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Bibliographic Details
Published in:Advanced functional materials 2013-10, Vol.23 (40), p.5019-5026
Main Authors: Love, John A., Proctor, Christopher M., Liu, Jianhua, Takacs, Christopher J., Sharenko, Alexander, van der Poll, Thomas S., Heeger, Alan J., Bazan, Guillermo C., Nguyen, Thuc-Quyen
Format: Article
Language:English
Subjects:
Additives
bulk heterojunction solar cells
film morphology
small molecules
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Summary:Morphological control over the bulk heterojunction (BHJ) microstructure of a high‐efficiency small molecule photovoltaic system is demonstrated using both thermal treatment and solvent additive processing. Single crystal X‐ray diffraction is utilized to understand molecular interactions in the solid state and the BHJ morphology is examined using bright field, high‐resolution, and cross‐section transmission electron microscopy techniques. Controlling the domain size, while maintaining good molecular order within the semiconducting donor material, is found to be crucial in achieving high performance and over 90% internal quantum efficiency exhibited under the optimized conditions. Morphological control over the bulk heterojunction (BHJ) microstructure of a small‐molecule photovoltaic system is demonstrated using thermal treatment and solvent additives. Single crystal X‐ray diffraction and transmission electron microscopy are utilized to investigate solid‐state interactions and the BHJ morphology. Domain size and molecular order are crucial to achieving the 7.0% power conversion efficiency and over 90% internal quantum efficiency exhibited under optimized conditions.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201300099