1. Understanding Solvent Manipulation of Morphology in Bulk-Heterojunction Organic Solar Cells.
- Author
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Chen, Yuxia, Zhan, Chuanlang, and Yao, Jiannian
- Subjects
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SOLAR cells , *HETEROJUNCTIONS , *HETEROSTRUCTURES , *SOLVENTS , *NANOSTRUCTURED materials - Abstract
Film morphology greatly influences the performance of bulk-heterojunction (BHJ)-structure-based solar cells. It is known that an interpenetrating bicontinuous network with nanoscale-separated donor and acceptor phases for charge transfer, an ordered molecular packing for exciton diffusion and charge transport, and a vertical compositionally graded structure for charge collection are prerequisites for achieving highly efficient BHJ organic solar cells (OSCs). Therefore, control of the morphology to obtain an ideal structure is a key problem. For this solution-processing BHJ system, the solvent participates fully in film processing. Its involvement is critical in modifying the nanostructure of BHJ films. In this review, we discuss the effects of solvent-related methods on the morphology of BHJ films, including selection of the casting solvent, solvent mixture, solvent vapor annealing, and solvent soaking. On the basis of a discussion on interaction strength and time between solvent and active materials, we believe that the solvent-morphology-performance relationship will be clearer and that solvent selection as a means to manipulate the morphology of BHJ films will be more rational. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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