Influence of Intermixed Donor and Acceptor Domains on the Ultrafast Charge Generation in Bulk Heterojunction Materials
| Autor: | Jonathan A. Bartelt, Derong Cao, Yong Cao, Fei Huang, Chengmei Zhong, Michael D. McGehee, Alan J. Heeger |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Materials science Fullerene business.industry Nanotechnology Charge (physics) Polymer Acceptor Polymer solar cell Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amorphous solid law.invention Condensed Matter::Soft Condensed Matter Condensed Matter::Materials Science General Energy chemistry law Solar cell Optoelectronics Physical and Theoretical Chemistry Thin film business |
| Zdroj: | The Journal of Physical Chemistry C. 119:26889-26894 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b09572 |
| Popis: | Understanding how intermixed domains and pure domains in bulk heterojunction (BHJ) thin films affect charge generation and recombination in polymer solar cells (PSCs) is important to further improve PSC device performance. We control the proportion of intermixed domains and pure domains in an amorphous polymer and fullerene BHJ thin films by varying the fullerene concentration. By studying these thin films with ultrafast spectroscopy, we found that the coherent ultrafast charge generation process is nonexistent in this BHJ system due to the lack of pure polymer domains. We also found that the BHJ thin film with 100% intermixed domains begins charge recombination immediately after the initial charge generation process, while the BHJ thin film with pure fullerene domains showed an additional slow excitonic charge generation process before a slower charge recombination takes place. These results clearly demonstrate that pure domains are important for optimal BHJ solar cell performance. |
| Databáze: | OpenAIRE |
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