期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 42, 页码 28633-28640出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09955
关键词
self-assembly; energy transfer; electron transfer; bilayer; DSSC
资金
- Army Research Office [W911NF-14-1-0660]
- National Science Foundation [DGE-1449440, CHE-1531629]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1531629] Funding Source: National Science Foundation
Current high efficiency dye-sensitized solar cells (DSSCs) rely on the incorporation of multiple chromophores, via either codeposition or preformed assemblies, as a means of increasing broad band light absorption. These strategies have some inherent limitations including decreased total light absorption by each of the dyes, low surface loadings, and complex synthetic procedures. In this report, we introduce an alternative strategy, self-assembled bilayers, as a simple, stepwise method of incorporating two complementary chromophores into a DSSC. The bilayer devices exhibit a 10% increase in J(sc), V-oc, and eta over the monolayer devices due to increased incident photon-to-electron conversion efficiency across the entire visible spectrum and slowed recombination losses at the interface. Directional energy and electron transfer toward the metal oxide surface are key steps in the bilayer photon-to-current generation process. These results are important as they open the door to a new architecture for harnessing broadband light in dye-sensitized devices.
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