Journal
ADVANCED ENERGY MATERIALS
Volume 4, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201400379
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Funding
- National Science Foundation to the University of Washington [NSF EFRI 1038165]
- Japan Society for the Promotion of Science (JSPS) [22350086]
- Directorate For Engineering
- Emerging Frontiers & Multidisciplinary Activities [1038165] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [22350086] Funding Source: KAKEN
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A new design for an energy-harvesting electrochromic window (EH-ECW) based on the fusion of two technologies, organic electrochromic windows and dye-sensitized solar cells (DSSCs), is presented. Unlike other power-generating smart windows, such as photoelectrochromic devices that are passive and only contain two states (i.e., a closed-circuit colored state and an open-circuit bleaching state), EH-ECW allows active tuning of the transmittance by varying the applied potential and it functions as a photovoltaic cell based on a DSSC. The resulting device demonstrates a fast switching rate of 1 s in both the bleaching and coloring processes through the use of an electrochromic polymer as a counter electrode layer. To increase the transmittance of the device, a cobalt redox couple and a light-colored, yet efficient, organic dye are used. The organic dye contains a polymeric structure that contributes to the high cyclic stability. The device exhibits a power conversion efficiency (PCE) of 4.5% (100 mW cm(-2)) under AM 1.5 irradiation, a change in transmittance of 34% upon applied potential, and shows only 3% degradation in the PCE after 5000 cycles.
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