Journal
SMALL
Volume 14, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201800842
Keywords
aqueous flexible DSSCs; aqueous polymer gel electrolytes; interfacial cooling recovery; self-healing DSSCs; thermoreversibility
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Funding
- Department Of Science and Technology (DST), New Delhi, India [DST/TM/CERI/C285(G)]
- UGC-CPEPA program UGC, New Delhi, India [1-14/2002-2016]
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Quasi-solid-state dye-sensitized solar cells (DSSCs) fabricated with lightweight flexible substrates have a great potential in wearable electronic devices for in situ powering. However, the poor lifespan of these DSSCs limits their practical application. Strong mechanical stresses involved in practical applications cause breakage of the electrode/electrolyte interface in the DSSCs greatly affecting their performance and lifetime. Here, a mechanically robust, low-cost, long-lasting, and environment-friendly quasi-solid-state DSSC using a smart thermoreversible water-based polymer gel electrolyte with self-healing characteristics at a low temperature (below 0 degrees C) is demonstrated. When the performance of the flexible DSSC is hindered by strong mechanical stresses (i.e., from multiple bending/twisting/shrinking actions), a simple cooling treatment can regenerate the electrode/electrolyte interface and recover the performance close to the initial level. A performance recovery as high as 94% is proven possible even after 300 cycles of 90 degrees bending. To the best of our knowledge, this is the first aqueous DSSC device with self-healing behavior, using a smart thermoreversible polymer gel electrolyte, which provides a new perspective in flexible wearable solid-state photovoltaic devices.
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