Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 186, Issue -, Pages 266-272Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2018.06.037
Keywords
Switchable devices; Thermosensitive polymer; Joule heating; Stimuli-sensitive materials; Transparent conducting substrates
Funding
- Sao Paulo Research Foundation (FAPESP) [2013/25663-2, 2015/13958-3]
- CEPID/CDMF grant [2013/07296-2]
- CNPq
- CAPES
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Upcoming generation of smart windows requires simple design, fast stimulus response and cost-effective production. Aiming these features, we reported a new approach of switchable devices based on the thermosensitive polymer poly(N-vinylcaprolactam) (PNVCL) and facile assembly of the components (FTO layers and polymer). Its optical/color change from transparent to opaque is temperature-dependent and activated by induced Joule heating of conductive substrates. Therefore, the reported devices showed fast reversible response (less than 60 s) by small input power and adjustable opaqueness according to polymer concentration. In opposite to traditional electrochromic smart windows dependence of the kinetics charge-transfer reaction, the observed features are triggered by the thermodynamic mechanism of the reversible coil-globule transition from PNVCL suspension, which can lead to stable performance of the proposed device.
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