TY - JOUR

T1 - Polythiophene-nanoWO3 bilayer as an electrochromic infrared filter

T2 - A transparent heat shield

AU - Chaudhary, Anjali

AU - Pathak, Devesh K.

AU - Tanwar, Manushree

AU - Koch, Julian

AU - Pfnür, Herbert

AU - Kumar, Rajesh

N1 - Funding information: Authors acknowledge funding received from Science and Engineering Research Board (SERB), Govt. of India (grant no. CRG/2019/000371). Authors are thankful to Dr I. A. Palani (IIT Indore) for thermal imaging experiments. Authors acknowledge the SIC facility (IIT Indore) for various measurements. A. C. thanks Mr Alfa Sharma and Ms Komal Mulchandani for help. D. K. P. acknowledges Council of Scientific and Industrial Research (CSIR) for financial assistance. A. C. and M. T. acknowledge IIT Indore and DST, Govt. of India, for providing fellowships. Facilities received from Department of Science and Technology (DST), Govt. of India, under FIST scheme (Grant number: SR/FST/PSI-225/2016) are highly acknowledged. Useful discussion with Dr Jitendra Kumar (CSIR-CEERI Pilani, India) and Professor Rajneesh Mishra (IIT Indore) and partial from TEQIP collaborative research are also acknowledged.

PY - 2020/2/7

Y1 - 2020/2/7

N2 - A power-efficient, ultrafast and stable organic-inorganic hybrid electrochromic device fabricated using WO3 and P3HT as active materials has been demonstrated herein for dual application in an electrochromic window as well as an IR filter. The device when turned ON using a bias as low as 1 V shows heat shielding effect as well as increased optical transparency to keep the area cooler by ∼8 °C (22%) to maintain the room temperature at 302 K, as imaged using an IR camera. The solid state electrochromic IR filter device was fabricated in simple cross bar geometry with the WO3/P3HT bilayer sandwiched between two electrodes. The device works on the principle of a bias-induced redox change process, as established using electrochemical and spectroscopic investigations. The device exhibits superior electrochromic behavior with dual function, with a maximum color contrast of ∼60% in the IR region with excellent coloration efficiency of ∼380 cm2 C-1 at 520 nm and stability of more than 1600 ON/OFF cycles without compromising its performance. Possibility of the device to be used as an electrochromic window and heat shield has been demonstrated using real life experiments.

AB - A power-efficient, ultrafast and stable organic-inorganic hybrid electrochromic device fabricated using WO3 and P3HT as active materials has been demonstrated herein for dual application in an electrochromic window as well as an IR filter. The device when turned ON using a bias as low as 1 V shows heat shielding effect as well as increased optical transparency to keep the area cooler by ∼8 °C (22%) to maintain the room temperature at 302 K, as imaged using an IR camera. The solid state electrochromic IR filter device was fabricated in simple cross bar geometry with the WO3/P3HT bilayer sandwiched between two electrodes. The device works on the principle of a bias-induced redox change process, as established using electrochemical and spectroscopic investigations. The device exhibits superior electrochromic behavior with dual function, with a maximum color contrast of ∼60% in the IR region with excellent coloration efficiency of ∼380 cm2 C-1 at 520 nm and stability of more than 1600 ON/OFF cycles without compromising its performance. Possibility of the device to be used as an electrochromic window and heat shield has been demonstrated using real life experiments.

UR - http://www.scopus.com/inward/record.url?scp=85079103087&partnerID=8YFLogxK

U2 - 10.1039/c9tc05523a

DO - 10.1039/c9tc05523a

M3 - Article

AN - SCOPUS:85079103087

VL - 8

SP - 1773

EP - 1780

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

SN - 2050-7534

IS - 5

ER -