Enhanced black state induced by spatial silver nanoparticles in an electrochromic device

Ki Ryong Jeong,Sang-Hwan Cho,Illhwan Lee,Jong-Lam Lee,Chung Sock Choi,Jae Yong Park

doi:10.1038/am.2017.25

Ki Ryong Jeong, Sang-Hwan Cho + Show 4 more

Open Access

https://doi.org/10.1038/am.2017.25

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Abstract

The use of three-dimensional (3D) hierarchical indium tin oxide (ITO) branches of electrochromic devices (ECDs) is an effective approach for increasing the optical properties via localized surface plasmon resonance compared with two-dimensional nanostructured electrodes. ECDs with 3D branches were designed to operate in transparent, mirror and black states. Finite-difference time-domain simulation was used to find the electrical field distributions in three types of ECD: glass/ITO with Ag film, glass/ITO branches and glass/ITO branches with Ag nanoparticles. The ECDs had an optical transmittance of 73.76% in the transparent state, a reflectance of 79.77% in the mirror state and a reflectance of 8.78% in the black state. We achieved an ECD with high stability that can show ∼10 000 switching cycles among the three states.

Highlights

Electrochromic devices (ECDs) can exhibit reversible color changes induced by electric energy and the resulting electrochemical redox reactions of materials.[1,2] The changes in optical states are consequences of a change in the electronic state as a result of electron transfer between the electrochromic (EC) material and an electrode
Fabrication of indium tin oxide (ITO) branches The self-assembled single-crystalline ITO branches were grown in an e-beam evaporator.[32]
The morphology of ITO branches can be controlled by adjusting the parameters of the e-beam evaporation process

Summary

Introduction

Electrochromic devices (ECDs) can exhibit reversible color changes induced by electric energy and the resulting electrochemical redox reactions of materials.[1,2] The changes in optical states are consequences of a change in the electronic state as a result of electron transfer between the electrochromic (EC) material and an electrode. ECDs with 3D branches were designed to operate in transparent, mirror and black states.

Results

Conclusion