ELECTROCHROMIC DEVICE HAVING COLOR REFLECTANCE AND TRANSMISSION
The disclosure generally relates to electrochromic devices comprising, in the following order a substantially transparent substrate (402); an optional diffusion barrier layer (412); a stack of interleaved index matching layers including a first index matching layer and a second index matching layer, the first index matching layer being preferably made of TiOx or Nb20s 41Q and having a higher refractive index than the second index matching layer preferably made of silicon oxide; a first conductive layer (420); a solid state and inorganic electrochromic stack (430); and a second conductive layer (440).
1 . An electrochromic device comprising, in the following order:
a substantially transparent substrate;
a stack of interleaved index matching layers including a first index matching layer and a second index matching layer, the first index matching layer having a higher refractive index than the second index matching layer;
a first conductive layer;
a solid state and inorganic electrochromic stack; and
a second conductive layer.
2 . The electrochromic device of claim 1 , wherein the first index matching layer is a TiO x material layer or an Nb 2 O 5 material layer.
3 . The electrochromic device of claim 2 , wherein the second index matching layer is a silicon oxide layer.
4 . The electrochromic device of claim 1 , further comprising a diffusion barrier layer.
5 . The electrochromic device of claim 4 , wherein the diffusion barrier layer is located between the substantially transparent substrate and the first index matching layer.
6 . The electrochromic device of claim 5 , wherein the diffusion barrier layer is a silicon oxide layer.
7 . The electrochromic device of claim 1 , wherein each of the first and second conductive layers is a transparent conductive oxide layer.
8 . The electrochromic device of claim 1 , wherein each of the first and second conductive layers is a one of a fluorinated tin oxide (FTO) layer, an indium tin oxide (ITO) layer, and an aluminum zinc oxide (AZO) layer.
9 . The electrochromic device of claim 1 or 3 , wherein the second index matching layer has a thickness in a range of about 20 nm to about 30 nm.
10 . The electrochromic device of claim 1 , wherein the first index matching layer is a transparent material having a refractive index of greater than about 2.2.
11 . The electrochromic device of claim 1 , wherein the first index matching layer is a transparent material having a refractive index in a range of about 2.2 to about 2.7.
12 . The electrochromic device of claim 1 or 2 , wherein the first index matching layer has a thickness in a range of about 5 nm and about 7 nm.
13 . The electrochromic device of claim 1 or 2 , wherein the first index matching layer has a thickness in a range of between 5 nm and 20 nm.
14 . The electrochromic device of any of claims 1 - 13 , wherein the substantially transparent substrate is soda lime glass.
15 . The electrochromic device of any of claims 1 - 14 , further comprising one or more defect mitigating insulating layers.
16 . An electrochromic device comprising, in the following order;
a substantially transparent substrate;
a diffusion barrier layer;
a TiO x material layer or a Nb 2 O 5 material layer;
a first conductive layer;
a solid state and inorganic electrochromic stack; and
a second conductive layer.
17 . The electrochromic device of claim 16 , wherein each of the first and second conductive layers is a transparent conductive oxide layer.
18 . The electrochromic device of claim 17 , wherein each of the first and second conductive layers is one of a fluorinated tin oxide (FTO) layer, an indium tin oxide (ITO) layer, and an aluminum zinc oxide (AZO) layer.
19 . The electrochromic device of claim 17 or 18 , wherein the substantially transparent substrate is soda lime glass.
20 . The electrochromic device of any of claims 17 - 19 , further comprising one or more defect mitigating insulating layers.