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Electrochromic window with high reflectivity modulation

Patent ·
OSTI ID:873118
 [1];  [2];  [3];  [4];  [5]
  1. Lexington, MA
  2. Medford, MA
  3. Arlington, MA
  4. Cambridge, MA
  5. Southborough, MA
+ Show Author Affiliations

A multi-layered, active, thin film, solid-state electrochromic device having a high reflectivity in the near infrared in a colored state, a high reflectivity and transmissivity modulation when switching between colored and bleached states, a low absorptivity in the near infrared, and fast switching times, and methods for its manufacture and switching are provided. In one embodiment, a multi-layered device comprising a first indium tin oxide transparent electronic conductor, a transparent ion blocking layer, a tungsten oxide electrochromic anode, a lithium ion conducting-electrically resistive electrolyte, a complimentary lithium mixed metal oxide electrochromic cathode, a transparent ohmic contact layer, a second indium oxide transparent electronic conductor, and a silicon nitride encapsulant is provided. Through elimination of optional intermediate layers, simplified device designs are provided as alternative embodiments. Typical colored-state reflectivity of the multi-layered device is greater than 50% in the near infrared, bleached-state reflectivity is less than 40% in the visible, bleached-state transmissivity is greater than 60% in the near infrared and greater than 40% in the visible, and spectral absorbance is less than 50% in the range from 0.65-2.5 .mu.m.

Research Organization:
Tufts University
DOE Contract Number:
FG02-95ER14578
Assignee:
Trustees of Tufts College (Medford, MA)
Patent Number(s):
US 6094292
OSTI ID:
873118
Country of Publication:
United States
Language:
English

References (25)

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The Preparation and Characterization of Lithium Cobalt Oxide thin Films by LPCVD journal January 1995
Characterization Technique For Transparent Ion Conducting Films conference November 1987
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Structural Considerations of Layered and Spinel Lithiated Oxides for Lithium Ion Batteries journal January 1995
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High near‐infrared reflectivity modulation with polycrystalline electrochromic WO 3 films journal December 1983
Improved Colored State Reflectivity In Lithiated WO 3 Films conference November 1987
Properties of a Carbon Negative Electrode in Completely Inorganic Thin Film Li-Ion Batteries with a LiCoO 2 Positive Electrode journal January 1994
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Further evidence for free electrons as dominating the behavior of electrochromic polycrystalline WO 3 films journal September 1985
Prototype All-Solid Lithiated Smart Window Devices conference November 1987

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Related Subjects

/359/427/
40
50
60
65-2
absorbance
absorptivity
active
alternative
alternative embodiment
alternative embodiments
anode
bleached
bleached-state
blocking
cathode
colored
colored-state
complimentary
comprising
conducting-electrically
conductor
contact
contact layer
designs
device
device comprising
electrically resistive
electrochromic
electrochromic device
electrochromic window
electrolyte
electronic
electronic conductor
elimination
embodiment
embodiments
encapsulant
fast
film
indium
indium oxide
infrared
intermediate
intermediate layer
intermediate layers
layer
layers
lithium
manufacture
metal
metal oxide
methods
mixed
mixed metal
modulation
multi-layered
near
near infrared
nitride
ohmic
ohmic contact
optional
oxide
provided
range
reflectivity
resistive
silicon
silicon nitride
simplified
solid-state
spectral
switching
times
transmissivity
transparent
transparent ohmic
tungsten
tungsten oxide
typical
visible
window