Electrochromic window with high reflectivity modulation

Patent · Tue Jul 25 04:00:00 EDT 2000

OSTI ID:20076143

Goldner, R B; Gerouki, A; Liu, T Y; Goldner, M A; Haas, T E

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 mum.

• Sponsoring Organization: US Department of Energy
• DOE Contract Number: FG02-95ER14578; FG03-85SF15927
• OSTI ID: 20076143
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
DESIGN
ELECTROCHROMISM
FABRICATION
INDIUM OXIDES
LITHIUM COMPOUNDS
NEAR INFRARED RADIATION
SILICON NITRIDES
SPECTRAL RESPONSE
TIN OXIDES
TUNGSTEN OXIDES
VISIBLE RADIATION
WINDOWS