Fig. 5: Large-area transmissive-to-black n-PBDF-based EC windows and building energy simulation. | Nature Communications

Fig. 5: Large-area transmissive-to-black n-PBDF-based EC windows and building energy simulation.

From: Robust fast-switching black electrochromic windows based on solution-processed n-doped transparent organic conductor

Fig. 5

a Photographs of an n-PBDF-based black EC window (80 × 60 mm2) featuring an n-PBDF film (d ~ 190 nm, achieving T ~ 5% at 550 nm) under applied potentials of +1.8 V (left) for the colored state and −1.0 V (right) for the bleached state and. b Optical transmittance at λ = 550 nm with on/off switching duration of 10 s, measured at the center (black) and edge (red) regions of the black EC window in (a). c Schematic illustration of a large-area n-PBDF-based black EC windows designed for active modulation of solar light and heat, accompanied by cross-sectional views of a single EC window and an EC insulating glass unit (EC-IGU). d Distribution of solar heat gain coefficient versus visible light transmittance for a single n-PBDF (d ~ 90 nm) EC window and an EC-IGU window, evaluated by applied potentials. e Simulated HVAC energy savings map for a midrise apartment building across the United States, incorporating n-PBDF-based EC window (with EC-IGU window). f Estimated annual HVAC energy savings for a midrise apartment building in representative U.S. cities.

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