Large area self-powered semitransparent trifunctional device combining photovoltaic energy production, lighting and dynamic shading control

- Trifunctional panel combining a photo-electrochromic device and an OLED module.
- All-printed 12×17 cm2 PEC module, with DSSC (η=2.4%) and EC area (ΔT =42% @700 nm).
- 10×8 cm2 transparent white OLED with an efficiency of 3 cd/A at 100 mA cm−2.
- Screen printable tungsten paste for EC layer low-cost deposition.

We present a large area trifunctional glass prototype combining a photo-electrochromic (PEC) device and an organic light-emitting diode (OLED), interfaced through a properly designed electronic control system. A 12×17 cm2 PEC glass-on-glass module was realized, containing four dyesensitized solar cells (DSSCs) and a central electrochromic (EC) section deposited on the same glass panel. All PEC layers are screen-printed, including the mesoporous electrochromic layer, obtained from a custommade tungsten paste. DSSCs show an efficiency of 2.4%, while the coloration efficiency of the EC section reaches a value of 40 cm2C−1 at 700 nm. A 10×8 cm2 transparent white OLED was also realized, designed and tailored in order to unbalance the emission of light, i.e. maximizing the bottom emission. The efficiency of large area OLED section reaches 8 cd A-1 in the operative conditions and without light outcoupling enhancement systems. The OLED device is clamped on the back of the PEC module and all sections are electrically connected to an external electronic control system. The energy collected by the DSSCs is stored in supercapacitors and used when requested, either applied to the EC section to produce a light shading effect in the daytime, or to the OLED for illumination at night.

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