Energy Recoverable OLED

1
Energy Recoverable OLED

• A metal layer should be deposited on TFT to
  prevent TFT from being disturbed by the light
  emitted by OLED, but it will reflect the sun
  light thus decreases the contrast of the display.
• Solar Cell was used between TFT and OLED to
  absorb both the sun light and the emitted light
  of OLED to solved the contrast problem and to
  achieve the energy-recoverable OLED.

2
Schematic Diagram of the Energy-Recoverable OLED
3
Amorphous Silicon Germanium Alloys

• How to design a suitable solar cell becomes
• an important issue. (a trade-off situation)
• Alloying a-SiH with germanium, the optical
• gap can be decreased.
• However, the photoelectric characteristic
• of the solar cell will become degrade.
• Therefore, the Ge fraction has an optimum value

4
Conclusions

• The performance of two devices, including a TFT
  with a a-SiH solar cell on top and a TFT with a
  OLED on top, were studied and a detailed
  fabrication processes of the energy- recoverable
  OLED were shown.
• The a-Si1-xGe xH films fabricated with different
  Ge fraction. After analyzing the optical gap and
  the FTIR specta, the optimum x, 0.25, is
  determined.