Organic Photodiodes

Organic photo-sensors can be developed for applications that could not be realized with conventional inorganic photo-sensors.

Features of OPD Technology

Organic photo- sensor has the following advantages over conventional inorganic photo-sensors:

  • Light weight
  • Flexibility
  • Size (large area sensors can be made)
  • Easy integration with other electronics components

Applications

Organic photo-sensors can be formed not only on glass or inorganic substrates but also on plastic substrates, so lightweight, thin films, flexible and large area sensors can be made, and can be easy combined with other printed electronics technologies.
Therefore, it can be expected to be applied to applications such as pulse oximeter, digital X-ray sensor, proximity (distance) sensor, fingerprint authentication sensor, vein authentication, iris authentication, night vision.

Example Applications:

Pulse Oximeter

  • Differential signal from two OLEDs detected by OPD
  • Heart rate and oxygenation level of the blood is calculated
  • OLED and OPD can be integrated on the same substrate

Example Application: OPD Proximity Sensor Switching OLEDs

Features of OPD materials

Our organic photo-sensor material has absorption in the visible to near infrared region, so it can be used in various photo-sensing applications.
Organic photo-sensors using our material can achieve high external quantum yield (EQE) and low dark current.

Organic vs Silicon Photodiode Device Performance

Metric OPD Si-PD
EQE ~ 65% (-2 bias)

30% at 400nm rising
to 85% at 800nm

Wavelength range

400 - 950nm

400 - 1100nm
(typical)

Responsivity (R) > 0.15A/W (400nm)
> 0.29A/W (800nm)

Approx. Linear from
- 0.15 A/W at 400nm
- 0.60 A/W at 950nm

Dark current
(at -0.5V)

< 1nA/cm2 10 - 100pA/cm2
(-5V)

Linear Dynamic
Range (LDR)

72dB 120dB

Response time
(rise/fall time)

5μs (10mm2)

50 - 100ns (100mm2)
(area dependent)

CONTACT

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