Enhancing Small-Molecule Organic Photodetector Performance for Reflectance-Mode Photoplethysmography Sensor Applications

Anubha Bilgaiyan, Fahed Elsamnah, Hiroshi Ishidai, Chang Hoon Shim, Muhamad Affiq Bin Misran, Chihaya Adachi, Reiji Hattori

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Organic photodetector performance for enhancing the sensing abilities of an organic photoplethysmography sensor was investigated. The optimized organic photodetector with an anode interlayer and a cathode interlayer showed a reverse dark current density of 22 nA cm-2 at -2 V and an external quantum efficiency of 53.3% at 0 V. This organic photodetector was fabricated monolithically with an organic light-emitting diode on a glass substrate to achieve a reflectance-mode photoplethysmography sensor, demonstrating the impact of organic photodetector device performance on the measured photoplethysmography signal for sensing applications. Furthermore, we estimated the optimal sensor design for circular geometry in terms of device area and distance between the organic light-emitting diode and organic photodetector to maximize the signal-to-noise ratio and lower the power consumption of organic photoplethysmography sensor devices. For the most favorable photoplethysmography sensor design, a signal strength of 130 mV with 600 μW power consumption was measured.

Original languageEnglish
Pages (from-to)1280-1288
Number of pages9
JournalACS Applied Electronic Materials
Issue number5
Publication statusPublished - May 26 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Electrochemistry


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