Enhanced sub-1 eV detection in organic photodetectors through tuning polymer energetics and microstructure

Author:

Jacoutot Polina1ORCID,Scaccabarozzi Alberto D.2ORCID,Nodari Davide1,Panidi Julianna1ORCID,Qiao Zhuoran1ORCID,Schiza Andriana3ORCID,Nega Alkmini D.4ORCID,Dimitrakopoulou-Strauss Antonia4,Gregoriou Vasilis G.35,Heeney Martin16ORCID,Chochos Christos L.35ORCID,Bakulin Artem A.1,Gasparini Nicola1ORCID

Affiliation:

1. Department of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, UK.

2. Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia, via Raffaele Rubattino 81, Milano 20134, Italy.

3. Institute of Chemical Biology, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece.

4. Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, 69120 Heidelberg, Germany.

5. Advent Technologies SA, Stadiou Street, Platani, Rio, Patras 26504, Greece.

6. King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Thuwal 23955, Saudi Arabia.

Abstract

One of the key challenges facing organic photodiodes (OPDs) is increasing the detection into the infrared region. Organic semiconductor polymers provide a platform for tuning the bandgap and optoelectronic response to go beyond the traditional 1000-nanometer benchmark. In this work, we present a near-infrared (NIR) polymer with absorption up to 1500 nanometers. The polymer-based OPD delivers a high specific detectivity D * of 1.03 × 10 10 Jones (−2 volts) at 1200 nanometers and a dark current J d of just 2.3 × 10 −6 ampere per square centimeter at −2 volts. We demonstrate a strong improvement of all OPD metrics in the NIR region compared to previously reported NIR OPD due to the enhanced crystallinity and optimized energy alignment, which leads to reduced charge recombination. The high D * value in the 1100-to-1300-nanometer region is particularly promising for biosensing applications. We demonstrate the OPD as a pulse oximeter under NIR illumination, delivering heart rate and blood oxygen saturation readings in real time without signal amplification.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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