Enhanced Sub-1 eV detection in organic photodetectors through tuning polymer energetics and microstructure
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
One of the key challenges facing organic photodiodes (OPD) is increasing the detection into the IR region. Organic semiconductor polymers provide a platform for tuning the bandgap and optoelectronic response to go beyond the traditional 1000 nm benchmark. In this work, we present a NIR polymer with absorption up to 1500 nm. The polymer-based OPD delivers a high specific detectivity D* of 1.03×1010 Jones (-2 V) at 1200 nm and a dark current Jd of just 2.3×10-6 A cm-2 at -2V. 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 1100-1300 nm 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.
Date Issued
2023-06
Date Acceptance
2023-05-03
Citation
Science Advances, 2023, 9 (23), pp.1-9
ISSN
2375-2548
Publisher
American Association for the Advancement of Science
Start Page
1
End Page
9
Journal / Book Title
Science Advances
Volume
9
Issue
23
Copyright Statement
Copyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/
License URL
Identifier
https://www.science.org/doi/10.1126/sciadv.adh2694
Publication Status
Published
Article Number
eadh269
Date Publish Online
2023-06-07