Issue 16, 2024

A novel selenophene based non-fullerene acceptor for near-infrared organic photodetectors with ultra-low dark current

Abstract

Near-infrared organic photodetectors (OPDs) have great potential in many applications. However, the high dark current of many OPD devices tends to limit their specific detectivity and overall performance. Here we report a novel non-fullerene acceptor (IDSe) based on an alkylated indacenodiselenophene core, with extended light absorption up to 800 nm. When blended with the donor polymer PTQ10, we obtained OPD devices with an exceptionally low dark current density of 1.65 nA cm−2 at −2 V, high responsivity and specific detectivity exceeding 1012 Jones at 790 nm. The superior properties of PTQ10:IDSe devices are related to the higher and more balanced charge carrier mobility compared to the analogous thiophene based blend (PTQ10:IDIC). We also demonstrate large area PTQ10:IDSe based devices by doctor blade in air with a record low dark current of 1.2 × 10−7 A cm−2 under −2 V bias.

Graphical abstract: A novel selenophene based non-fullerene acceptor for near-infrared organic photodetectors with ultra-low dark current

Supplementary files

Article information

Article type
Paper
Submitted
18 Dec 2023
Accepted
08 Mar 2024
First published
22 Mar 2024
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2024,12, 5766-5775

A novel selenophene based non-fullerene acceptor for near-infrared organic photodetectors with ultra-low dark current

Z. Qiao, Q. He, A. D. Scaccabarozzi, J. Panidi, A. Marsh, Y. Han, P. Jacoutot, D. Nodari, T. Zhang, A. Way, A. J. P. White, T. D. Anthopoulos, W. C. Tsoi, A. A. Bakulin, M. Heeney, Z. Fei and N. Gasparini, J. Mater. Chem. C, 2024, 12, 5766 DOI: 10.1039/D3TC04678H

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