Issue 48, 2023

Vacuum-deposited organic photodetectors utilizing non-fullerene acceptors for enhanced detectivity in the green visible light spectrum

Abstract

Boron subphthalocyanine (SubPc) is a small molecule active material that absorbs visible light efficiently at wavelengths ranging from 500 to 600 nm. Recent studies have demonstrated that blending SubPc and C60 (fullerene) as the active layer in organic photodetectors (OPDs) results in a high dark current and decreases detectivity. Moreover, N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)benzidine (NPB) can be employed as a blocking layer and as a donor on the active layer. In this study, the performance of OPDs is investigated using non-fullerene (NPB : SubPc) and fullerene (SubPc : C60) active layers. The OPD utilizing a non-fullerene-based device (NPB : SubPc) with a ratio of 1 : 3 exhibits high performance across various parameters. It demonstrated a low dark current density of 1.32 × 10−9 A cm−2, an external quantum efficiency (EQE) of 51.85%, a responsivity of 0.22 A W−1, and a high detectivity of 1.07 × 1013 Jones at a wavelength of 530 nm. Moreover, the device showed a linear dynamic range (LDR) of 109.29 dB, a frequency cut-off of 263.04 kHz, and a transient photovoltage in formed rise and fall times of 2.74 μs and 1.51 μs, respectively. These findings suggest that the developed device could be suitable for future fingerprint recognition, owing to its ability to detect visible green light.

Graphical abstract: Vacuum-deposited organic photodetectors utilizing non-fullerene acceptors for enhanced detectivity in the green visible light spectrum

Supplementary files

Article information

Article type
Paper
Submitted
24 Jun 2023
Accepted
14 Sep 2023
First published
04 Oct 2023

J. Mater. Chem. C, 2023,11, 16972-16981

Vacuum-deposited organic photodetectors utilizing non-fullerene acceptors for enhanced detectivity in the green visible light spectrum

M. R. A. Septian, R. Estrada, C. Lee, C. Chen, J. Iskandar, N. R. A. Amin, A. K. Akbar, K. Uma and S. Liu, J. Mater. Chem. C, 2023, 11, 16972 DOI: 10.1039/D3TC02214E

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