Issue 39, 2024

Enhanced near-infrared detection in organic phototransistors via optimized donor–acceptor single crystals

Abstract

Organic single crystals are increasingly valued in organic phototransistors (OPTs) for their tunable properties and exceptional charge transport capabilities. However, their high exciton binding energy significantly limits dissociation efficiency. In this study, we successfully fabricated a high-performance near-infrared (NIR) CuPc OPT using PTCDA molecular doping, where CuPc acts as an electron donor matrix and PTCDA serves as an acceptor. Introducing PTCDA significantly enhances exciton dissociation, attributed to the numerous donor/acceptor interfacial barriers and the substantial energy level offset between CuPc and PTCDA. We found that a donor-to-acceptor ratio of 2 : 1 exhibits the optimal device performance, achieving a NIR responsivity of 500 A W−1 at 850 nm and a response speed of 135 μs, far outperforming the isolated CuPc single crystal device. These results highlight the potential of molecular doping strategies for fabricating high-performance OPTs and provide insights for designing and optimizing organic single-crystal semiconductors (OSCSs) for advanced optoelectronic applications.

Graphical abstract: Enhanced near-infrared detection in organic phototransistors via optimized donor–acceptor single crystals

Supplementary files

Article information

Article type
Paper
Submitted
01 ივლ 2024
Accepted
25 აგვ 2024
First published
10 სექ 2024

J. Mater. Chem. C, 2024,12, 16131-16137

Enhanced near-infrared detection in organic phototransistors via optimized donor–acceptor single crystals

F. Ling, Y. Zhang, Q. Du, X. Zheng, Q. Liu, W. Wang and S. Qin, J. Mater. Chem. C, 2024, 12, 16131 DOI: 10.1039/D4TC02783C

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