Meng, X and Du, Y and Wu, W and Joseph, NB and Deng, X and Wang, J and Ma, J and Shi, Z and Liu, B and Ma, Y and Yue, F and Zhong, N and Xiang, P-H and Zhang, C and Duan, C-G and Narayan, A and Sun, Z and Chu, J and Yuan, X (2023) Giant Superlinear Power Dependence of Photocurrent Based on Layered Ta2NiS5 Photodetector. In: Advanced Science, 10 (20).
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Abstract
Photodetector based on two-dimensional (2D) materials is an ongoing quest in optoelectronics. 2D photodetectors are generally efficient at low illuminating power but suffer severe recombination processes at high power, which results in the sublinear power-dependent photoresponse and lower optoelectronic efficiency. The desirable superlinear photocurrent is mostly achieved by sophisticated 2D heterostructures or device arrays, while 2D materials rarely show intrinsic superlinear photoresponse. This work reports the giant superlinear power dependence of photocurrent based on multilayer Ta2NiS5. While the fabricated photodetector exhibits good sensitivity (3.1 mS W�1per �) and fast photoresponse (31 µs), the bias-, polarization-, and spatial-resolved measurements point to an intrinsic photoconductive mechanism. By increasing the incident power density from 1.5 to 200 µW µm�2, the photocurrent power dependence varies from sublinear to superlinear. At higher illuminating conditions, prominent superlinearity is observed with a giant power exponent of γ = 1.5. The unusual photoresponse can be explained by a two-recombination-center model where density of states of the recombination centers (RC) effectively closes all recombination channels. The photodetector is integrated into camera for taking photos with enhanced contrast due to superlinearity. This work provides an effective route to enable higher optoelectronic efficiency at extreme conditions. © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.
| Item Type: | Journal Article |
|---|---|
| Publication: | Advanced Science |
| Publisher: | John Wiley and Sons Inc |
| Additional Information: | The copyright for this article belongs to Authors. |
| Keywords: | Efficiency; Inorganic compounds; Nickel compounds; Niobium compounds; Photoconductivity; Photocurrents; Photodetectors; Sulfur compounds; Tantalum compounds, High power sensors; Layered ternary chalcogenides; Photoconductive detectors; Photoresponses; Power; Power-dependences; Sublinear; Superlinear; Superlinear photoresponse; Ternary chalcogenides, Image enhancement |
| Department/Centre: | Division of Chemical Sciences > Solid State & Structural Chemistry Unit |
| Date Deposited: | 22 Aug 2024 06:20 |
| Last Modified: | 22 Aug 2024 06:20 |
| URI: | http://eprints.iisc.ac.in/id/eprint/85556 |
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