首页|2D Ti3C2 nanoflakes anchored ZnO photodetector with substantially improved deep-ultraviolet photoresponse and on/off ratio
2D Ti3C2 nanoflakes anchored ZnO photodetector with substantially improved deep-ultraviolet photoresponse and on/off ratio
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NSTL
Elsevier
? 2022 Elsevier B.V.Deep ultraviolet photodetectors (deep-UV PDs) are promising for multiple applications due to their high detecting accuracy and sensitivity in the absence of background sunlight disturbance. By alloying, the bandgap of ZnO can be extended for deep-UV optoelectronics. However, it is limited by the solubility and the crystal quality degradation for a high-component alloy, which hinders the practical applications. In this work, we simply use the 2D Ti3C2 nanoflakes to anchor on ZnO surface to enhance the deep-UV band absorption. Moreover, van der Waals heterojunctions formed at the dispersed Ti3C2/ZnO interfaces create surface depletion and passivation, which suppresses the dark current and enhances the photocurrent simultaneously. As a result, the Ti3C2 nanoflakes anchored ZnO PD shows enhanced photoresponse in the entire UV region. Particularly, in the deep-UV range this enhancement is much more significant, with a peak light to dark ratio, EQE, responsivity and detectivity of 1.64 × 104, 128.3 mA/W, 66.3% and 5.7 × 1011 Jones respectively achieved at 240 nm light illumination, which is enhanced by 284, 72, 74 and 55 times respectively compared to the pristine ZnO PD. This work provides a newly non-alloyed strategy to broaden ZnO-based deep-UV, high-performance photodetection applications.
Deep ultravioletDetectivityON/OFF ratioPhotodetectorTi3C2ZnO
Song W.、Liang Z.、Guo Y.、He X.、Luo X.、Liu Q.、Sun Y.、Li S.
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College of Applied Physics and Materials Wuyi University
China Electronic Product Reliability and Environmental Testing Research Institute CEPREI
Guangdong Engineering Research Center of Optoelectronic Functional Materials and Devices Institute of Semiconductors South China Normal University
NSTL
Elsevier
