Highly Sensitive and Tunable Self-Powered UV Photodetectors Driven Jointly by p-n Junction and Ferroelectric Polarization

ACS Applied Materials & Interfaces
Jian ChenYunbin He

Abstract

Ferroelectric (FE) materials are thought to be promising materials for self-powered ultraviolet (UV) photodetector applications because of their photovoltaic effects. However, FE-based photodetectors exhibited poor performance because of the weak photovoltaic effect of FE depolarization field (Edp) on the separation of photo-generated carriers. In this work, self-powered photodetectors based on both Edp and built-in electric field at the p-n junction (Ep-n) were designed to obtain enhanced device performance. A NiO/Pb0.95La0.05Zr0.54Ti0.46O3 (PLZT) heterojunction-based device is constructed to take advantage of energy level alignments that favor electron extraction. The device exhibits a tunable performance upon varying the polarization direction of PLZT. The NiO/PLZT heterojunction-based device with the PLZT layer in the poling down state shows a higher responsivity [R = (1.8 ± 0.12) × 10-4 A/W] and detectivity [D* = (3.69 ± 0.2) × 109 Jones], a faster response speed (τr = 0.34 ± 0.03 s, τd = 0.36 ± 0.02 s), and a lower dark current [Idark = (1.3 ± 0.19) × 10-12 A] under zero bias than the PLZT-based device because of the synergistic effects of Edp and Ep-n. Moreover, under weak-light illumination (0.1 mW/cm2), it exhibits eve...Continue Reading

References

Jan 12, 2010·Nature Nanotechnology·S Y YangR Ramesh
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Oct 8, 2015·Scientific Reports·Ryotaro InoueMasaru Miyayama
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May 26, 2018·Nature Communications·Sung-Joo KwonTae-Woo Lee
Mar 9, 2019·Nano-micro Letters·Kun ZhaoYa Yang

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Citations

Jun 18, 2021·ACS Applied Materials & Interfaces·Lifa NiDong Xiang
Nov 2, 2021·Advanced Science·Kui YaoYasmin Mohamed Yousry

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