Anomalous Photocurrent Reversal for the Same Polarization Direction in van der Waals Ferroelectric Cu⁢In⁢P2⁢S6

Yinxin Bai; Wei Hao; Yanghe Wang; Junjiang Tian; Chuanshou Wang; Yunlin Lei; Yihao Yang; Xiaodong Yao; Qihang Liu; Changjian Li; Mingqiang Gu; Junling WANG

doi:10.1103/PRXEnergy.3.023004

Anomalous Photocurrent Reversal for the Same Polarization Direction in van der Waals Ferroelectric Cu⁢In⁢P_2⁢S₆

Yinxin Bai, Wei Hao, Yanghe Wang, Junjiang Tian, Chuanshou Wang, Yunlin Lei, Yihao Yang, Xiaodong Yao, Qihang Liu, Changjian Li^*, Mingqiang Gu^*, Junling WANG^*

^*Corresponding author for this work

Department of Physics

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

6 Citations (Scopus)

26 Downloads (CityUHK Scholars)

Abstract

The bulk photovoltaic effect (BPVE) in ferroelectric materials has attracted much attention due to its above-band-gap photovoltage and switchable photoresponse. However, the exact correlation between the photocurrent and spontaneous polarization remains unclear. Here, we report an anomalous reversal of the photocurrent, even for the same polarization direction, in van der Waals (vdW) ferroelectric Cu⁢In⁢P₂⁢S₆ (CIPS). Careful analysis reveals that the relocation of Cu ions into the vdW gap upon thickness reduction causes the current reversal, even though it does not change the polarization direction. By combining theoretical and experimental studies, we show clearly the decoupling of the BPVE photocurrent and electric polarization. This discovery significantly improves our understanding of the BPVE and demonstrates yet another example of the lattice dimensionality effect in vdW ferroelectrics.

Original language	English
Article number	023004
Number of pages	6
Journal	PRX Energy
Volume	3
Issue number	2
Online published	21 May 2024
DOIs	https://doi.org/10.1103/PRXEnergy.3.023004
Publication status	Published - 2024

Funding

We acknowledge support from the Guangdong Innovative and Entrepreneurial Research Team Program (Grant No. 2021ZT09C296), the National Natural Science Foundation of China (Grant No. 12074164), the National Key Research and Development of China (No. 2022YFA1402903), and the Guangdong Provincial Key Laboratory Program (2021B1212040001) from the Department of Science and Technology of Guangdong Province. M.G. was supported by the Natural Science Foundation of Guangdong Province (2021A1515110389) and the Science Technology and Innovation Commission of Shenzhen Municipality (JCYJ20210324104812034). C.L. acknowledges financial support from the National Natural Science Foundation of China (52172115); the Natural Science Foundation of Guangdong Province (2022A1515010762); and the Guangdong Provincial Department of Education Innovation Team Program (2021KCXTD012).

Publisher's Copyright Statement

This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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title = "Anomalous Photocurrent Reversal for the Same Polarization Direction in van der Waals Ferroelectric Cu⁢In⁢P2⁢S6",

abstract = "The bulk photovoltaic effect (BPVE) in ferroelectric materials has attracted much attention due to its above-band-gap photovoltage and switchable photoresponse. However, the exact correlation between the photocurrent and spontaneous polarization remains unclear. Here, we report an anomalous reversal of the photocurrent, even for the same polarization direction, in van der Waals (vdW) ferroelectric Cu⁢In⁢P2⁢S6 (CIPS). Careful analysis reveals that the relocation of Cu ions into the vdW gap upon thickness reduction causes the current reversal, even though it does not change the polarization direction. By combining theoretical and experimental studies, we show clearly the decoupling of the BPVE photocurrent and electric polarization. This discovery significantly improves our understanding of the BPVE and demonstrates yet another example of the lattice dimensionality effect in vdW ferroelectrics.",

author = "Yinxin Bai and Wei Hao and Yanghe Wang and Junjiang Tian and Chuanshou Wang and Yunlin Lei and Yihao Yang and Xiaodong Yao and Qihang Liu and Changjian Li and Mingqiang Gu and Junling WANG",

year = "2024",

doi = "10.1103/PRXEnergy.3.023004",

language = "English",

volume = "3",

number = "2",

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TY - JOUR

T1 - Anomalous Photocurrent Reversal for the Same Polarization Direction in van der Waals Ferroelectric Cu⁢In⁢P2⁢S6

AU - Bai, Yinxin

AU - Hao, Wei

AU - Wang, Yanghe

AU - Tian, Junjiang

AU - Wang, Chuanshou

AU - Lei, Yunlin

AU - Yang, Yihao

AU - Yao, Xiaodong

AU - Liu, Qihang

AU - Li, Changjian

AU - Gu, Mingqiang

AU - WANG, Junling

PY - 2024

Y1 - 2024

N2 - The bulk photovoltaic effect (BPVE) in ferroelectric materials has attracted much attention due to its above-band-gap photovoltage and switchable photoresponse. However, the exact correlation between the photocurrent and spontaneous polarization remains unclear. Here, we report an anomalous reversal of the photocurrent, even for the same polarization direction, in van der Waals (vdW) ferroelectric Cu⁢In⁢P2⁢S6 (CIPS). Careful analysis reveals that the relocation of Cu ions into the vdW gap upon thickness reduction causes the current reversal, even though it does not change the polarization direction. By combining theoretical and experimental studies, we show clearly the decoupling of the BPVE photocurrent and electric polarization. This discovery significantly improves our understanding of the BPVE and demonstrates yet another example of the lattice dimensionality effect in vdW ferroelectrics.

AB - The bulk photovoltaic effect (BPVE) in ferroelectric materials has attracted much attention due to its above-band-gap photovoltage and switchable photoresponse. However, the exact correlation between the photocurrent and spontaneous polarization remains unclear. Here, we report an anomalous reversal of the photocurrent, even for the same polarization direction, in van der Waals (vdW) ferroelectric Cu⁢In⁢P2⁢S6 (CIPS). Careful analysis reveals that the relocation of Cu ions into the vdW gap upon thickness reduction causes the current reversal, even though it does not change the polarization direction. By combining theoretical and experimental studies, we show clearly the decoupling of the BPVE photocurrent and electric polarization. This discovery significantly improves our understanding of the BPVE and demonstrates yet another example of the lattice dimensionality effect in vdW ferroelectrics.

U2 - 10.1103/PRXEnergy.3.023004

DO - 10.1103/PRXEnergy.3.023004

M3 - RGC 21 - Publication in refereed journal

VL - 3

JO - PRX Energy

JF - PRX Energy

IS - 2

M1 - 023004

ER -