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Updated: Jun 2, 2025

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
Published on: August 28, 2018
In-Plane Bulk Photovoltaic Effect in a MoSe2/NbOI2 Heterojunction for Efficient Polarization-Sensitive Self-Powered
Xiong Huang1, Qi Wang2, Kejian Song1
1Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, P. R. China.
This study enhances self-powered photodetectors by creating a novel heterojunction. The new design significantly boosts the bulk photovoltaic effect, leading to improved responsivity and polarization sensitivity.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) ferroelectric materials offer potential for self-powered photodetectors via the bulk photovoltaic effect.
- Current limitations include weak photoresponse due to low transition strength and wide band gaps.
Purpose of the Study:
- To develop a van der Waals heterojunction for enhanced self-powered photodetector performance.
- To investigate charge transfer dynamics and ferroelectric domain modulation for improved bulk photovoltaic effect.
Main Methods:
- Fabrication of a van der Waals heterojunction combining NbOI2 (in-plane polarization) and MoSe2 (light absorption).
- Ultrafast spectroscopy to observe charge transfer dynamics.
- Application of electric field poling to modulate ferroelectric domains.
Main Results:
- Observed ultrafast hole transfer (0.4 ps) from MoSe2 to NbOI2 and electron transfer (3.8 ps) in the reverse direction.
- Demonstrated enhanced bulk photovoltaic effect through ferroelectric domain modulation.
- Achieved high responsivity (101.3 mA/W) at 0 V bias and excellent polarization sensitivity (∼7.58).
Conclusions:
- The engineered heterojunction significantly improves charge dissociation and extraction efficiency.
- Ferroelectric domain engineering is a viable strategy for boosting bulk photovoltaic effects in 2D materials.
- This work paves the way for advanced self-powered optoelectronic devices.
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