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Two-dimensional Ruddlesden-Popper perovskite microcrystal photodetectors with high detectivity for ultra-weak light
Yunuan Wang1, Yanping Ma1, Jianxiang Liu1
1Institute of Automation, Qilu University of Technology (Shandong Academy of Sciences) Jinan 250014 P. R. China yunuanwang@163.com.
RSC Advances
|March 13, 2026
Summary
High-quality two-dimensional (2D) perovskite single crystals were developed for sensitive light detection. These novel photodetectors show excellent performance under ultra-weak ultraviolet illumination, advancing weak light detection capabilities.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Two-dimensional (2D) organic-inorganic metal halide perovskites are promising for light detection due to their optical and semiconductor properties.
- Existing research on 2D perovskites for weak light detection is limited, necessitating improvements in detection limits.
- Enhanced stability in humidity and light makes 2D perovskites attractive for photodetector applications.
Purpose of the Study:
- To prepare high-quality 2D perovskite single crystals with low defect density for enhanced photodetection.
- To investigate the performance of lateral photodetectors based on these 2D perovskite single crystals under ultra-weak illumination.
- To demonstrate the potential of 2D perovskites for achieving ultra-low detection limits in light sensing.
Main Methods:
- Synthesis of high-quality (C6H5CH2CH2NH3, PEA)2PbBr4 perovskite single crystals.
- Fabrication of lateral photodetectors utilizing the synthesized perovskite single crystals.
- Characterization of device performance, including photoresponse, dark current, responsivity, gain, and specific detectivity under varying illumination conditions.
Main Results:
- The fabricated photodetectors exhibited stable photoresponse under ultra-weak ultraviolet light.
- A very low dark current of 4.75 × 10^-11 A was achieved, enabling a low-noise detection baseline.
- The device demonstrated high responsivity (19.23 A W^-1), gain (58.80), and specific detectivity (1.22 × 10^14 Jones) even at low optical power density (2.47 nW cm^-2).
Conclusions:
- The developed 2D perovskite single crystals are highly suitable for ultra-weak light photodetection.
- The low defect density and minimal dark current are crucial for achieving high detectivity in weak light conditions.
- This study highlights the significant potential of 2D perovskite materials in advancing sensitive light detection technologies.
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