High-detectivity perovskite-based photodetector using a Zr-doped TiO cathode interlayer.
1Department of Chemical and Biomolecular Engineering, Sogang University Seoul Korea syoh@sogang.ac.kr +82-2-714-3890 +82-2-705-8681.
RSC Advances
|May 11, 2022
Summary
Adding zirconium (Zr) into titanium dioxide (TiO2) cathode interlayers significantly enhances organometallic halide perovskite photodetectors. This modification improves carrier extraction and reduces leakage current for better performance.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Organometallic halide perovskites are promising materials for photodetector applications.
- Efficient hole-blocking layers are crucial for optimizing photodetector performance by minimizing leakage current and improving carrier extraction.
- Titanium dioxide (TiO2) is a common material for cathode interlayers, but its performance can be further enhanced.
Purpose of the Study:
- To investigate the effect of incorporating zirconium (Zr) into TiO2 cathode interlayers for perovskite photodetectors.
- To evaluate the performance improvements in terms of carrier extraction, leakage current, and overall device characteristics.
- To assess the potential application of Zr-TiO2 interlayers in advanced optical and image sensors.
Main Methods:
- Fabrication of perovskite photodetectors with the device configuration ITO/PEDOT:PSS/CH3NH3PbI3Cl3-/PC60BM/Zr-TiO2/Al.
- Characterization of device performance using current-voltage (I-V) measurements.
- Analysis of impedance behaviors and dynamic characteristics to understand charge transport mechanisms.
- Evaluation of key performance metrics such as specific detectivity and bandwidth.
Main Results:
- The incorporation of Zr into TiO2 as a cathode interlayer effectively reduces leakage current in the perovskite photodetector.
- Zr-TiO2 enhances carrier extraction efficiency, leading to improved photodetector performance.
- The fabricated device exhibits a high specific detectivity of 1.37 × 10^13 Jones and a bandwidth of 2.1 MHz.
- Optimal performance was achieved at relatively low reverse bias and light intensity.
Conclusions:
- Zirconium-modified titanium dioxide (Zr-TiO2) serves as an effective hole-blocking layer in organometallic halide perovskite photodetectors.
- The enhanced carrier extraction and reduced leakage current contribute to superior device performance.
- These findings suggest that Zr-TiO2 interlayers are highly suitable for applications in image and optical sensors.
