A non-volatile "programmable" transparent multilevel ultra-violet perovskite photodetector
Mohit Kumar1, Hong-Sik Kim, Dae Young Park
1Photoelectric and Energy Device Application Lab (PEDAL), Multidisciplinary Core Institute for Future Energies (MCIFE), Incheon National University, 119 Academy Rd. Yeonsu, Incheon, 22012, Republic of Korea. joonkim@incheon.ac.kr.
Nanoscale
|June 8, 2018
Summary
Researchers developed a programmable ultraviolet photodetector using perovskite materials. This device offers multiple operating levels and stable performance under ambient conditions, advancing transparent optoelectronics.
Area of Science:
- Materials Science
- Optoelectronics
- Semiconductor Physics
Background:
- Perovskite materials possess excellent physical properties, making them promising for next-generation optoelectronics.
- A key challenge is their instability in ambient atmosphere and under UV illumination, hindering the development of stable UV photodetectors.
Purpose of the Study:
- To design and demonstrate a high-performance, visible-light transparent, and air-stable ultraviolet photodetector based on perovskite materials.
- To leverage the inherent hysteresis in perovskite current-voltage characteristics for novel device functionality.
Main Methods:
- Fabrication of a (C4H9NH3)2PbBr4-based ultraviolet photodetector.
- Utilizing the current-voltage hysteresis loop for programmable multi-level operation.
- Characterization of optoelectronic performance, including response time, responsivity, detectivity, and stability.
Main Results:
- Demonstrated a programmable ultraviolet photodetector with multiple operating levels, switchable via electrical pulses.
- Achieved a fast response time of ~2 ms, responsivity of ~32 mA W⁻¹, and detectivity of 8.5 × 10⁸ Jones at a low working voltage of 0.5 V.
- Confirmed long-term stability and retained optoelectronic performance under ambient conditions.
Conclusions:
- The developed perovskite photodetector overcomes conventional limitations by incorporating programmable features.
- This breakthrough enables the creation of multipurpose transparent optoelectronic devices with tunable functionalities.
- The study opens new avenues for advanced UV detection and transparent electronic applications.
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