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Terahertz Modulation and Ultrafast Characteristic of Two-Dimensional Lead Halide Perovskites
Hongyuan Liu1, Xunjun He2, Jie Ren2
1School of Computer Science, Harbin University of Science and Technology, Harbin 150080, China.
Nanomaterials (Basel, Switzerland)
|October 27, 2022
Summary
Two-dimensional halide perovskites exhibit promising ultrafast terahertz responses, with relaxation times around 3 ps. This study reveals their potential for high-performance tunable terahertz devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Optoelectronics
Background:
- Two-dimensional (2D) halide perovskites are recognized for their excellent optoelectronic properties and stability.
- Their terahertz (THz) and ultrafast response characteristics remain underexplored, hindering the development of tunable THz devices.
Purpose of the Study:
- To investigate the THz and ultrafast characteristics of 2D R-P type (PEA)2(MA)2Pb3I10 perovskite films.
- To analyze photogenerated carrier recombination mechanisms and photoconductivity changes.
Main Methods:
- Fabrication of 2D perovskite films via one-step spin-coating.
- Utilizing a homemade ultrafast optical pump-THz probe (OPTP) system.
- Applying a three-exponential function and the Drude-Smith model for data analysis.
Main Results:
- The 2D perovskite film demonstrated an intensity modulation depth of approximately 10% and an ultrafast relaxation time of about 3 ps.
- Three distinct carrier decay channels were identified: free carrier, exciton, and trap-assisted recombination.
- A maximum photoconductivity change (Δσ) of 600 S/m was observed at zero pump-probe delay time.
Conclusions:
- The 2D (PEA)2(MA)2Pb3I10 perovskite film exhibits significant potential for applications in high-performance, tunable, and ultrafast THz devices.
- Understanding the ultrafast carrier dynamics is crucial for optimizing these materials in optoelectronic applications.
