Hybrid Perovskite Terahertz Photoconductive Antenna

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Physics

Background:

• Hybrid organic-inorganic perovskites are well-studied for photovoltaics but largely unexplored for terahertz (THz) applications.
• Their tunable optoelectronic properties and low cost make them attractive for THz device development.
• Existing THz emitter technologies often rely on more expensive or less versatile materials.

Purpose of the Study:

• To experimentally demonstrate hybrid perovskites as a viable material for photoconductive terahertz emitters.
• To investigate the THz emission properties of solution-processed polycrystalline perovskite films.
• To determine carrier dynamics in halide perovskites using THz emission.

Main Methods:

• Fabrication and characterization of large-aperture photoconductive antennas using methylammonium lead halide perovskites (MAPbI3 and MAPbBr3).
• Excitation of perovskite films above and below the bandgap.
• Measurement of THz emission scaling with applied bias field and optical excitation fluence.
• Utilizing ultrafast time-resolved spectroscopy and THz emission experiments.

Main Results:

• Successful demonstration of THz emission from hybrid perovskite photoconductive antennas.
• Analysis of THz emission dependence on excitation conditions and applied bias.
• Non-invasive determination of room-temperature carrier lifetime and mobility in halide perovskites.
• Polycrystalline perovskite films show potential for scalable THz device fabrication.

Conclusions:

• Hybrid perovskites are suitable for developing scalable, cost-effective photoconductive terahertz emitters.
• These materials offer a competitive alternative to conventional semiconductors in THz technology.
• The study provides a novel method for characterizing carrier dynamics in perovskites.