Ambipolar solution-processed hybrid perovskite phototransistors

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Physics

Background:

• Organolead halide perovskites are key materials in emerging hybrid solid-state solar cells due to their notable physical properties.
• Hybrid perovskite films are being explored for their potential in advanced electronic and optoelectronic devices.

Purpose of the Study:

• To investigate the carrier transport properties of hybrid perovskite films in phototransistors.
• To provide direct evidence of the ambipolar characteristics and performance of perovskite-based phototransistors.

Main Methods:

• Fabrication of phototransistors using hybrid perovskite films.
• Measurement of field-effect mobilities for holes and electrons in triiodide and mixed-halide perovskites.
• Characterization of photoresponsivity and photoresponse speed.

Main Results:

• Hybrid perovskite films exhibit superior ambipolar carrier transport properties.
• Field-effect mobilities reached 1.24 cm(2) V(-1) s(-1) for holes and 1.01 cm(2) V(-1) s(-1) for electrons in mixed-halide perovskites.
• Devices demonstrated high photoresponsivity (320 A/W) and ultrafast photoresponse (<10 μs).

Conclusions:

• Hybrid perovskites possess excellent carrier transport properties suitable for phototransistors.
• The demonstrated performance highlights their promise for high-performance photoelectronic applications.
• Solution-based processing further enhances their potential for commercial viability.