Perovskite Nanocrystal—Carbon Nanotube Heterojunction Behaves as Optical Synapse with 1000s-of-Seconds Persistent Photoconductivity
For some applications, metal halide perovskite materials have problematically high-ion migration properties. However, that same property can also be exploited as a beneficial feature for certain technologies.
We demonstrate a phototransistor composed of semiconducting carbon nanotubes (CNTs) decorated with perovskite nanocrystals, which show long-lived photoinduced memory effects.
Significance and Impact
Solid-state optoelectronic memory technologies and optical switches could replace electrically stimulated resistive switches in photonic integrated circuits and dynamically configurable neural networks for energy-efficient, brain-inspired (neuromorphic) computing and information processing.
- Constructed a nano-heterojunction from perovskite nanocrystals decorated onto carbon nanotube arrays.
- Showed, upon light excitation, a dramatic change in photoconductivity for 1000s of seconds after excitation.
- Proved process to be driven by ion migration and optically written and erased easily with voltage pulses.