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Single-pixel imaging system based on a high performance S-CYHEAPbI₃ self-powered detector.

Xiaoting Wang, Cuili Cui, Long Yuan

|July 1, 2025

Summary

We fabricated ferroelectric S-CYHEAPbI3 polycrystalline films for photodetectors (PDs). These self-powered PDs show excellent optoelectronic performance, enabling continuous imaging without external power.

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Area of Science:

Materials Science
Optoelectronics
Solid-State Physics

Background:

Ferroelectric materials offer unique properties for optoelectronic applications.
Developing high-performance photodetectors (PDs) is crucial for advanced imaging systems.
Polycrystalline films present challenges in carrier transport due to domain barriers.

Purpose of the Study:

To fabricate ferroelectric S-CYHEAPbI3 polycrystalline films for photodetector applications.
To investigate the optoelectronic performance and self-powered characteristics of the fabricated PDs.
To understand the carrier transport mechanisms within the ferroelectric films.

Main Methods:

Fabrication of ITO/S-CYHEAPbI3/Ag structured ferroelectric polycrystalline films.
Characterization of optoelectronic performance, including on-off ratio, responsivity (R), and detectivity.
Frequency-modulation and transient absorption tests to analyze photo-generated carrier behavior.

Main Results:

The PDs demonstrated a high on-off ratio (1.87 × 10^4) and detectivity (5.42 × 10^12 Jones) at 0.3 V.
Self-powered operation showed a responsivity of 0.42 A W^-1 and detectivity of 1.15 × 10^12 Jones.
Analysis revealed a carrier transport barrier of ~0.02 eV in the S-CYHEAPbI3 films.

Conclusions:

The fabricated ferroelectric S-CYHEAPbI3 films are suitable for high-performance photodetectors.
The self-powered capability and photostability enable applications in power-free imaging.
This work presents a new route for developing advanced optoelectronic devices.