In the new generation of photodetector devices, external power supply has always been a key bottleneck restricting system performance and device miniaturization. Therefore, self-driven photoelectric detection without a power supply module has broad application prospects in next-generation portable, energy-saving photoelectric devices. Compared with traditional pn junction / heterojunction semiconductor materials, ferroelectric materials provide a simple and effective way to realize self-driven photoelectric detection. Under light radiation, photo-generated electron-hole pairs are generated inside the single-phase ferroelectric material, photo-generated carriers are separated under the action of the ferroelectric spontaneous polarization electric field, and signal voltage and current are generated in the external circuit, thereby realizing the detection of light. However, traditional inorganic ferroelectric materials, due to their larger band gap and weaker semiconductor characteristics, have limited their application in optoelectronic devices. In recent years, organic-inorganic hybrid perovskite ferroelectric materials, due to their large spontaneous polarization and excellent semiconductor characteristics, have shown great potential in self-driven photoelectric detection.
The team of Luo Junhua, a researcher of inorganic optoelectronic functional crystal materials at the State Key Laboratory of Structural Chemistry at the Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, has been sponsored by the National Natural Science Foundation of China, the National Outstanding Youth Fund, the Strategic Pilot Project of the Chinese Academy of Sciences, and the National Natural Science Foundation of China Outstanding Youth Fund. Next, for the first time, a two-dimensional hybrid perovskite ferroelectric (CH3CH2NH3) 2 (CH3NH3) 2Pb3Br10 was used to realize self-driven photoelectric detection. The study found that the material exhibits excellent photoelectric detection performance under the driving of ferroelectric polarization without external power supply. The photocurrent density can reach ~ 4.1 μA / cm2, the current switching ratio can reach 106, and the extremely fast photoelectric response rate. In addition, the ferroelectric material also exhibits photoelectric detection performance with adjustable electric field. This work not only provides a solution for the subsequent exploration of multifunctional ferroelectric materials, but also lays a foundation for the application of inorganic organic hybrid ferroelectric materials in smart optoelectronic devices. Related research results were recently published in the form of communication in "Germany In Applied Chemistry (Angew. Chem. Int. Ed.2019, DOI: 10.1002 / anie.201907660), associate researcher Liu Xitao is the first author of the paper.
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