[ Instrument Network Instrument Development ] In the new generation of photodetector components, external power supply has always been a key bottleneck restricting system performance and device miniaturization. Therefore, self-driven photodetection without power modules exhibits broad application prospects in next-generation portable, energy-saving optoelectronic devices. Compared to conventional pn junction/heterojunction semiconductor materials, ferroelectric materials provide a simple and efficient way to achieve self-driven photodetection. Under light irradiation, photogenerated electron-hole pairs are generated inside the single-phase ferroelectric material, and the photo-generated carriers are separated under the action of the ferroelectric spontaneous polarization electric field, and the signal voltage and current are generated in the external circuit, thereby realizing the detection of light.
However, traditional inorganic ferroelectric materials limit their applications in optoelectronic devices due to their large forbidden band width and weaker semiconductor characteristics. In recent years, organic-inorganic hybrid perovskite ferroelectric materials have shown great potential in self-driven photodetection due to their large spontaneous polarization and excellent semiconductor characteristics.
The State Key Laboratory of Structural Chemistry of the Institute of Structural Physics of the Chinese Academy of Sciences, the researcher of the inorganic photoelectric functional crystal material Luo Junhua, was chaired by the National Natural Science Foundation of China, the National Outstanding Youth Fund, the Strategic Pilot Program of the Chinese Academy of Sciences, and the researcher of the “100 Team†of Haixi Research Institute. Under the support of the National Natural Science Foundation of China Excellent Youth Fund and other projects, self-driven photodetection was realized for the first time using two-dimensional hybrid perovskite ferroelectric (CH3CH2NH3)2(CH3NH3)2Pb3Br10. The study found that in the absence of external power supply, the material exhibits excellent photodetection performance under the driving of iron electrode, 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 an electric field-adjustable photodetection performance. This work not only provides a solution for us to explore multi-functional ferroelectric materials in the future, but also further expands the application of inorganic-organic hybrid ferroelectric materials in intelligent optoelectronic devices. The relevant research results have recently been published in the form of communication. In the German 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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