Recently, the China-U.S. Joint Photon Laboratory of the Guo Chunlei Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, was the first in the perovskite (CH) 3NH 3PbCl 3The surface-enhanced Raman spectroscopy (SERS) signal of the adsorbed molecule 4-mercaptopyridine (4-MPY) was observed on the single crystal surface. The enhancement factor was as high as 10-5.
Studies have shown that perovskite materials, as a semiconductor material, have SERS activity, and its surface adsorbed molecules can form a new charge transfer state at the interface, which promotes the charge transfer resonance at the interface to produce a SERS effect. Further research found the convergence between SERS technology and the field of photoelectric conversion research. Combining the two, it expanded the research field of SERS technology, making SERS technology show a certain potential in the field of photoelectric detection. And, through the The study found that molecularly sensitized perovskite materials have certain pioneering properties in the field of optoelectronic devices.
The results were published in the ACS Photonics magazine (Article ASAP DOI: 10.1021/acsphotonics.8b00152). The first author was assistant researcher Yu Zhi and the author of the communication was Guo Chunlei.
This work was supported by the national key R&D project, the National Natural Science Foundation of China, and the Jilin Provincial Science and Technology Agency Development Program.
Figure 1. 4-MPY-modified CH 3NH 3PbCl 3SERS spectra of single crystal perovskites at different wavelengths of laser (A), interface charge transfer diagram (B).
Figure 2. Schematic representation of the 4-MPY molecularly modified single crystal perovskite photodetector (A), I-V response curves at 532 nm, 633 nm, and dark state.
