Research And Application Of GaN-Based Integrated Chip For Blue Light Energy Sensing Communication

With the shortage of energy and the increasingly urgent demand for energy in society,how to make good use of light energy,a low-carbon and environmentally friendly energy source,has become a key issue for research nowadays.With the gradual maturity of third-generation semiconductorrelated technologies,as well as the development of light-emitting diodes,photovoltaic cells,photodetectors and other optoelectronic devices,the use of GaN materials to prepare visible light communication and energy harvesting devices has become a hot spot for current research.GaN-based optoelectronic devices are widely used in communication,photovoltaic and energy fields because of their low cost and high photoelectric efficiency.In this paper,the basic working principles of GaN-based optoelectronic devices as light-emitting devices,detector devices and energy harvesting devices are studied,and a visible light communication system is built based on these basic working principles to complete the transmission of video signals.In this paper,we designed and prepared an integrated GaN-based energy-aware communication chip,and elaborated the chip preparation method,observed its surface structure by ultra-deep field microscope,and observed the layer structure of the cut optoelectronic device by using scanning tunneling microscope.Systematic performance analysis and testing of the chip was carried out to test the performance of the chip as a light-emitting device,detector device and photovoltaic device,and to test the operating conditions of the chip working under different environments.The coexistence phenomenon of luminescence detection was analyzed by different angles for the chip with overlapping luminescence detection spectra.This phenomenon is explained by the energy band theory and the second law of thermodynamics,and it is concluded that only shorter wavelength photons can be absorbed for photovoltaic conversion and the process is non-reversible.Based on the optoelectronic performance parameters of the chip,a visible light communication system based on the chip was designed and built,and the video signal transmission was carried out.The performance of the system in a single-channel scenario where the device is used as a lightemitting device to transmit modulated light signals,the performance of the device as a detector to detect modulated light signals,and the performance of the same device to communicate when the device is used as both a light-emitting device and a detector were measured.The experiments show that GaN-based LED devices with multiple functional modules integrated on the same substrate have good communication performance,and the design of homogeneous integration makes the chip capable of on-chip communication,enabling communication of the same devices and enabling data communication of 10 Mbps in outer space with high fidelity.Based on the communication performance parameters in these three cases,a visible video transmission system is built,and experiments show that the modified system can carry out video transmission communication at 1Mbps rate between the same devices.