Canadian researchers have designed and tested a new solid-state, stable, photosensitive nanoparticle, a colloidal quantum dot technology that will be used to develop cheaper, more flexible solar cells and better gas sensors, infrared lasers, Infrared light emitting diode. The research results were published in the latest issue of Nature Materials.
Colloidal quantum dots collect sunlight based on two types of semiconductors: N-type (rich electrons) and P-type (spent electrons). However, when the N-type semiconductor material is exposed to the air, it combines with the oxygen atom, loses its electrons, and is converted into a P-type material.
Ning Zhijun, the first author of the thesis and a postdoctoral fellow in the Department of Electrical and Computer Engineering at the University of Toronto, said in an interview with the author that the new colloidal quantum dot technology developed by his research team allows N-type materials to be combined with oxygen when exposed to air. . At the same time, maintaining a stable N-type and P-type layer not only improves the light absorption efficiency, but also opens the door to a new type of optoelectronic device that simultaneously achieves the best performance of light trapping and electrical conduction, which means that new technologies can be developed to Complex meteorological satellites, remote control equipment, satellite communications or pollution detectors.
Ning Zhijun said that this is only the first step in the research of this material innovation, using this new material to build a new device structure. Compared with ordinary silicon material batteries, colloidal quantum dot materials can be synthesized at low temperatures, with low energy consumption and simple process. This solution treatable inorganic material enhances the stability and portability of the battery. The study found that iodine is the perfect ligand for quantum point solar cells with high efficiency and air stability.
Because the absorption spectrum reaches the infrared region, this new NP hybrid material absorbs more light energy, resulting in solar conversion efficiencies of up to 8%. Improved performance is only the beginning of this new quantum dot solar cell structure. In the future, these powerful quantum dots can be mixed with ink, sprayed or printed onto a thin, soft roof tile surface, thus greatly reducing the cost of solar power for the benefit of ordinary people.
Ning Zhijun introduced that colloidal quantum dot solar photovoltaic technology has achieved rapid development in the past 10 years, and solar energy conversion efficiency has increased from the initial 0.1% to about 10% under laboratory conditions. But to achieve commercialization of the technology, it is necessary to continuously improve its absolute performance, or power conversion efficiency.
Editing circle
8%, compared to the conversion efficiency of more than 20% of monocrystalline silicon solar cells, it seems that it is not worth mentioning, but this comparison is not very meaningful, just like letting a baby and a middle-aged person go to the wrist. It should be noted that the conversion efficiency of colloidal quantum dot cells was only 4.2% two years ago, and now it is nearly doubled. It is very difficult for silicon-based batteries to increase by 1% with the attention of countless research institutions. Moreover, the theoretical conversion efficiency of colloidal quantum dot cells can reach 42%, and silicon-based batteries are only 31%. This is definitely a thriving technology, but to be commercialized, efficiency needs to be increased to more than 10% before it can compete with other new materials.
Stainless Steel Pillow Block Bearing
Stainless Steel Pillow Block Bearing,Stainless Steel Pillow Block Bearing Housing,Pillow Block Bearing,Pillow Block Bearing Sha208
Jiangsu Dingtian Stainless Steel Products Co., Ltd. , https://www.dingtiancasting.com