New Materials to Improve Photovoltaic Cell Efficiency
Author: Source: Datetime: 2016-10-08 15:46:28
US Science Daily reported on October 25, the crystal is the core of the diode. The crystal is not a naturally occurring crystal present in quartz, but is a crystal material which is artificially made to form an alloy (for example, indium gallium nitride). This alloy can form light-emitting diode (visible light band) and the laser diode (blue ultraviolet band) light-emitting area. How to Make Better Crystalline Materials - High Crystallinity, Light Emitting Efficiency and Luminosity - is also the work of Alex Fischer, a scientist in the Fernando Pons research team at the Department of Physics, Arizona State University, and Dr. Wei Yong, Ph.D. candidate, is in the research focus. In a recent paper in Applied Physics, the team revealed a rationale for a new approach to growing indium gallium nitride (GaN) crystal materials for diodes, a new approach that is expected to drive breakthroughs in photovoltaic solar powered portable generator technology Of the efficiency. Working with the team was a team led by Georgia Institute of Technology professor Alan Doolittle.
Reported that these In GaN crystal is sapphire substrate cultured on the layered structure. As usual, the researchers found that there was a difference in the atomic spacing of these layered structures: a phenomenon that could lead to high pressures, disruption of growth, and fluctuations in the chemical composition of alloys. "It would be very beneficial to reduce this pressure and improve the uniformity of solar PV generation system module nuts during the formation of InGaN crystals, but it is difficult to achieve," said Professor Pons. Culturing these lamellar structures is similar to trying to seamlessly combine two honeycombs with different honeycomb sizes. When the two honeycombs are combined together, the difference in size will disrupt the regularity of the hive.
According to the researchers in the paper narrative, they invented the method using molecular pulse to obtain the required alloy composition. This method, invented by Doolittle, is called modulation-oriented epitaxy. "This technique allows for the layered growth of the crystalline material at the atomic level," said Ponce, the first author of the paper, and co-author Wei Yong, who analyzed the atomic arrangement and luminosity at the nanoscale.The films grown by the epitaxial orientation technique have almost ideal properties and reveal that this unexpected result comes from a decrease in pressure during the growth of the first atomic layer of crystals.
Poults says Doolittle's team assembled a more uniform crystal with the lattice matched together, resulting in a film that resembles a perfect crystal. Luminosity is also close to the perfect crystal. This has been considered impossible in our field. Elimination of the non-uniformity of crystal material composition and lattice mismatch, which once seemed to be insurmountable defects, will ultimately lead to the development of efficient light-emitting diodes and solar photovoltaic products such as solar powered portable generator in the future
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