Pioneer to Ship PC-Based Blu-ray Disc Drive in Q1 2006 Micro-holographic discs have a larger storage capacity than DVDs or Blu-ray because they store information on the disc in three dimensions, rather than just pits on the surface of the disc. G.E. has recently made dramatic improvements in the material that significantly increases the amount of light that can be reflected by the holograms. By increasing the reflectivity of the disc you increase the storage capacity. This will enable players to be built which are backwards compatible with existing DVD and Blu-ray technologies.In a statement, from G.E.: “the hardware and formats are so similar to current optical storage technology that the micro-holographic players will enable consumers to play back their CDs, DVDs and Blu-ray discs.”G.E. also added: “the day when you can store your entire high definition movie collection on one disc and support high resolution formats like 3D television is closer than you think.” GE will need to work with hardware manufacturers to bring the technology to the consumer market.Micro-holographic technology is truly a breakthrough in the development of the materials that are so critical to ultimately bringing holographic storage to the everyday consumer.General Electric’s first priority will be to target the technology to commercial markets like television networks, movie studios, medical field and hospitals for holding data-intensive images. However selling to the broader corporate and consumer market is the larger goal.© 2009 PhysOrg.com (PhysOrg.com) — G.E. has unveiled a 500 GB micro-holographic disc that is the same size as existing DVD’s. The storage capacity is equivalent to 100 DVD’s and is aimed at the archive industry but eventually can be used in the consumer market place. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
Cross-sectional FESEM image of the device consisting of FTO-Glass/bl-TiO2/mpTiO2/perovskite/PTAA/Au. Credit: Science, DOI: 10.1126/science.aaa9272 © 2015 Tech Xplore Journal information: Science This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Perovskite solar cell reaches record efficiency As scientists have reached what appears to be the efficiency limit for solar cells based on silicon, the search has been on for a material to replace it, one that is at least as efficient, cost effective and will last for as long as possible. One such material perovskite, has been making headlines of late, as researchers have been improving its solar efficiency rating at a remarkable pace, from 14 percent in 2012, to 20 percent last year (the fastest that a solar technology has ever advanced). Now, it appears that mark has been raised again by the same team in Korea.Perovskite is a mineral made of calcium titanate—its use in solar cells is mostly found as a hybrid organic-inorganic lead as part of the active (light-harvesting) layer. It does not need to go through the multi-step process seen with silicon to be used in making solar cells, nor require the clean room, high temperature or a vacuum. The new process developed by the team in Korea involves placing a lead iodide–dimethylsulfoxide layer onto a formamidinium iodide solution—which causes the formation of a formamidinium lead iodide perovskite composition. The result is a more efficient cell as it allows for gathering a broader spectrum of light. Thus far, the team reports that cells made with their new method have reached efficiencies of up to 20.2 percent. They also claim that their method also allows for producing the cells more cheaply than other fabrication methods.What is still not clear is how well such cells can stand up to environmental conditions over long periods of time—some other recent research by other teams has suggested they may not be able to maintain their efficiencies over reasonable timescales. Still, because of its promise, several start-ups have promised sales of such cells to consumers as early as 2017. More information: High-performance photovoltaic perovskite layers fabricated through intramolecular exchange, Science, DOI: 10.1126/science.aaa9272ABSTRACTThe band gap of formamidinium lead iodide (FAPbI3) perovskites allows broader absorption of the solar spectrum compared to conventional methylammonium lead iodide (MAPbI3). The optoelectronic properties of perovskite films are closely related to the film-quality, so depositing dense and uniform films is crucial for fabricating high-performance perovskite solar cells (PSCs). We report an approach for depositing high-quality FAPbI3 films, involving FAPbI3 crystallization by the direct intramolecular exchange of dimethylsulfoxide (DMSO) molecules intercalated in PbI2 with formamidinium iodide. This process produces FAPbI3 films with (111)-preferred crystallographic orientation, large-grained dense microstructures, and flat surfaces without residual PbI2. Using films prepared by this technique, FAPbI3-based PSCs with maximum power conversion efficiency of over 20% were fabricated. Explore further Citation: Researchers develop method of fabricating perovskite solar cells that is more efficient, costs less (2015, May 22) retrieved 18 August 2019 from https://phys.org/news/2015-05-method-fabricating-perovskite-solar-cells.html (Phys.org)—A team of researchers working at the Korea Research Institute of Chemical Technology in South Korea, has found a way to make fabricating perovskite based solar cells that is both more efficient and costs less than other current methods. In their paper published in the journal Science, the team describes their process and the efficiencies they were able to achieve.
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