A team of Taiwanese researchers yesterday said they had collaborated with Japanese researchers to develop a new memory device that can transmit both electronic and light signals.
The team comprised researchers from National Taiwan Normal University (NTNU), National Taiwan University and Japan’s Kyushu University, NTNU professor of electro-optical engineering Lee Ya-ju (李亞儒) told a news conference in Taipei.
Many researchers are seeking to produce next-generation memory devices to replace the widely used flash memory and while resistive random access memory (RRAM) is considered an alternative, its operational speed has some room for improvement, Lee said.
Photo courtesy of the Ministry of Science and Technology
Semiconductor researchers have combined RRAM and light-emitting diodes to develop light-emitting memory devices, but the fabrication process is more complicated due to the need to integrate various materials, he said.
To overcome the problem, Lee said his team turned to cesium lead bromide to develop perovskite quantum dots for a memory device.
Perovskite is a natural mineral that can be chemically synthesized and has been widely used in semiconductor manufacturing.
Using cesium lead bromide is one of the ways to synthesize perovskite, but some toxicity of lead has to be tolerated for the material to be stable, Lee said.
The team also used silver to make the device’s electrodes, he added.
When they applied different voltages to the device, the varieties of ions in the device changed, allowing it to store and read data electronically or optically, Lee said.
Through perovskite quantum dots of different sizes, the device emits different colors to indicate whether it is reading ones or zeros, he said.
The team’s findings were published in the journal Nature Communications in July.
The team’s technique might change the future of consumer electronics, given light transmits data faster than electronics, NTNU College of Technology and Engineering dean Kao Wen-chung (高文忠) said.
The research has expanded the use of perovskite and set a new example for the integration of electronics and photonics, said the Ministry of Science and Technology, which funded the project.
Considering that most countries issue more than five denominations of banknotes, the central bank has decided to redesign all five denominations, the bank said as it prepares for the first major overhaul of the banknotes in more than 24 years. Central bank Governor Yang Chin-lung (楊金龍) is expected to report to the Legislative Yuan today on the bank’s operations and the redesign’s progress. The bank in a report sent to the legislature ahead of today’s meeting said it had commissioned a survey on the public’s preferences. Survey results showed that NT$100 and NT$1,000 banknotes are the most commonly used, while NT$200 and NT$2,000
The Centers for Disease Control (CDC) yesterday reported the first case of a new COVID-19 subvariant — BA.3.2 — in a 10-year-old Singaporean girl who had a fever upon arrival in Taiwan and tested positive for the disease. The girl left Taiwan on March 20 and the case did not have a direct impact on the local community, it said. The WHO added the BA.3.2 strain to its list of Variants Under Monitoring in December last year, but this was the first imported case of the COVID-19 variant in Taiwan, CDC Deputy Director-General Lin Ming-cheng (林明誠) said. The girl arrived in Taiwan on
ANNUAL EVENT: Two massive Pokemon balloons are to be set up in Daan Park, with an event zone operating from 10am to 6pm This year’s Taipei Floral Picnic is to be held at Daan Park today and tomorrow, featuring an exclusive Pokemon Go event, a themed food market, a coffee rave picnic area and stage performances, the Taipei Department of Information and Tourism said yesterday. Two massive Pokemon balloons are to be set up in the park as attractions, with an exclusive event zone operating from 10am to 6pm, it said. Participants who complete designated tasks on-site would have a chance to receive limited-edition souvenirs, it added. People could also try the newly launched game Pokemon Pokopia in the trial area, the department said. Three PokeStops are
South Korea is planning to revise its controversial electronic arrival card, a step Taiwanese officials said prompted them to hold off on planned retaliatory measures, a South Korean media report said yesterday. A Yonhap News Agency report said that the South Korean Ministry of Foreign Affairs is planning to remove the “previous departure place” and “next destination” fields from its e-arrival card system. The plan, reached after interagency consultations, is under review and aims to simplify entry procedures and align the electronic form with the paper version, a South Korean ministry official said. The fields — which appeared only on the electronic form
RSS