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.
NATIONAL SECURITY: Authorities are working to confirm the identities of the military personnel involved and investigating possible illegal conduct and regulatory violations Authorities are probing possible national security implications after Kinmen police and immigration officers on Sunday found a Chinese woman allegedly posing as a tourist while engaging in prostitution involving more than 10 military personnel. The woman, surnamed Chen (陳), has since been deported, authorities said, adding that investigators are still working to confirm the identities of those implicated, as the records only listed code names and aliases. The case stemmed from a report received by the Kinmen District Prosecutors’ Office on Friday last week from the Jinhu Precinct of the Kinmen County Police Bureau. On Sunday, police, along with the National Immigration
GLOBALGIVING: ‘ Caving to external pressure is not acceptable for an organization that has cultivated justice reform and human rights for 30 years,’ one NGO said A slew of non-government organizations (NGOs) have withdrawn from the GlobalGiving fundraising platform after it announced it would use “Chinese Taipei” instead of “Taiwan” from next month. The Taiwan Good Rice Association wrote on Facebook on Friday that it was informed on April 28 via a teleconference call of the change, which was made because the platform wanted to operate in China. Taiwan Good Rice is to terminate all cooperative relationships with GlobalGiving in response to the platform’s “unilateral and non-negotiable” decision to remove references to Taiwan, the NGO said. “Taiwan is in the official name of Taiwan Good Rice Association and the
HEAVY WEATHER: Typhoon Jangmi is due to crash straight into the Ryukyus as airlines look to shift flights to larger aircraft or cancel flights to Okinawa entirely Taiwan’s international air carriers announced flight adjustments over the weekend as Typhoon Jangmi is forecast to hit the Ryukyu Islands today and tomorrow. The Central Weather Administration (CWA) upgraded Jangmi from a tropical storm to a typhoon at 8am yesterday, with the eye located 580km south of Naha city. It was moving north at 19kph. Today, China Airlines’ CI-120, CI-121, CI-122 and CI-123 flights between Taoyuan and Naha, Okinawa, have been canceled as well as CI-132 and CI-133 between Kaohsiung and Naha. EVA Air’s BR-112, BR-113, BR-186 and BR-185 flights between Taoyuan and Naha are also canceled. Low-cost carrier Tigerair Taiwan canceled IT-230,
MULTIPRONGED APPROACH: China has sought to pressure Palau across a number of fronts, but the island nation has staunchly resisted overtures to ditch Taiwan Palau has been firm in backing Taiwan despite Chinese pressure that uses tourism economics, cyberattacks and criminal infiltration as tools to threaten the Pacific ally into renouncing its recognition of Taiwan as a sovereign state. The Presidential Office yesterday announced that Vice President Hsiao Bi-khim (蕭美琴) would visit Palau from Saturday to Wednesday next week at the invitation of Palauan President Surangel Whipps Jr. Whipps in April said in an interview that China had outspokenly asked Palau to “denounce Taiwan.” “And we have said: ‘We have no enemies, but nobody tells us who our friends are,’” he said. Whipps has told reporters multiple times
RSS