Memory of OLED and isolator can be optically or electrically written and read

November 25, 2019 //By Christoph Hammerschmidt
Memory of OLED and isolator can be optically or electrically written and read
Scientists from the Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and the Center for Advancing Electronics Dresden (cfaed) have developed a novel storage technology from the combination of an organic light-emitting diode (OLED) and an insulator. Such a device makes it possible to read stored information both optically and electrically. In addition, the information can be added step-by-step - thus several storage states can be mapped in one device.

This development has its roots deep in the past: A diode-capacitor memory was first presented by Arthur W. Holt at a conference in Canada in 1952, but it is only now that this concept is experiencing a revival through the use of organic semiconductors, since all the functions of a discrete combination of diodes and capacitor can be integrated into a single memory cell.

The "pinMOS" memory cell consists of a Memcapacitor implemented in MOS technology with high repeatability and reproducibility. The special feature is that the pinMOS memory is able to store several states, since charges can be added or removed step by step. Another attractive feature is that this simple diode-based memory can be both electrically and optically written to and read from. Currently, a lifetime of slightly more than 100 read-write erase cycles is achieved, and the memory states can be maintained and differentiated over 24 hours.

According to the scientists, the results show that the pinMOS storage principle as a reliable capacitive storage medium is promising for future applications in electronic and photonic circuits such as neuromorphic computers or visual storage systems.

The results have now been published in the journal Advanced Functional Materials. An innovation also came to bear in all measurements in the test series: These were carried out exclusively with the innovative SweepMe! measurement software developed by the IAPP and cfaed start-up company of the same name.

More information:  www.cfaed.tu-dresden.de


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