4.8 Article

Ambipolar Charge Storage in Type-I Core/Shell Semiconductor Quantum Dots toward Optoelectronic Transistor-Based Memories

期刊

ADVANCED SCIENCE
卷 8, 期 16, 页码 -

出版社

WILEY
DOI: 10.1002/advs.202100513

关键词

InP; ZnS quantum dots; optoelectronic memory; organic transistors; photonic synaptic transistors; type-I core-shell quantum dots

资金

  1. Natural Science Foundation of Guangdong Province [2019A1515011367]
  2. National Natural Science Foundation of China [61974094]
  3. Key Research and Development Project of Guangdong Province [2020B010169003]
  4. Science and Technology Innovation Commission of Shenzhen [JCYJ20200109105413475]

向作者/读者索取更多资源

The research focuses on studying the charge storage ability of type-I InP/ZnS core/shell quantum dots in a pentacene-based organic transistor. The quantum dots can directly confine either holes or electrons in the core, and can be charged by electrons using light illumination.
Efficient charge storage media play a pivotal role in transistor-based memories and thus are under intense research. In this work, the charge storage ability of type-I InP/ZnS core/shell quantum dots is well revealed through studying a pentacene-based organic transistor with the quantum dots (QDs) integrated. The quantum well-like energy band structure enables the QDs to directly confine either holes or electrons in the core, signifying a dielectric layer-free nonvolatile memory. Especially, the QDs in this device can be charged by electrons using light illumination as the exclusive method. The electron charging process is ascribed to the photoexcitation process in the InP-core and the hot holes induced. The QDs layer demonstrates an electron storage density of approximate to 5.0 x 10(11) cm(-2) and a hole storage density of approximate to 6.4 x 10(11) cm(-2). Resultingly, the output device shows a fast response speed to gate voltage (10 mu s), large memory window (42 V), good retention (>4.0 x 10(4) s), and reliable endurance. This work suggests that the core/shell quantum dot as a kind of charge storage medium is of great promise for optoelectronic memories.

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