Ultrathin colloidal QDs optoelectronic devices for ultrafast photodetection
Yu-Hao Deng a, Setare Ezat Kheradmand a, Chao Pan b, Jari Leemans a, Pieter Geiregat a, Dries Van Thourhout b, Zeger Hens a
a Physics and Chemistry of Nanostructures Group, Ghent University, 9000 Ghent, Belgium
b NB Photonics, Ghent University, 9052 Ghent, Belgium
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
#NCFun23 - Fundamental Processes in Nanocrystals and 2D Materials
València, Spain, 2023 March 6th - 10th
Organizers: Valerio Pinchetti and Shalini Singh
Poster, Yu-Hao Deng, 346
Publication date: 22nd December 2022

Colloidal quantum dots (QDs) are considered as a rising candidate for new-generation electronics, due to their unique properties, such as tunable bandgap, narrow emission bandwidth, and cost-effective solution processing. However, ultrafast response and super bending resistance are still two obstacles which prohibit the application of colloidal QDs in real-time diagnosis, high-speed communication, and wearable devices. Here, we design ultrathin structure for colloidal QDs optoelectronic devices, which show the record 2.8 ns response time for ultrafast photodetection in PbS QDs system, super stability under 100,000 repetitive bending cycles in flexible devices, and the external quantum efficiency of 100% at short-wave infrared (SWIR) region. Moreover, formation of high-quality PN junction and inhibition of capacitance effect in ultra-thin devices are also proposed in this work. This work demonstrates the ultra-high performance in ultra-thin devices, and shows this structure has the bright future in ultra-fast and ultra-bending resistance colloidal QDs optoelectronics.

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