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  EnglishNew>>Home>>discov>>正文

Prof. Wei Huang and His NPU Team Reported a Significant Progress of Perovskite Optoelectronics in Nature Electronics

2020-03-25 19:33  

Recently, Prof. Wei Huang and his team from Institute of Flexible Electronics of NPU have reported a new breakthrough in perovskite optoelectronics in Nature Electronics (Article title: Bidirectional optical signal transmission between two identical devices using perovskite diodes. Links: http://dx.doi.org/10.1038/s41928-020-0382-3)This work was in close collaboration with Prof. Feng Gao from Linköping University and Prof. Wenjing Zhang from Shenzhen University.

The fast, efficient, and reliable exchange of information often depends on the transmission and reception of modulated optical signals. The standard approach to making such communication bidirectional is to use a pair of devices at both nodes of the transferring channel: one device of the pair sends information and the other detects incoming light encoded with data. However, combining transmission and reception capabilities into a single device would allow miniaturized and compact architectures to be developed. While dual-functional devices have been developed in III–V semiconductors, such capabilities have proved difficult to achieve with solution-processed semiconductors, such as organic semiconductors and quantum-dots semiconductors.

 

Metal halide perovskites are emerging low-cost solution-processed semiconductors with various valuable optoelectronic properties. With targeted tailoring of material structures, they have been well proven in both light emission and photodetection. The large absorption emission spectral overlap of perovskites provides a unique opportunity for solution-processed semiconductors to achieve a high sensitivity to the light emitted by an identical device. These achievements and properties allow perovskites to meet the prerequisites for achieving bidirectional communication function with single dual-functional (light emission/detection) diodes. However, efforts to create such dual-functional perovskite devices have so far had limited success.

 

Writing in Nature Electronics, Zhang, Huang, Gao and their colleges have reported a perovskite diode that can switch between emission and detection modes, offering over 21% external quantum efficiency for light emission and a sub-picowatt limit for light detection. The authors have revealed a fast response speed reaching tens of megahertz in both emission and detection modes. With this approach, they built an efficient bidirectional optical communication system based on two identical perovskite diodes and a photoplethysmogram sensor for arterial pulse wave tracking.

 

As pointed out by Prof. Wei Huang, the members of IFE and IAM have been devoted to the research of perovskite light-emitting diodes, including the development of perovskite luminance materials, understanding of the mechanisms, and the exploration of new applications for a duration. IFE and IAM teams are one of the pioneers in this promising research field. This work is beneficial from our previous experience in developing high-performance perovskite light-emitting diodes, including “Perovskite light-emitting diodes based on solution-processed self-organized multiple quantum wells” (Nat. Photon.2016,10, 699), “Perovskite light-emitting diodes based on spontaneously formed submicrometre-scale structures” (Nature 2018,562, 249) and “Rational molecular passivation for high-performance perovskite light-emitting diodes” (Nat. Photon.2019,13, 418). The research results have once again explored new applications of perovskite materials in optoelectronics.

 

The above research work has been funded by the Key Projects of National Natural Science Foundation of China and the Projects of International Cooperation and Exchanges NSFC.

(Source: Institute of Flexible Electronics)

 

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