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Field-emission from quantum-dot-in-perovskite solids.

F Pelayo García de Arquer¹, Xiwen Gong¹, Randy P Sabatini¹

¹Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.

Nature Communications

|March 25, 2017

Summary

This summary is machine-generated.

Researchers developed sensitive, solution-processed infrared photodetectors using quantum dots in perovskite. This breakthrough enables efficient infrared optoelectronics without costly semiconductors, paving the way for advanced photonic devices.

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Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Quantum dot and quantum well architectures are promising for infrared optoelectronics but typically require expensive, vacuum-epitaxially grown semiconductors due to stringent interface and charge transport demands.
Existing technologies are limited by the cost and complexity associated with achieving high-performance infrared sensors.

Purpose of the Study:

To report on solution-processed, sensitive infrared field-emission photodetectors.
To demonstrate the efficient extraction and recirculation of photocarriers using a novel quantum-dots-in-perovskite architecture.
To explore the potential of these devices for infrared optoelectronic applications.

Main Methods:

Fabrication of photodetectors using a quantum-dots-in-perovskite structure.
Utilizing field emission for photocarrier extraction and recirculation.
Employing in operando ultrafast transient spectroscopy to analyze bias-dependent photoemission and carrier recapture.

Main Results:

Demonstrated solution-processed, sensitive infrared field-emission photodetectors.
Achieved specific detectivities exceeding 10¹² Jones.
Extended perovskite response into the short-wavelength infrared spectrum.
Highlighted the synergistic benefits of perovskite transport properties, quantum dot absorption tuning, and matched interfaces.

Conclusions:

The developed field-emission quantum-dot-in-perovskite photodiodes offer a cost-effective and high-performance alternative for infrared sensing.
This work paves the way for novel functional photonic devices with potential applications in photovoltaics and light emission.
Solution-processing enables wider accessibility to advanced infrared optoelectronic technologies.