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

FP García de Arquer, X Gong, RP Sabatini… - Nature …, 2017 - nature.com
Nature communications, 2017nature.com
Quantum dot and well architectures are attractive for infrared optoelectronics, and have led
to the realization of compelling light sensors. However, they require well-defined passivated
interfaces and rapid charge transport, and this has restricted their efficient implementation to
costly vacuum-epitaxially grown semiconductors. Here we report solution-processed,
sensitive infrared field-emission photodetectors. Using quantum-dots-in-perovskite, we
demonstrate the extraction of photocarriers via field emission, followed by the recirculation of …
Abstract
Quantum dot and well architectures are attractive for infrared optoelectronics, and have led to the realization of compelling light sensors. However, they require well-defined passivated interfaces and rapid charge transport, and this has restricted their efficient implementation to costly vacuum-epitaxially grown semiconductors. Here we report solution-processed, sensitive infrared field-emission photodetectors. Using quantum-dots-in-perovskite, we demonstrate the extraction of photocarriers via field emission, followed by the recirculation of photogenerated carriers. We use in operando ultrafast transient spectroscopy to sense bias-dependent photoemission and recapture in field-emission devices. The resultant photodiodes exploit the superior electronic transport properties of organometal halide perovskites, the quantum-size-tuned absorption of the colloidal quantum dots and their matched interface. These field-emission quantum-dot-in-perovskite photodiodes extend the perovskite response into the short-wavelength infrared and achieve measured specific detectivities that exceed 1012 Jones. The results pave the way towards novel functional photonic devices with applications in photovoltaics and light emission.
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