Field-emission from quantum-dot-in-perovskite solids.
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 1012Jones. The results pave the way towards novel functional photonic devices with applications in photovoltaics and light emission.
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
F Pelayo
FP
García de Arquer
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
Xiwen
X
Gong
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
Randy P
RP
Sabatini
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
Min
M
Liu
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
Gi-Hwan
GH
Kim
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
Brandon R
BR
Sutherland
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
Oleksandr
0000-0002-8656-5074
O
Voznyy
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
Jixian
J
Xu
Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, Canada M5S 3G8.
Yuangjie
Y
Pang
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
Sjoerd
S
Hoogland
Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, Canada M5S 3G8.
David
0000-0003-2714-6408
D
Sinton
Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada M5S 1A4.
Edward
E
Sargent