Imperial College London
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DrNicolaGasparini

Faculty of Natural Sciences, Department of Chemistry

Lecturer in Chemistry
 
 
 
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Contact

 

+44 (0)20 7594 1013n.gasparini

 
 
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Location

 

401DMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Huang:2023:10.1002/smll.202310199,
author = {Huang, Y-T and Nodari, D and Furlan, F and Zhang, Y and Rusu, M and Dai, L and Andaji-Garmaroudi, Z and Darvill, D and Guo, X and Rimmele, M and Unold, T and Heeney, M and Stranks, SD and Sirringhaus, H and Rao, A and Gasparini, N and Hoye, RLZ},
doi = {10.1002/smll.202310199},
journal = {Small},
title = {Fast near-infrared photodetectors based on nontoxic and solution-processable AgBiS2},
url = {http://dx.doi.org/10.1002/smll.202310199},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Solution-processable near-infrared (NIR) photodetectors are urgently needed for a wide range of next-generation electronics, including sensors, optical communications and bioimaging. However, it is rare to find photodetectors with >300 kHz cut-off frequencies, especially in the NIR region, and many of the emerging inorganic materials explored are comprised of toxic elements, such as lead. Herein, solution-processed AgBiS2 photodetectors with high cut-off frequencies under both white light (>1 MHz) and NIR (approaching 500 kHz) illumination are developed. These high cut-off frequencies are due to the short transit distances of charge-carriers in the ultrathin photoactive layer of AgBiS2 photodetectors, which arise from the strong light absorption of this material, such that film thicknesses well below 120 nm are sufficient to absorb >65% of NIR to visible light. It is also revealed that ion migration plays a critical role in the photo-response speed of these devices, and its detrimental effects can be mitigated by finely tuning the thickness of the photoactive layer, which is important for achieving low dark current densities as well. These outstanding characteristics enable the realization of air-stable, real-time heartbeat sensors based on NIR AgBiS2 photodetectors, which strongly motivates their future integration in high-throughput systems.
AU  - Huang,Y-T
AU  - Nodari,D
AU  - Furlan,F
AU  - Zhang,Y
AU  - Rusu,M
AU  - Dai,L
AU  - Andaji-Garmaroudi,Z
AU  - Darvill,D
AU  - Guo,X
AU  - Rimmele,M
AU  - Unold,T
AU  - Heeney,M
AU  - Stranks,SD
AU  - Sirringhaus,H
AU  - Rao,A
AU  - Gasparini,N
AU  - Hoye,RLZ
DO  - 10.1002/smll.202310199
PY  - 2023///
SN  - 1613-6810
TI  - Fast near-infrared photodetectors based on nontoxic and solution-processable AgBiS2
T2  - Small
UR  - http://dx.doi.org/10.1002/smll.202310199
UR  - https://onlinelibrary.wiley.com/doi/full/10.1002/smll.202310199
UR  - http://hdl.handle.net/10044/1/110427
ER  -
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