Compound Quantum Dot-Perovskite Optical Absorbers on Graphene Enhancing Short-Wave Infrared Photodetection
| Autor: | Piers Andrew, Chris Bower, Surama Malik, Joseph Bottomley, Alexander Bessonov, Rushton Ashley, Alan Colli, Yinglin Liu, Mark G. Allen, Sami Kallioinen, Martti Voutilainen, Tapani Ryhänen, Ivonne Medina-Salazar |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Passivation Graphene business.industry General Engineering General Physics and Astronomy Nanotechnology 02 engineering and technology Photodetection Specific detectivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Photodiode law.invention law Quantum dot Optoelectronics General Materials Science Quantum efficiency 0210 nano-technology business Perovskite (structure) |
| Zdroj: | ACS nano. 11(6) |
| ISSN: | 1936-086X |
| Popis: | Colloidal quantum dots (QDs) combined with a graphene charge transducer promise to provide a photoconducting platform with high quantum efficiency and large intrinsic gain, yet compatible with cost-efficient polymer substrates. The response time in these devices is limited, however, and fast switching is only possible by sacrificing the high sensitivity. Furthermore, tuning the QD size toward infrared absorption using conventional organic capping ligands progressively reduces the device performance characteristics. Here we demonstrate methods to couple large QDs (>6 nm in diameter) with organometal halide perovskites, enabling hybrid graphene phototransistor arrays on plastic foils that simultaneously exhibit a specific detectivity of 5 × 1012 Jones and high video-frame-rate performance. PbI2 and CH3NH3I co-mediated ligand exchange in PbS QDs improves surface passivation and facilitates electronic transport, yielding faster charge recovery, whereas PbS QDs embedded into a CH3NH3PbI3 matrix produce spatial... |
| Databáze: | OpenAIRE |
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