Photothermal Effect Induced Negative Photoconductivity and High Responsivity in Flexible Black Phosphorus Transistors
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 6048-6056 |
Journal / Publication | ACS Nano |
Volume | 11 |
Issue number | 6 |
Online published | 11 May 2017 |
Publication status | Published - 27 Jun 2017 |
Externally published | Yes |
Link(s)
Abstract
This paper reports negative photoconductivity mechanism in flexible black phosphorus (BP) transistors built on freestanding polyimide film. Near-infrared laser (λ = 830 nm) excitation leads to significantly suppressed device on-state current with a very high responsivity of up to 53 A/W. The underlying mechanism of the negative photoconductivity is attributed to the strong photothermal effect induced by the low thermal conductivity of the polyimide substrate used. The heat generated by the infrared light illumination results in enhanced phonon scattering, reduced carrier mobility, and consequently negative photocurrent. Such a phenomenon was not observed in similar BP devices built on SiO2/Si substrates whose thermal conductivity is much higher. The above photothermal mechanism is also supported by temperature-dependent electrical characterization and device simulation. Such a flexible BP infrared photodetector with ultrahigh responsivity may find potential applications in future wearable and biointegrated imaging systems.
Research Area(s)
- black phosphorus, flexible, infrared photodetectors, negative photoconductivity, photothermal effect
Citation Format(s)
Photothermal Effect Induced Negative Photoconductivity and High Responsivity in Flexible Black Phosphorus Transistors. / Miao, Jinshui; Song, Bo; Li, Qing et al.
In: ACS Nano, Vol. 11, No. 6, 27.06.2017, p. 6048-6056.
In: ACS Nano, Vol. 11, No. 6, 27.06.2017, p. 6048-6056.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review