Low noise ultraviolet photodetector with over 100% enhanced lifetime based on polyfluorene copolymer and <scp>Z</scp>n<scp>O</scp> nanoparticles

Azadinia, Mohsen; Fathollahi, Mohammad-Reza; Ameri, Mohsen; Shabani, Siyavash; Mohajerani, Ezeddin

doi:10.1002/app.46533

Cited by 8 publications

(1 citation statement)

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“…The photocurrent decreased only by 3.4% after 3 months. Compared with previously reported PDs [22,48], our device showed excellent stability due to the excellent thermal and chemical stability both of porous-GaN and CoPc.…”

Section: Resultsmentioning

confidence: 80%

High-Performance Self-Powered Ultraviolet Photodetector Based on Nano-Porous GaN and CoPc p–n Vertical Heterojunction

Xiao

Liu

et al. 2019

Nanomaterials

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Gallium nitride (GaN) is a superior candidate material for fabricating ultraviolet (UV) photodetectors (PDs) by taking advantage of its attractive wide bandgap (3.4 eV) and stable chemical and physical properties. However, the performance of available GaN-based UV PDs (e.g., in terms of detectivity and sensitivity) still require improvement. Fabricating nanoporous GaN (porous-GaN) structures and constructing organic/inorganic hybrids are two effective ways to improve the performance of PDs. In this study, a novel self-powered UV PD was developed by using p-type cobalt phthalocyanine (CoPc) and n-type porous-GaN (CoPc/porous-GaN) to construct a p–n vertical heterojunction via a thermal vapor deposition method. Under 365 nm 0.009 mWcm−2 light illumination, our device showed a photoresponsivity of 588 mA/W, a detectivity of 4.8 × 1012 Jones, and a linear dynamic range of 79.5 dB, which are better than CoPc- and flat-GaN (CoPc/flat-GaN)-based PDs. The high performance was mainly attributed to the built-in electric field (BEF) generated at the interface of the CoPc film and the nanoporous-GaN, as well as the nanoporous structure of GaN, which allows for a higher absorptivity of light. Furthermore, the device showed excellent stability, as its photoelectrical property and on/off switching behavior remained the same, even after 3 months.

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Section: Resultsmentioning

confidence: 80%