A self-powered UV photodetector based on TiO2 nanorod arrays

Xie, Yanru; Wang, Lin; Wei, Guodong; Li, Qinghao; Wang, Dong; Chen, Yanxue; Yan, Shishen; Liu, Guolei; Mei, Liangmo; Jiao, Jun

doi:10.1186/1556-276x-8-188

Cited by 181 publications

(75 citation statements)

References 24 publications

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“…At zero bias, the device achieved an overall external quantum effi ciency (EQE) of >1% throughout the UV region and peaked at >3% at 350 nm wavelength. The response speed was characterized to be less than 1 s. The performance is comparable to, if not better than, most of the fl exible [ 14,[16][17][18]33 ] or even rigid UV detectors, [ 1,[3][4][5]19 ] in the literature. A performance comparison between devices on tracing papers and reed membranes is also made.…”

Section: Communicationmentioning

confidence: 92%

“…Furthermore, Au also shows good adhesion on the cellulose Ultraviolet (UV) detection has been extensively studied thanks to its wide applications in communication, pollution monitoring, and medicine. While high-performance UV photodetection has been achieved in previous research work [1][2][3][4][5][6][7][8] and even for commercial use, the rigidity of these devices limits their usage for applications requiring portability and wearability, which is the current trend for commercial electronics. This is where solution-processable nanomaterials can make distinguishable contributions.…”

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confidence: 99%

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A Flexible Nanocrystal Photovoltaic Ultraviolet Photodetector on a Plant Membrane

Lin

2015

Advanced Optical Materials

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COMMUNICATIONthat the porosity of paper could be turned into advantages when its utilization in the device fabrication is optimized. The large surface-volume ratio of porous structures facilitates the adhesion of NCs and thus eases the material deposition. The porosity also enhances light scattering (large optical haze [ 26 ] and increases the light absorption of the active material, which improves the overall device performance. Furthermore, paper is able to act as a good interspacing layer to prevent short-circuit problem commonly encountered in fabricating vertical devices with NCs on fl exible substrates. People have long used paper as a dielectric layer for energy storage devices [ 29,30 ] and fi eld effect transistors. [ 25,31 ] Based on these rationales, we have fabricated CdSe quantum dot photodetectors on tracing papers and achieved consistent results, [ 32 ] yet the large thickness of conventional papers deteriorates the carrier transportation and reduces the optical transparency as well. The high density of fi bers in a paper also reduces the concentration of quantum dots that can be incorporated into the structure, which further reduces the device performance.On the other hand, Mother Nature has supplied us with a variety of thin and porous cellulose structures with good transparency in the form of plant membranes, such as reed inner fi brous structures or leaf-structuring membranes. In this communication, UV photodetectors are fabricated, as far as we know, for the fi rst time on a reed plant membrane ( Figure 1 a). The material is commercially available as the vibration membrane for Chinese bamboo fl utes. At a thickness of ≈5 µm when compressed, the membrane is signifi cantly thinner than most of the commercial papers (>30 µm) and offers much better transparency. We designed a vertical structure for the device that consists of a ZnO NC-embedded reed membrane sandwiched between gold and aluminum electrodes, as shown in Figure 1 b. Though lateral photoconductor structure is typically of interest due to its simplicity and potentially high optical gain, ZnO NC-based fl exible UV photoconductors in general suffer from slow response [15][16][17][18][33][34][35] due to the large number of trapping states and slow carrier mobilities compared to bulk semiconductor material. By using the cellulose structure as an interspacing layer with the active material embedded, a Schottky junction structure can be readily achieved between ZnO and Au as shown in Figure 1 c, which improves the response speed. While thin-fi lm Au and indium tin oxide (ITO) can both serve as transparent electrodes and have high work functions that can result in Schottky junctions interfacing with ZnO, ITO becomes opaque at UV region and it also has poor fl exibility due to the ceramic-like crystal structure. Given these plus further consideration in fabrication simplicity, we chose Au as the transparent electrode for our device despite that ITO is currently the most widely used transparent electrode material. Furthermore, Au also shows good...

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Section: Communicationmentioning

confidence: 92%

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confidence: 99%

A Flexible Nanocrystal Photovoltaic Ultraviolet Photodetector on a Plant Membrane

Lin

2015

Advanced Optical Materials

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“…Response time and recovery time were clearly the shortest times obtained among TiO 2 UV detectors reported in literature [70][71][72][73][74]. Wide depletion layers and small Schottky barrier capacitance can be achieved using Pt.…”

Section: Current-voltage Characteristicsmentioning

confidence: 86%

Effects of variations in precursor concentration on the growth of rutile TiO2 nanorods on Si substrate with fabricated fast-response metal–semiconductor–metal UV detector

Selman

Hassan

2015

Optical Materials

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“…In AAO-assisted synthesis of nanostructures, sol-gel and electrochemical deposition are both well-known liquidphase deposition methods for forming TiO 2 nanowires [17,18]; however, both methods require drying and sintering processes to promote crystallinity. During the sintering process, the templates are fired, which complicates their removal.…”

Section: Introductionmentioning

confidence: 99%

AAO-assisted synthesis of highly ordered, large-scale TiO2 nanowire arrays via sputtering and atomic layer deposition

Zhao¹,

Li²,

Kim³

2016

Nano Online

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Highly ordered nanoporous anodic aluminum oxide (AAO) thin films were fabricated in oxalic acid under a constant voltage via a two-step anodization process. To investigate the high-aspect-ratio (7.5:1) filling process, both sputtering and atomic layer deposition (ALD) were used to form TiO 2 nanowires. Field emission scanning electron microscopy and high-resolution transmission electron microscopy images indicated that mushroom-like TiO 2 structures were sputtered onto the AAO template surface, and the ALD-coated TiO 2 exhibited fine filling results and clear crystal grain boundaries. Large-scale and free-standing TiO 2 nanowire arrays were liberated by selectively removing the aluminum substrate and AAO template via a wet etching process with no collapsing or agglomeration after the drying process. ALD-deposited TiO 2 nanowire arrays that were 67 nm in diameter and 400 nm high were transferred from the AAO template. The ALD process enabled the rapid, simple synthesis of highly ordered TiO 2 nanowire arrays with desired parameters such as diameter, density, and thickness determined using diverse AAO templates.

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A self-powered UV photodetector based on TiO2 nanorod arrays

Cited by 181 publications

References 24 publications

A Flexible Nanocrystal Photovoltaic Ultraviolet Photodetector on a Plant Membrane

A Flexible Nanocrystal Photovoltaic Ultraviolet Photodetector on a Plant Membrane

Effects of variations in precursor concentration on the growth of rutile TiO2 nanorods on Si substrate with fabricated fast-response metal–semiconductor–metal UV detector

AAO-assisted synthesis of highly ordered, large-scale TiO2 nanowire arrays via sputtering and atomic layer deposition

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