An air-stable ultraviolet photodetector based on mesoporous TiO<sub>2</sub>/spiro-OMeTAD

Bai, Huiwen; Shen, Ting; Tian, Jianjun

doi:10.1039/c7tc02787g

Cited by 28 publications

(18 citation statements)

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“…32,33 Responsivity (R) is a measure of the current output per optical input and is a key factor that determines the device sensitivity. 34,35 From Figure 2c, the responsivities of the double HTL-based device for excitation at wavelengths of 350 nm, 450 nm and 800 nm at a power of 100 mW/cm 2 are 37.0, 41.5 and 10.5 mA/W, respectively, which are 1.8, 4.0 and 3.5 times larger than those of the single HTL-based device. In addition, the photoresponsivity spectra correspond to the absorption spectra of the CdSe x Te 1-x QDs in Figure 1f.…”

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confidence: 98%

Enhanced-performance of self-powered flexible quantum dot photodetectors by a double hole transport layer structure

2019

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Section: Please Do Not Adjust Marginsmentioning

confidence: 98%

Enhanced-performance of self-powered flexible quantum dot photodetectors by a double hole transport layer structure

2019

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“…This compound has a rather high Tg (above 125 °C) which is promising to achieve high device thermal stability. [25][26][27] It has been combined with various nanostructured wide bandgap oxide layers. Xie et al [28] prepared UV-PDs based on Spiro-OMeTAD and TiO2 nanorod arrays while Game et al [29] investigated the combination of this molecular compound with ZnO NRs.…”

Section: Introductionmentioning

confidence: 99%

“…Xie et al [28] prepared UV-PDs based on Spiro-OMeTAD and TiO2 nanorod arrays while Game et al [29] investigated the combination of this molecular compound with ZnO NRs. Bai et al [27] used a mesoporous TiO2 layer as the n-type nanostructure. Molecular p-type SCs, especially Spiro-OMeTAD, allow a high pore filling of mesoporous nanostructured films.…”

Section: Introductionmentioning

confidence: 99%

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Response Enhancement of Self‐Powered Visible‐Blind UV Photodetectors by Nanostructured Heterointerface Engineering

Zhu

Alvarez

et al. 2019

Adv Funct Materials

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The development of efficient photodetectors (PDs) for ultraviolet (UV) light is of great importance for many applications. In the present paper, we propose a novel approach for boosting the performances of self-powered PDs. Visible-blind UV-A PDs have been built by combining a mesoporous TiO2 layer with a Spiro-OMeTAD layer. The nanostructured heterointerface has been engineered by inserting a self-assembled layer of organic modifiers. By choosing the 4-nitrobenzoic acid (NBA), the responsivity has been boosted by 70% compared to the pristine devices. It achieved 64 mA/W at 0 V bias, 380 nm and 1 mW.cm-2. The PD displayed a very high sensitivity (> 10 4), a fast response time (< 3ms), a high stability and repeatability. 4-chlorobenzoic acid, 4-methoxy benzoic acid, 4-nitro benzoic acid and βalanine surface modifier have been studied by a combined experimental and theoretical approach. Their dipole moment has been calculated. Their presence induces a step in the Received: ((will be filled in by the editorial staff)) Revised: ((will be filled in by the editorial staff))

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“…Furthermore, thermal treatment leads to crystal phase change and grain growth. 14,15 In the case or Ni-P alloy, magnetic properties are improved, what is detrimental to the aimed application. After dissolution of the photoresist in acetone, the surface morphology was characterized by optical microscopy (Olympus BX60) and Scanning Electron Microscopy (SEM, Hitachi 3600N).…”

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Micromolding of Ni-P with Reduced Ferromagnetic Properties for 3D MEMS

Risquez

Woytasik

Cai

et al. 2017

J. Electrochem. Soc.

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This paper presents the development of nickel phosphorus (Ni-P) micromolding for the manufacturing of a 3D electrostatic energy harvesting microsystem. Ni-P alloy exhibits weak ferromagnetic properties beyond 10-12 wt% phosphorus content. Deposits were prepared at different current densities (−10 to −150 mA/cm 2 ) and concentration of phosphorous acid in the electrolyte (0-20 g/l). It was found that the deposition rate decreases when phosphorus content increases in the deposit. The final process leaded the choice of a H 3 PO 3 concentration of 5 g/l to reach a 0.1 μm/min deposition rate for phosphorus content higher than 13 wt%. Mechanical, electrical and magnetic properties of the Ni-P films were investigated on 1 mm 2 and 1 cm 2 square deposit and confirmed the suitability of that material for the target MEMS. Comb patterns of micromolded Ni-P have been realized on a 2-inch wafer, leading to a 10 μm thick deposit containing 13.5 wt% in P, which is, at our knowledge, the first high phosphorus Ni-P micromolding involving electrodeposition growth for 3D MEMS applications. The latest generation of pacemaker, lead-free, is directly implanted in the cardiac cavities of the heart, thus improving considerably patient comfort and reducing complications with common pacemaker such as lead failure. However, leadless pacemakers should overcome several issues such as the limited lifespan of the lithium-based battery used to supply those pacemakers. This involves a surgery of the patient every 7 to 10 years, whereas about 45% of patients survive more than 10 years after their first pacemaker implantation.1 The challenge for improving pacemaker's lifetime explains the strong interest for harvesting energy from the heart, which is a long reliable energy source.Among the solution leading to a volume compatible with implantation in the heart by intravenous catheter, energy harvesting from inertial movement seems promising once its design challenges the very low fundamental heart beat frequencies (1-3 Hz).2 Our team has already proposed such a design for an out-of-plane overlap electrostatic energy harvesting MEMS that would be able to harvest about 10 μW in average power. 3 The final layout of the proposed device is presented in Figure 1. The device is 5.5 mm in diameter and will have a total height of 1 mm.The fabrication process of such device is compatible with other types of 3D MEMS and is based on an original additive process (Figure 2) combining alternative electroplating of a patterned structural material (nickel) and a sacrificial material (copper). Nickel and copper have been chosen respectively for their mechanical properties, their high growth rate and the high etching selectivity of copper against nickel during wet etching. Electroplating is a low cost, fast and simple fabrication process which makes it very suitable for thick film growth. When combined with a lithography step in the micromolding process, film patterning is achieved (Figure 2a) by localized growth inside the mold. Finally the process is completed by ...

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An air-stable ultraviolet photodetector based on mesoporous TiO₂/spiro-OMeTAD

Abstract: A spiro-OMeTAD/mesoporous TiO2 heterojunction structure was developed for a highly sensitive and air-stable ultraviolet photodetector.

Cited by 28 publications

References 41 publications

Enhanced-performance of self-powered flexible quantum dot photodetectors by a double hole transport layer structure

Enhanced-performance of self-powered flexible quantum dot photodetectors by a double hole transport layer structure

Response Enhancement of Self‐Powered Visible‐Blind UV Photodetectors by Nanostructured Heterointerface Engineering

Micromolding of Ni-P with Reduced Ferromagnetic Properties for 3D MEMS

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An air-stable ultraviolet photodetector based on mesoporous TiO2/spiro-OMeTAD

Abstract: A spiro-OMeTAD/mesoporous TiO2 heterojunction structure was developed for a highly sensitive and air-stable ultraviolet photodetector.

Cited by 28 publications

References 41 publications

Enhanced-performance of self-powered flexible quantum dot photodetectors by a double hole transport layer structure

Enhanced-performance of self-powered flexible quantum dot photodetectors by a double hole transport layer structure

Response Enhancement of Self‐Powered Visible‐Blind UV Photodetectors by Nanostructured Heterointerface Engineering

Micromolding of Ni-P with Reduced Ferromagnetic Properties for 3D MEMS

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An air-stable ultraviolet photodetector based on mesoporous TiO₂/spiro-OMeTAD