Structural and optical properties of glancing angle deposited In2O3 columnar arrays and Si/In2O3 photodetector

Mondal, Aniruddha; Shougaijam, Biraj; Goswami, Tamal; Dhar, Jay Chandra; Singh, Naorem Khelchand; Choudhury, Sushabhan; Chattopadhay, K. K.

doi:10.1007/s00339-013-7835-8

Cited by 23 publications

(3 citation statements)

References 18 publications

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“…On the other hand, it is to be noted that the sizes of the films are centimeter-scale, demonstrating great feasibility for the implementation of arrayed integrated optoelectronic devices with the state-of-the-art planar semiconductor micromachining technology (PSMT). [38][39][40][41] Therefore, the annealed film in this work may hold great potential for the achievement of pronounced PPC according to the previous discussion. (3 of 11) 1600908 Figure 2a,b presents the typical high-magnification scanning electron microscope (SEM) images of the as-deposited and annealed In 2 Te 3 films.…”

Section: Introductionmentioning

confidence: 60%

An Innovative Postdeposition Annealing Approach Producing Centimeter‐Scale In₂O₃/In₂(TeO₃)₃ Bulk Heterojunction Thin Film for Room‐Temperature Persistent Photoconductivity

Yao

Zheng

Yang

2017

Advanced Optical Materials

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extensive applications such as optoelectronic memory, [1,2] light-enhanced gas sensing, [3][4][5] imaging, [6] photocatalysis, [7,8] photovoltaics, [9,10] and radiation detection. [11] However, thus far, the majority of researchers focus on the conventional rapid photoswitching, [12][13][14][15][16] while PPC phenomena have attracted much less attention. Traditionally, PPC phenomena were commonly found in nanomaterial-based devices with large surface to volume ratio, [2,[17][18][19][20][21] in which the spontaneous surface potential spatially separated the photogenerated electron-hole pairs. As a result, after the termination of the photoexcitation, these nonequilibrium carriers can still cycle across the transport channel for an extended time before their recombination, leading to the persistent photocurrent. However, the low-dimensional geometry of nanomaterials still poses great challenges to the implementation of integrated devices with a large amount of arrayed functional optoelectronic units on account of their extremely low maneuverability. Recently, by gating 2D layered flakes with back-toback Schottky electrodes, potential wells separating photogenerated carriers were formed and persistent photoconductivity was achieved. [6] However, the large gate voltage up to tens of volts may cause unpredictable danger, unrepairable device damage as well as high energy consumption, which seriously hamper their widely commercial applications. On the other hand, PPC phenomena have also been commonly observed in semiconductor-based heterostructure systems. [22][23][24][25] However, the functional portions of these devices are limited to the heterointerface and its adjacent portions. Therefore, traditional double-layered heterostructures can cause a waste of materials. Additionally, these traditional heterostructures based on thick layers suffer rigidity. Thus, they are unavailable for flexible and wearable devices, limiting their adaptability to various working environments. Moreover, well-engineered heterointerface with specific terminal lattice plane is often proposed to be essential for the occurrence of PPC, [22,23,26,27] which adds additional processing cost and complexity in device implementation.Persistent photoconductivity holds great significance to a variety of interesting applications. However, persistent photoconductivity devices based on large-scale thin films produced by a facile and efficient technology have rarely been achieved so far. In this work, centimeter-scale In 2 O 3 /In 2 (TeO 3 ) 3 bulk heterojunction thin films are prepared via an innovative and convenient two-step approach, an initial pulsed-laser deposition followed by a postdeposition annealing process. A prototype optoelectronic device is fabricated and it exhibits pronounced persistent photoconductivity with positive dependence on both the source-drain voltage and incident power density. This device also shows photoresponse to incident light with wavelengths from ultraviolet to red, revealing great potential for practical device applicati...

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Section: Introductionmentioning

confidence: 60%

An Innovative Postdeposition Annealing Approach Producing Centimeter‐Scale In₂O₃/In₂(TeO₃)₃ Bulk Heterojunction Thin Film for Room‐Temperature Persistent Photoconductivity

Yao

Zheng

Yang

2017

Advanced Optical Materials

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“…NWs because In 2 O 3 has been reported to form interconnected column beyond Zone I structure even under extreme shadowing effect condition due to sufficient diffusion of surface adatoms 29 . In this zone I, the homologous growth temperature parameter (θ = T S /T m ) is less than 0.2 where T s and T m are the substrate temperature and melting point of the deposited material, respectively with little surface diffusion of adatoms take place and the film microstructure and texture are controlled by shadowing 30 . Figure 2a shows that NWs are aligned closely, uniformly and vertically.…”

Section: Resultsmentioning

confidence: 99%

Annealing Effect of Glancing Angle Electron Beam Deposited TiO2/In2O3 Nanowires Array on Surface Wettability

Pooja

Chinnamuthu

2020

Sci Rep

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Pheiroijam pooja & Chinnamuthu p. ✉ tio 2 /in 2 o 3 nanowire (NW) array are prepared using catalyst free glancing angle deposition technique. The wettability of TiO 2 /in 2 o 3 NW surface are tuned and controlled by the annealing treatment without altering the surface with additional chemical coating. The phase change, surface roughness, change in static and dynamic contact angles due to the heat treatment are studied. Moreover, the surface properties such as frictional force and work of adhesion are calculated for all the samples. The samples annealed at 600 °C shows nearly superhydrophilic with static water contact angle of 12°, frictional force of 85.00748 µN and work of adhesion of 142.3721 mN/m. The surface of TiO 2 /in 2 o 3 NW is controlled to attain desired water contact angles and sliding angles, which is paramount for designing practical application in self-cleaning, electronic and biomedical fields. Surfaces with superhydrophilic wetting nature have been used in numerous applications such as anti-fogging, self-cleaning coatings and tissue reconstruction 1-5. Controlling the wettability of surface is desirable in various technical applications. In recent years, efforts have been made to improve the hydrophilicity of thin films. There are works on improvement of hydrophilicity using UV illumination of metaloxide films such as TiO 2 , SnO 2 and ZnO either doping by metal or non-metal 6,7. However, there are limitations in the application of these metal oxides for use as a reliable superhydrophilic coating and thus need to be checked. For practical application, surface of the film cannot be illuminated with UV light all the time and there is need of long lasting hydrophilicity in absence of UV illumination for anti-fogging surfaces, specifically in outdoor applications. We have reported on designing vertical stacked coaxial TiO 2-In 2 O 3 heterostructure nanowire (NW) , which studies on photoinduced hydrophilicity after UV-illumination 8. There are also reports on hydrophobic to hydrophilic conversion using surface derivatization, chemical grafting, wet chemical reactions and also modifying hydrophobic cross linked high internal phase emulsion polymer (polyHIPE) using styrene 9-11. Problems associated with these techniques are difficulties in implementation, high cost, polymer degradation possibility and scale up issues for large industrial production. There is no report on study of tuning the wettability of coaxial TiO 2-In 2 O 3 NW from hydrophobic to hydrophilic through simple heat treatment. Moreover, before TiO 2 /In 2 O 3 NWs are utilized successfully, annealing is necessary to improve the NWs crystallinity. During elevated annealing temperature, the solid-state sintering of TiO 2 nanostructure subsequently causes structure breakdown. Such results are more noticeable when there is enhanced mass transport and bond breaking during phase transformation from anatase to rutile 12,13. In case of In 2 O 3 , at elevated annealing temperature the grain stops growing or exhibits amorphous nature 14,15. Therefo...

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“…Enhance absorption was observed from In 2 O 3 NW sample both in the visible and UV region (Fig 2(b)), which is due to their large surface area to volume ratio of the In 2 O 3 NW [23]. Fig 2(c) shows the (αhv) 2 versus (hv) for the as deposited In 2 O 3 NW sample, where hv is the sample energy and α is the absorption of each wavelength which is given by 4k   …”

Section: Optical Characterizationmentioning

confidence: 94%

Synthesis of In2o3 Nanowires for the Application of LPG Sensor

.¹

2017

IJRET

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Structural and optical properties of glancing angle deposited In2O3 columnar arrays and Si/In2O3 photodetector

Cited by 23 publications

References 18 publications

An Innovative Postdeposition Annealing Approach Producing Centimeter‐Scale In₂O₃/In₂(TeO₃)₃ Bulk Heterojunction Thin Film for Room‐Temperature Persistent Photoconductivity

An Innovative Postdeposition Annealing Approach Producing Centimeter‐Scale In₂O₃/In₂(TeO₃)₃ Bulk Heterojunction Thin Film for Room‐Temperature Persistent Photoconductivity

Annealing Effect of Glancing Angle Electron Beam Deposited TiO2/In2O3 Nanowires Array on Surface Wettability

Synthesis of In2o3 Nanowires for the Application of LPG Sensor

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Structural and optical properties of glancing angle deposited In2O3 columnar arrays and Si/In2O3 photodetector

Cited by 23 publications

References 18 publications

An Innovative Postdeposition Annealing Approach Producing Centimeter‐Scale In2O3/In2(TeO3)3 Bulk Heterojunction Thin Film for Room‐Temperature Persistent Photoconductivity

An Innovative Postdeposition Annealing Approach Producing Centimeter‐Scale In2O3/In2(TeO3)3 Bulk Heterojunction Thin Film for Room‐Temperature Persistent Photoconductivity

Annealing Effect of Glancing Angle Electron Beam Deposited TiO2/In2O3 Nanowires Array on Surface Wettability

Synthesis of In2o3 Nanowires for the Application of LPG Sensor

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An Innovative Postdeposition Annealing Approach Producing Centimeter‐Scale In₂O₃/In₂(TeO₃)₃ Bulk Heterojunction Thin Film for Room‐Temperature Persistent Photoconductivity

An Innovative Postdeposition Annealing Approach Producing Centimeter‐Scale In₂O₃/In₂(TeO₃)₃ Bulk Heterojunction Thin Film for Room‐Temperature Persistent Photoconductivity