Effect of surface morphology on the optical properties of InAs/Ge (1 1 1)

Pal, Sujay; Sathe, Vasant; Rajiv, K.; Mukherjee, C.; Kumar, Ravi; Dixit, V. K.

doi:10.1016/j.apsusc.2016.03.017

Cited by 6 publications

(1 citation statement)

References 41 publications

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“…However, among all of the samples studied here, STOPM (1:1) shows the lowest values of n . It is known that dielectric constant/refractive index values reduce with nanostructurization because of the quantum confinement effect . STOPM (1:1) shows a value lower than that of STOPM (1:5) and STOPM (1:10) because of nanorod formation with varying sizes.…”

Section: Resultsmentioning

confidence: 95%

PMMA as an Additive for Nanostructured TiO₂ Thin Films for Heterojunction Visible-Blind Photodetectors

Pal,

Jana,

Kamparath

et al. 2024

ACS Appl. Nano Mater.

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This study reports on high-quality, crystalline, nanostructured TiO 2 thin films with large-area coverage prepared by the sol−gel process using PMMA (poly(methyl methacrylate)) as an additive for applications in visible-blind photodetection. The Si/TiO 2 p−n junction photodiodes, fabricated through an inexpensive yet simple process with the addition of PMMA, exhibit superior characteristics, making them excellent candidates for visible-blind photodetectors operational in the UV and NIR ranges. The addition of PMMA to the solution significantly enhances the crystalline and optical properties, as well as the nanostructure morphology of the TiO 2 films. It is demonstrated that the nanostructure morphology, refractive index, and bandgap of TiO 2 can be precisely tailored by controlling the TiO 2 sol/PMMA volume ratio. A valence band offset as large as 2.8 ± 0.20 eV is measured for the TiO 2 /Si heterointerface, ensuring hole blockage through the film and electron-selective transport. Application of the TiO 2 nanostructured thin films in the p-Si/n-TiO 2 junction photodiodes reveals an excellent rectification ratio of ∼2 × 10 4 with a leakage current as low as ∼10 −10 A and a superior phototo-dark current ratio of ∼8000 under 325 nm illumination. Under reverse bias conditions, the photodiodes exhibit a reasonably high photoresponsivity (>1 A/W) with a high detectivity of ∼1 × 10 13 Jones. Moreover, a response time of ∼200 ms is achieved using these photodiodes.

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Section: Resultsmentioning

confidence: 95%

PMMA as an Additive for Nanostructured TiO₂ Thin Films for Heterojunction Visible-Blind Photodetectors

Pal,

Jana,

Kamparath

et al. 2024

ACS Appl. Nano Mater.

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Surface and interface properties of ZrO2/GaAs, SiO2/GaAs and GaP/GaAs hetero structures investigated by surface photovoltage spectroscopy

Roychowdhury

Dixit

Vashisht

et al. 2019

Applied Surface Science

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Design, fabrication and optical characterizations of pyrimidine fused quinolone carboxylate moiety for photodiode applications

Elkanzi

Farag

Roushdy

et al. 2020

Optik

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Effect of surface morphology on the optical properties of InAs/Ge (1 1 1)

Cited by 6 publications

References 41 publications

PMMA as an Additive for Nanostructured TiO₂ Thin Films for Heterojunction Visible-Blind Photodetectors

PMMA as an Additive for Nanostructured TiO₂ Thin Films for Heterojunction Visible-Blind Photodetectors

Surface and interface properties of ZrO2/GaAs, SiO2/GaAs and GaP/GaAs hetero structures investigated by surface photovoltage spectroscopy

Design, fabrication and optical characterizations of pyrimidine fused quinolone carboxylate moiety for photodiode applications

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Effect of surface morphology on the optical properties of InAs/Ge (1 1 1)

Cited by 6 publications

References 41 publications

PMMA as an Additive for Nanostructured TiO2 Thin Films for Heterojunction Visible-Blind Photodetectors

PMMA as an Additive for Nanostructured TiO2 Thin Films for Heterojunction Visible-Blind Photodetectors

Surface and interface properties of ZrO2/GaAs, SiO2/GaAs and GaP/GaAs hetero structures investigated by surface photovoltage spectroscopy

Design, fabrication and optical characterizations of pyrimidine fused quinolone carboxylate moiety for photodiode applications

Contact Info

Product

Resources

About

PMMA as an Additive for Nanostructured TiO₂ Thin Films for Heterojunction Visible-Blind Photodetectors

PMMA as an Additive for Nanostructured TiO₂ Thin Films for Heterojunction Visible-Blind Photodetectors