Enhanced photo-response of porous silicon photo-detectors by embeddingTitanium-dioxide nano-particles

Ali, Hiba M.; Makki, Sameer A.; Ahmed, N.

doi:10.1088/1742-6596/1003/1/012073

Cited by 6 publications

(1 citation statement)

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“…The energy band gap of the Au: TiO2 NPs was 4.3, 4.4, and 5.3eV of laser energies (600, 800, and 1000 mJ respectively), which is larger than the 3.2 eV of bulk TiO2. When the energy of the laser pulses increases (the laser power increases), nanoparticles size decreases, and therefore the energy gap values will increase according to the effects of quantum confinement [44]. Figure 4 shows the Current density-Voltage (I-V) characteristics in forward and reverse biases of the Al/Au:TiO2 NPs/PS/nSi/Al in dark surroundings, we found in Figure 4 that there is an increase in the forward current by the increase of voltage (greater 1Volt) and the leakage current decreases (less 1 Volt) because of the resistivity of porous layer decrease.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Au:TiO2 Nanoparticles via Laser Ablation in Liquid Deposited on Porous-Si for Improved Spectral Responsivity

Suliman¹,

Nayef²,

Mutlak³

2022

JASN

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In this study, Au:TiO2 nanoparticles (NPs) are prepared by using the laser ablation method in liquid at different laser energies (600, 800, and1000 mJ). After that, Au: TiO2 NPs were deposited on porous-Si(PS). Porous silicon (PS) is synthesized by using the photoelectrochemical etching (PECE) of n-type crystalline Si (c-Si) wafers of (100) orientation. The intensity of the etching current density was (4, 12, and 20 mA/cm 2 ), with 16% (HF), and the etching time was 15 minutes. The X-ray diffraction (XRD) techniques, scanning electron microscopy (SEM), UV-visible spectrophotometry, and electrical properties are used to characterize the obtained particles. From the photo-detector measurements, the spectral responsivity curves three inclusive regions; the first peak was due to the absorption of UV light by Au: TiO2 NPs. The second peak was corresponding to the visible light absorption with the PS layer and the third peak was due to the absorption edge of the Si substrate. The higher responsivity of Au: TiO2 NPs/PS photo-detector was found to be 2.56A/W for specimens prepared at laser energy 800mJ.

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Section: Resultsmentioning

confidence: 99%