Si photodiode

Manufactured by Hamamatsu Photonics

Sourced in Japan

The Si photodiode is a type of semiconductor device that converts light energy into electrical energy. It is designed to detect and measure light intensity by generating an electrical current proportional to the amount of incident light. The device's core function is to provide a reliable and efficient means of light detection and measurement.

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Lab products found in correlation

Tds 2012c, by National Instruments (1 mentions) Omni λ300, by Zolix (1 mentions) Ni 6221, by National Instruments (1 mentions)

2 protocols using si photodiode

Transient Absorption Spectroscopy of Photoanodes

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TAS measurements were carried out using the third harmonic of a Nd:YAG laser (EKSPLA, NT 342B, 355 nm, 5 ns pulse width, 0.9 Hz) as the excitation source. A liquid light guide transmitted the laser pulse to the sample resulting in an incident pump intensity of ca. 177 μJ cm⁻² (355 nm). A 100 W tungsten lamp (Bentham, IL 1) coupled to a monochromator (Zolix, Omni - λ 300) was used as the probe light. Variation in optical density (∆OD) of the sample was calculated by measuring the transmitted light using a Si photodiode (Hamamatsu) and an amplification system coupled to both an oscilloscope (Tektronix, TDS 2012C) and data acquisition card (National Instruments NI-6221). The data were averaged over 400 laser shots. OCP measurements were conducted in 1 M NaOH solution with or without 0.5 M Na₂SO₃. The operando TAS experiments were implemented by three-electrode setup controlled by a CHI 760C potentiostat in 1M NaOH solution (pH = 13.7), with the photoanode, Pt, and Ag/AgCl as working, counter and reference electrodes, respectively. During TAS measurements, a constant potential was maintained by chronoamperometry.

Zhang H., Li D., Byun W.J., Wang X., Shin T.J., Jeong H.Y., Han H., Li C, & Lee J.S. (2020). Gradient tantalum-doped hematite homojunction photoanode improves both photocurrents and turn-on voltage for solar water splitting. Nature Communications, 11, 4622.

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Wireless Scintillator Catheter for β-Radiation

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The prototype β-detection catheter and wireless display are shown in Fig. 1a. The diameter of the flexible catheter is 2.67 mm, which is equivalent to 8 Fr. The catheter tip detector consists of a 1.2 × 1.2 × 0.5 mm anthracene-doped poly(vinyltoluene) plastic scintillator (BC-412, Saint-Gobain, France) coupled to a 1 mm x 1 mm solid state Si photodiode (Hamamatsu Photonics, Japan) (Fig. 1b). The plastic scintillator was selected for its high efficiency β-radiation detection and minimal γ-ray sensitivity, which reduces background signals and preserves spatial resolution. Electrical signals from the photodiode are transmitted to the catheter base via flexible Kapton-embedded wires. These signals are amplified, digitized, and modulated to a Bluetooth® radio (Bluetooth SIG, Kirkland, WA) and transmitted wirelessly to the remote display unit. A version of the device contains a retractable 27 G needle for therapeutic delivery, which can be accessed via injection port at the catheter base (Fig. 1c).

Stendahl J.C., Liu Z., Boutagy N.E., Nataneli E., Daghighian F, & Sinusas A.J. (2020). Prototype device for endoventricular beta-emitting radiotracer detection and molecularly-guided intervention. Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, 29(2), 663-676.

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