Σύστημα Φασματοσκοπίας Φωτορεύματος & Φωτοτάσης με Διαμόρφωση Έντασης (Intensity-Modulated Photocurrent & Photovoltage Spectroscopy System)
Σύστημα Φασματοσκοπίας Φωτορεύματος και Φωτοτάσης με Διαμόρφωση Έντασης: Χρησιμοποιείται για την αξιολόγηση του χρόνου μεταφοράς φορέων, των ρυθμών ανασύνθεσης και άλλων χρόνων κλίμακας σε μετρήσεις φωτορεύματος/φωτοτάσης με διαμόρφωση της έντασης του φωτός.
Intensity-Modulated Photocurrent & Photovoltage Spectroscopy System
The Intensity-Modulated Photocurrent & Photovoltage Spectroscopy System allows to perform sample examination that is complementary to static photovoltage/photocurrent measurements. Monochromatic LED with modulated light intensity of sinusoidal waveform in a wide range of frequencies enables to investigate many kinetic quantities: diffusion parameters, time scales of the sample: carrier transport time, recombination rates and many others. In case of photoelectrochemical samples immersed in an electrolyte, the sample may be illuminated on both sides: through the electrolyte, to investigate electrolyte-sample surface interface, or through the rear optical window for substrate-sample interface examination. The sample setup is placed in the Sample Chamber that screens ambient light and external EM fields.
⬛ Quantities measured by the instrument:
- Minority carriers lifetime (recombination time),
- Carrier transport time through the sample,
- Rate of the charge transfer through the interfaces,
- Diffusion constant,
- Diffusion length for a given sample thickness,
- Sample thickness for a given diffusion length,
- Other kinetic quantities.
IMPS/IMVS modules
⬛ The instrument consists of:
- LED Changer light source,
- Potentiostat for photocurrent and Open Circuit Potential (OCP) measurement,
- Electrochemical Shielding Box that screens the external EM fields as well as ambient light,
- Electrochemical Cuvette with Pt and Ag/AgCl electrodes.
⬛ Electrochemical Shielding Box Interior
Specifications
⬛ LED Changer
- 10 LED slots,
- Default LED set: 365 nm, 385 nm, 405 nm, 450 nm, 520 nm, 590 nm, 630 nm, 740 nm, 840 nm, white (3000 K),
- Custom LED selection available,
- Typical electric power of LEDs: 3W,
- Light intensity modulation: square, saw, or sinusoidal waveform with adjustable amplitude and bias light intensity,
- Light modulation frequency range: 1 µHz ÷ 10 kHz
Controller
- Maximum sampling rate: 1 kSample/s,
- Connection with PC: via USB 2.0.
⬛ Potentiostat
- Bias potential range: -5 V ÷ 5 V,
- Current ranges: 10 nA, 100 nA, 1 µA, 10 µA, 100 µA, 1 mA, 10 mA,
- Current resolution: from 1 pA to 100 nA (range dependent),
⬛ Electrochemical cuvette
- Adapted for transparent and opaque samples,
- PTFE container for electrolyte,
- Reference electrode: Ag/AgCl,
- Counter electrode: Pt.
ΠΑΡΟΜΟΙΑ ΠΡΟΪΟΝΤΑ
