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    FTPS Fourier Transform Photocurrent Spectroscopy

    • In semiconductor devices, imperfect crystallinity often causes defects or trap states in the forbidden bandgap. These greatly affect the overall optical and electrical performance of the device. Since the absorption coefficient in the bandgap is extremely low, the generated photocurrent signal is also extremely weak. Therefore, a highly sensitive detection system is required.
    • Enlitech‘s Fourier Transform Photocurrent Spectroscopy (FTPS) / Highly Sensitive External Quantum Efficiency (HS-EQE) (FTPS) is a highly sensitive photocurrent and external quantum efficiency (HS-EQE) spectroscopy system.
    • It utilizes Fourier Transform Signal Processing technology to enhance and break through the photocurrent signal detection limits.
    • The lowest EQE level can be as low as 10-5% (7 orders)*.
    • FTPS can be applied to detect the tail states of perovskite solar cells and the charge transfer state of organic solar cells, which are key to improving Voc loss mechanisms.
    • Another common application is Urbach Energy measurement.
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    Overview

    • In semiconductor devices, imperfect crystallinity often causes defects or trap states in the forbidden bandgap. These greatly affect the overall optical and electrical performance of the device. Since the absorption coefficient in the bandgap is extremely low, the generated photocurrent signal is also extremely weak. Therefore, a highly sensitive detection system is required.
    • Enlitech‘s Fourier Transform Photocurrent Spectroscopy (FTPS) / Highly Sensitive External Quantum Efficiency (HS-EQE) (FTPS) is a highly sensitive photocurrent and external quantum efficiency (HS-EQE) spectroscopy system.
    • It utilizes Fourier Transform Signal Processing technology to enhance and break through the photocurrent signal detection limits
    • The lowest EQE level can be as low as 10-5%(7 orders)*.
    • FTPS can be applied to detect the tail states of perovskite solar cells and the charge transfer state of organic solar cells, which are key to improving Voc loss mechanisms.
    • Another common application is Urbach Energy measurement.

    Key Features

    • Direct spectroscopy evidence for trap states, defect states or charge transfer states.
    • Wavelength range: 0.7-2 eV, 600-1800nm.
    • Turn-key solution; generate reliable spectral data after installation. Time-saving and cost-effective (at least 1-year and 20k USD).
    • Complete the training course, which includes operational and fundamental background training.
    • Proven by over 50 SCI journal papers.
    • Not just data acquisition, but also energy level fitting! We provide CTS and Urbach Energy level fitting software.

    Specification

     

    Model FTPS (PECT-600)
    Wavelength Range 0.7-2 eV, 600-1800nm
    Dynamic Range ≥ 7 orders ≥120dB; and can be extended to 140dB (option)
    Repeatability >99 % (under AM1.5G)
    Software Charge Transfer Energy Fitting, Urbach Energy Calculation
    Equipment dimension 550(L)*510(W)*355.3mm(H)

    Applications

    • Trap states, defect states or charge-transfer-state (CTS).
    • CTS fitting through Marcus theory.
    • Urbach energy fitting.

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