Transient Photo-Current and Tansient Photo-Voltage Tester for Perovskite Solar Cells
This system is designed to measure the transient photocurrent and photo-voltage of solar cells over time to analyze the transport mechanisms of photogenerated charge carriers and obtain the Charge Transfer Lifetime (from TPC) and Charge Recombination Lifetime (from TPV). By using a fast laser source, the system can irradiate the photovoltaic device to generate photocurrent or photo-voltage signals and perform time-domain measurement and analysis to obtain the curves of transient photo-voltage (TPV) and transient photocurrent over time, which can be used to understand the internal structure and charge carrier dynamics of the photovoltaic device.
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- The laser module system wavelength is selectable (405nm, 520nm, 635nm, 940nm)
- Rise time < 5ns
- Fall time < 5ns
- Laser light guiding and fiber optic coupling components
- Photocurrent signal acquisition device
- Maximum measurement bandwidth: 350MHz (-3dB)
- Time resolution (Rise time): <1.15 ns
- Record length: 25k
- Sampling rate: 5GSa/s
- Measurement voltage range: 2mV/div~ 5V/div
- Time range: 1 ns/div and 100 s/div
- Arbitrary waveform generator
- Maximum modulation frequency 15MHz
- Basic waveform output: sine wave, square wave, pulse wave, ramp wave, DC
- Waveform output voltage 20mVpp~5Vpp (HighZ), 14bits resolution.
Perovskite Solar Cell
The Importance of understanding and measuring TPC and TPV
a. Understanding: The generation and collection of light-generated carriers
c. Improving: Solar cell Jsc performance
a. Understanding: Light-generated charge carriers separation mechanism.
1. Bandgap of active layer
2. Doping levels
3. Interface quality
c. Improving: Solar cell Voc performance
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What are TPC and TPV?
TPC: Transient PhotoCurrent
TPC affects the overall efficiency of the solar cell by impacting the rate at which light-generated charge carriers can be collected by the electrodes. A slow rate of carrier collection can lead to significant losses due to recombination and diffusion. By measuring TPC, it is possible to determine the internal resistance of the cell and to identify areas for improvement in the collection of light-generated charges.
TPV: Transient PhotoVoltage
TPV affects the efficiency of the solar cell by impacting the separation of light-generated charge carriers. A low TPV can indicate poor quality of the p-n junction, low doping levels, or a bandgap that is not well matched to the spectral response of the solar cell. By measuring TPV, it is possible to gain insights into the quality of the p-n junction and to identify areas for improvement in the separation of light-generated charges.