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High-bandwidth, high-sampling-rate, low-noise, two-probe transient photovoltage measuring system
1Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, People's Republic of China.
The Review of Scientific Instruments
|February 2, 2015
Summary
We developed a new two-probe system for measuring transient photovoltage (TPV) signals in semiconductors, improving signal quality. This technique reveals unique TPV behaviors, aiding the study of dynamic photo-electronic processes.
Area of Science:
- Materials Science
- Electrical Engineering
- Solid State Physics
Background:
- Transient photovoltage (TPV) measurements are crucial for characterizing photo-electronic semiconductor devices.
- Conventional one-probe systems often suffer from limitations in signal-to-noise ratio and electrode-specific analysis.
Purpose of the Study:
- To introduce a novel two-probe configuration for enhanced TPV signal measurement.
- To investigate the capabilities and performance of the new TPV measurement system.
- To explore unusual TPV signal behavior in organic semiconductor devices.
Main Methods:
- Implementation of a two-probe measurement system monitoring both electrodes of a device under test.
- Utilizing organic semiconductor devices based on N, N'-Di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine for experimental validation.
- Characterization of system bandwidth and sampling rate.
Main Results:
- Achieved a significantly enhanced signal-to-noise ratio compared to one-probe systems.
- Demonstrated system bandwidth of 1.5 GHz and sampling rate of 50 GS/s without noise degradation.
- Observed and analyzed abnormal TPV signal behavior where individual probe measurements did not cancel out, attributed to the material's photoelectric response.
Conclusions:
- The novel two-probe TPV measurement technique offers superior performance for semiconductor analysis.
- The observed abnormal TPV behavior provides new insights into dynamic processes in photo-electronic materials.
- This method holds potential for advancing the understanding of charge carrier dynamics in semiconductors.
