Photovoltaic Device Performance Characterization
Summary
The performance of photovoltaic devices is characterised by measuring electrical and optical parameters under controlled conditions to determine efficiency, stability and operational limits. Standard test conditions define irradiance, spectrum and temperature to provide comparable benchmarks for short-circuit current, open-circuit voltage, fill factor and overall power conversion efficiency. Advanced techniques probe spatial and spectral responses to identify non-uniformity, degradation pathways and recombination losses. Calibration against reference cells and spectral mismatch corrections are essential to minimise measurement uncertainty. Emerging in situ and high-throughput methods allow dynamic tracking of device performance during stress testing, light soaking or cyclic operation. Accurate characterisation underpins scale-up from laboratory cells to modules and informs materials design, module reliability and integration into energy systems worldwide.
Research from Nature Portfolio
Recent studies have introduced high-resolution photoluminescence and electroluminescence mapping combined with machine-learning algorithms to extract local recombination activity in perovskite and silicon cells, enabling rapid identification of sub-micrometre defects that limit module yield. A novel transient electro-optical technique integrates lock-in thermography with impedance spectroscopy to quantify charge-carrier lifetime and series resistance simultaneously, offering improved sensitivity to early degradation in tandem architectures. Work on in situ spectroscopic ellipsometry during operation has provided real-time monitoring of thin-film crystallinity changes under illumination, informing the design of more stable wide-bandgap absorbers for tandem applications.
Photovoltaic Device Performance Characterization publication trend
The graph below shows the total number of articles in photovoltaic device performance characterization across all publications each year (not limited to Nature Index journals).
Technical terms
Standard Test Conditions (STC): Defined irradiance, spectrum and temperature used for benchmarking photovoltaic performance.
Fill Factor: Ratio of maximum extractable power to the product of open-circuit voltage and short-circuit current, indicating device quality.
Spectral Mismatch Correction: Adjustment applied when reference and device spectra differ to ensure accurate current measurement.
Lock-in Thermography: Technique using modulated excitation and phase-sensitive detection to map local heating and resistive losses.
Charge-Carrier Lifetime: Time over which photogenerated carriers remain mobile before recombining, affecting efficiency and stability.
References
- Improvements in world-wide intercomparison of PV module calibration. Solar Energy (2017).
- Reduction of uncertainties for photovoltaic reference cells. Metrologia (2015).
- Linearity of photovoltaic devices: quantitative assessment with N-lamp method. Measurement Science and Technology (2019).
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