Researcher(s)
- Maribel Benitez-Cruz, , University of Delaware
Faculty Mentor(s)
- Kevin Dobson, IEC, University of Delaware
Abstract
J-V testing, short for current–voltage testing, is a fundamental technique used to evaluate the electrical performance of photovoltaic (PV) devices, including perovskite solar cells (PSCs). By measuring the current–voltage characteristics under different operating conditions, J-V testing provides critical insights into a device’s efficiency, power output, and reliability. This method plays a key role in understanding the behavior of PV modules, allowing researchers and manufacturers to identify issues such as performance degradation, electrical mismatches, and cell defects. The testing process involves the use of specialized equipment such as solar simulators and source meters, combined with precise sample preparation to ensure accurate and repeatable results. Parameters such as open-circuit voltage, short-circuit current, and fill factor are extracted from the J-V curve to assess overall device quality.
In PSCs, one significant challenge affecting J-V measurements and long-term stability is the light-soaking effect (LSE). LSE refers to fluctuations in photovoltaic parameters when the device is exposed to continuous light. Although some performance improvements may occur under light soaking, LSE introduces variability and instability that limit the accuracy of power output assessments. The mechanisms behind LSE include ion migration, trap defect passivation, and charge accumulation, all of which can influence the transient electrical behavior of PSCs. Recent advancements in interfacial engineering, material doping, and surface passivation have shown promise in mitigating the effects of LSE and improving the photo-stability of these devices.
Together, J-V testing and the study of LSE are crucial in advancing solar technology. While J-V testing provides standardized and quantitative evaluation, understanding LSE is essential to ensure long-term performance and reliability. As the PV industry continues to grow, integrating both approaches will be key to optimizing next-generation solar cells for commercial deployment.