Low-Cost Three-Quadrant Single Solar Cell I-V Tracer

Abstract

An I-V curve measurement technique is one of the most important techniques available for characterising photovoltaic cells. Measuring an accurate I-V curve at the single-cell level is a challenging task because of the low voltages and high currents implied, requiring the management of very low impedances. In this paper, the authors propose a low-cost device for I-V curve measurements of single (or small amounts) of cells in a series based on the charge transfer between two capacitors of equal capacitance. Our measurement strategy allows us to trace the usual first quadrant curve (the normal working region of solar cells) as well as the second and fourth quadrants of the I-V curve, which are quite important for research purposes. A prototype was built to demonstrate the feasibility and successful measurements of the three-quadrant I-V curve, obtained for more than 20 different cells. To use the device in a laboratory, without depending on the solar irradiation, a modular platform was 3D-printed, integrating a board with infrared LEDs as irradiating devices, and housing (to place the solar cell under test). The result is a useful low-cost setup for three-quadrant I-V curve tracing that works as expected.

Synthetic Dataset of Electroluminescence Images of Photovoltaic Cells by Deep Convolutional Generative Adversarial Networks

“…For the first, there are some public datasets available in the bibliography [20], but they do not include information about the IV curve, since it is not easy to measure the individual curve of a single PV cell. To solve this problem, we had to obtain the data using a specific technique developed previously [21] and following a manual process in the laboratory.…”

“…To measure the IV curve, we used a device specifically designed to measure the values of current and voltage of a single cell [21]. This device (Figure 2b) provided voltage and current values to build the IV curve of the cells.…”