Innovations in Measurements and Standards | Innoget

Korea Institute of Energy Research posted this:

Researchers at the Korea Institute of Energy Research (KIER) have developed an innovative device for controlling sample temperature during photoelectric and solar cell measurement. This technology specifically relates to a device for maintaining a constant temperature of solar cell samples in a procedure for measuring photoelectric and solar cell characteristic. This advanced technology is particularly valuable in response to the increasing attention being placed on alternative next-generation clean energy sources. As such, greater scientific research focus is being paid to fossil fuel alternatives, such as solar cells. Solar cells directly converting sunlight into electric energy have various merits such as avoidance of contamination, infinite resource and semi-permanent lifespan, and are thus anticipated as an energy source capable of solving the problem of energy depletion. Solar cells are semiconductor devices for solar energy generation. Performance indicators determine the value of a solar cell, for example; spectral responsibility, open circuit voltage, short circuit voltage, short circuit current, conversion efficiency and maximum output. These performance indicators are determined by measuring photoelectric characteristics using a test called Standard Test Condition (STC). For common crystalline silicon solar cells, which have relatively good thermal conductivity, and thin film solar cell, the indirect method of controlling sample temperature is fully efficient to due effective heat exchange between a sample stage and a sample. However, in the case of a thin film solar cell using a thick glass substrate or a solar cell that has an additional jig for measurement, the heat exchange between a sample stage and a sample is not effective. The inefficiencies experienced when measuring solar cell properties, of some solar cells, arise due to the difficulty encountered when attempting to maintain the temperature of the measurement target solar cell at values similar to those prescribed by STC conditions. Also, in the case of a dye-sensitized solar cell, which requires a relatively long time for measurement, the cell must be exposed to light for a prolonged period, making temperature measurements difficult to attain as well as suffering issues because of prolonged photo-irradiation. The technology, developed and presented by the KIER, has been conceived to solve the problems related to controlling sample temperatures during photoelectric and solar cell measurements. This advanced technology offers a refined, indirect, method for controlling sample temperatures, and may be used for measuring various photoelectric and solar cell characteristics.