Wednesday, 22 May 2019

Opvius improves low-light performance of OPV devices

OPV devices suitable for IoT applications in low-light levels

15 Mar 2018 | Editor

Opvius has announced the findings of an internal research and development project on OPV performance in low-light. Opvius states that previously performance of OPV devices in low-light was subjected to strong fluctuations, even within the same production batch, thus causing low yields and making industrial applications difficult.

The internal research and development project demonstrated that efficient energy extraction by OPV modules under low light is directly associated with leakage current or so-called shunt resistance. It has also shown that module performance under low light diminishes disproportionately as leakage current increases.

Nevertheless, these features are not generally connected with the general capacity measured under standard test conditions (STC). Rather, when there is a great amount of leakage current, capacity sinks as the light intensity diminishes, but this does not necessarily lead to a conspicuous in the "STC" capacity.

This also means that a large spread of leakage current results in a lower yield of module production if one takes low light into account as a quality feature. In the end, such a restriction on yield leads to reduced applicability in the low-light segment and makes commercial applications in this environment difficult.

As a result of the Opvius investigations, the performance of OPV modules under low light has been improved. This further development also has a generally positive impact on all areas where Opvius OPV solutions are applied.

OPV modules also prove their worth in outdoor use when the level of light radiation is low, for example in shadow or at sunrise or sunset. Last but not least, this optimization offers new possibilities in the "consumer electronics" and "wearables" segments.

"As a result of the optimization of our production processes and continuing to use all our standard materials, we have succeeded in restructuring production so that virtually all the modules in a manufacturing batch demonstrate identical and also lower leakage current. Thus with a lower light intensity of just 100 lux, we can theoretically still guarantee the highest possible voltage"
"This result is attributable to a number of adaptations along our entire process chain. The fact that we have optimized the manufacturing process of all the modules in a given batch is of great interest because the yield regarding low light requirements can be clearly improved."

Dr. Sebastian Meier, Head of Research & Development at Opvius

"Now, even in extremely low light, our modules generate sufficient power to supply small electronic components. Therefore, with their easy integration, OPV solutions are also attractive in the context of the Internet of Things (IoT), where millions of small and tiny devices, such as sensors and transmitters, are linked and can communicate with each other. Energy-independent operation, making disposable batteries superfluous, not only reduces the strain on the environment, but also saves the considerable costs of service and repairs."

Hermann Issa, Senior Director Business Development & Sales at Opvius


About Opvius

OpviusS GmbH, founded in 2012 and located in Nuremberg and Kitzingen (INNOPARK Kitzingen), is among the world leaders in the field of organic photovoltaics. Opvius produces organic solar cells with a focus on client specific solutions. In addition, the company is also active in the field of research and development, in order to continue to provide its clients with creative and innovative solutions. In this regard, OPVIUS uses a unique production process, combining printing, lamination, and laser techniques. This advanced technology is easily scalable and allows the production of the utmost individual, customer-specific designs. OPVIUS also helps clients with system solutions in order to integrate OPVs into already existing or new products.

Source: Opvius

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