Monolithic self-sustaining photovoltaic (PV)/battery for autonomous connected devicesCopyright: Li-C. Kin
“Internet of Things” and smart house smart cities concepts require a multitude of sensors that make it imperative to have a cheap, independent and all-inclusive integrated power solution for low powered, constantly running wireless electronics. Development of this type of devices is promoted in a collaborative project of IEK-5 and IEK-9 supported by a HITEC fellowship.
This project focuses on the development of a compact, self-sustaining monolithic integrated PV (solar cells/modules)/batteries for powering low-power electronics through a common contact layer . The resulting 3 terminal device may be voltage matched or non-matched. Voltage matched devices are capable of self-sustained operation without driving electronics, while voltage unmatched devices enables the application of a much larger scope of materials and technologies of both battery and PV cells to be integrated.
From the PV side, the core of the project will be dedicated to a development of prototypes of PV-battery assemblies with high efficiency perovskite and silicon heterojunction solar cells and modules. From the battery side, the core topic during the integration is to develop an integration strategy which uses either a solid state electrolyte or a gel type electrolyte that can handle the high current and voltage profiles of the PV cells.
 S. N. Agbo, T. Merdzhanova, S. Yu, H. Tempel, H. Kungl, R. A. Eichel, U. Rau, O. Astakhov, “Development towards cell-to cell monolithic integration of a thin-film solar cell and lithium-ion accumulator”, Journal of Power Sources 327, (2016) 340