Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.063
Publication date: 18th July 2023
The need for self-powered electronics is progressively growing in parallel to the flourishing of the Internet of Things (IoT). Although batteries are dominating as powering devices, other small systems are attracting attention, such as piezoelectrics, thermoelectrics and photovoltaics. These last ones can be adapted from their classical outdoor configuration to work preferentially under indoor illumination, i.e. through the harvesting of the spectrum emitted by LEDs and/or fluorescent lamps. However, crystalline silicon, the classical photovoltaic material for solar panels, has a bad gap not suitable for ensuring good efficiency with such spectra. Other semiconductors, with wider band gaps, can come into play for this task. Still, the materials of choice, having to be integrated within households, should also satisfy the criterion of non-toxicity, as well as maintain low-costs of production. While lead- based halide perovskites cannot represent a valuable solution for this scope, due to the strong environmental and health concerns associated to the presence of Pb, analogous compounds based on the heaviest pnictogen, i.e. bismuth, could work as sustainable light-harvesters for indoor photovoltaic devices.
In this contribution, we will show our most recent results obtained from the integration of the double perovskite Cs2AgBiBr6 in carbon-based perovskite solar cells, devices characterized by a high degree of sustanaibility, also due to the use of recycled materials within the carbon eletrodes. Similar technologies might have interesting applications for powering the IoT within private households or other indoor environments.
We will also show our studies on the use of a perovskite-inspired material, the oxyhalide BiOI, produced from a fully aqueous-based deposition method, as photoanodes for the oxygen reduction reaction as well as for the light-driven charging of liquid electrolytes for flow cell batteries.