Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.117
Publication date: 20th April 2022
Although top-notch lead-based perovskite solar cells (PSCs) achieve power conversion efficiencies (PCEs) >25%, they are still hindered from commercial implementation by their low environmental stability, high toxicity and optimizable costs. The latter could be reduced by eliminating the metal back electrode, typically consisting of vacuum-deposited gold, as well as the hole-transport material by substituting both with a conductive carbon material to create carbon-based PSCs (C-PSCs).[1] Furthermore, the utilization of perovskite materials based on other metallic compounds could tackle the other two issues of stability and toxicity. A promising example that combines both high environmental stability and low toxicity is the double perovskite Cs2AgBiBr6. On the one hand, this material is characterized by an advantageous carrier lifetime of more than 1 µs.[2] On the other hand, its large indirect bandgap,[3] fast surface charge carrier recombination[4] as well as strong electron-phonon coupling and exciton binding energy[5] suppress the PCE of Cs2AgBiBr6-based PSCs what emphasizes the need of further compositional or morphological engineering to overcome those drawbacks.
In our work, we present the deposition of “green” carbon electrodes onto Cs2AgBiBr6 thin films via high-throughput ultrasonic spray coating to prepare lead-free C-PSCs. To achieve a sustainable approach, we started from a carbon material obtained from the hydrothermal recycling of waste tires and dispersed it in isopropanol to create an additive-free carbon ink. This ink worked as a precursor for the upscalable ultrasonic spray deposition method to fabricate carbon electrodes under ambient atmosphere and at a low substrate temperature. Through this procedure we obtained C-PSCs with record open-circuit voltages of >1.2 V, which might represent ultra-cheap solutions to power the indoor Internet of Things ecosystem.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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