Regensburg 2022 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 16: Thin Film Applications 2
DS 16.1: Vortrag
Mittwoch, 7. September 2022, 11:00–11:15, H14
High Open-Circuit Voltage Cs2AgBiBr6 Carbon-Based Perovskite Solar Cells Via Green Processing of Ultrasonic Spray-Coated Carbon Electrodes from Waste Tire Sources — •Fabian Schmitz and Teresa Gatti — Center for Materials Research, Justus Liebig University, Giessen, Germany
Although top-notch lead-based perovskite solar cells (PSCs) achieve power conversion efficiencies >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 as well as the hole-transport material by substituting both with a conductive carbon material to create carbon-based PSCs (C-PSCs). 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.
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. For our sustainable approach, we started from a carbon material obtained from the hydrothermal recycling of waste tires and dispersed it in isopropanol. This additive-free 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.