Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.038
Publication date: 20th April 2022
Mesoscopic carbon-based perovskite solar cells (CPSCs) are frequently described as a potential frontrunner for PSC commercialization, being cheap to produce, easily scaled and highly stable. However, many scale-up projects rely on γ-butyrolactone (GBL) based perovskite precursors. A psychoactive subject to legal restrictions in many countries, this introduces legislative costs at large scale and can hamper research where access is prohibited.
This work presents γ-valerolactone (GVL) and GVL-methanol (MeOH) solvent mixes as sustainable, non-toxic, green alternatives to GBL (γ-butyrolactone) in perovskite precursors [1], [2]. While GVL can directly replace GBL, MeOH addition aids in wetting, infiltration, and perovskite crystal quality. Resultant devices exhibit improved performance, reproducibility and stability, achieving a champion PCE of 14.96% in a 1 cm2 device .
Additionally, these precursors are more suited to scale-up, as they are more stable towards unwanted precipitation. This prevents equipment blockages in scaled techniques such as inkjet printing, enabling production of large-scale modules with improved performance and reproducibility as compared to standard GBL solutions. Thus far, >9% has been achieved in a 220 cm2 active area module fabricated in ambient conditions, with recent work on even larger modules also proving successful.
As well as establishing GVL-based precursors as commercially attractive, this provides an example of how green solvent engineering can be applied in the development, amelioration and scale-up of novel photovoltaics. It also provides an interesting case study, showcasing the potential for scale-up of novel perovskite technologies.
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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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