Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Achieving long-term stability of perovskite solar cells is arguably the most important challenge required to enable widespread commercialization. Understanding the impact of the perovskite material quality on device stability is critical to overcoming this hurdle. Surprisingly, we found that the fabrication methods had significant impact on the overall perovskite stability. The commonly employed “DMF/DMSO” solvent system preparation method resulted in poor crystal quality and microstructure, which ultimately lead to an inferior material stability compared the “DMF/acid” or “DMF/DMA” processing method, proposed in this work. These fabrication methods exhibited a high degree of texturing and crystallinity. Furthermore, we observe residual DMSO in the perovskite film, which could adversely affect the stability of the material. In this work, we introduce a high temperature “DMSO-free” processing method that utilizes DMACl to accurately control the perovskite precursor phases. By precisely controlling the 2H to 3C crystallization sequence rate, we can tune the size, texturing, orientation (corner-up vs face-up) and crystallinity of the crystal grain to extend the long‑term operational lifetime of the (FA,Cs)Pb(Br,I)3 perovskite system. We investigated the impact of these various crystal quality film on the stability of the perovskite by decoupling the main degradation mechanisms (humidity, heat and light). A population of encapsulated devices showed a t80 lifetime, for the stabilized PCE, of 1190 h as median value and a champion device showing a t80 of 1410 h, under simulated sun light at 65 °C in air, under open‑circuit conditions, in contrast to a median value of t80 = 1040 h and a champion t80 = 780 h for conventional DMF/DMSO devices. Our work introduces an innovative processing method that allows higher overall perovskite device stability, by controlling the intermediate phases domains during the perovskite formation. This work highlights the importance of material quality in order to achieve long-term operational stability of perovskite solar cells.
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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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