Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.104
Publication date: 23rd September 2021
The operational stability of perovskite solar cells (PSCs) is imperative for their commercialization. Although PSCs have almost reached the climax of device performance, their long-term operational stability remains a primary challenge for real-world applications. Despite significant progress through the engineering of the bulk and the interface layer in device configuration, the mechanisms underlying the degradation of HaPSCs under continuous illumination and heat stresses are still ambiguous. We report on the operational stability of devices made with PTAA; (PCE ≈19.32%) or sputtered NiOx (PCE≈15.60%) as a hole-transport layer (HTL) under light (for >1000 h) at 20, 60, and 85 °C to unravel the degradation mechanisms. Our work suggests that degradation is initiated mainly by the deterioration of the HaP bulk at columnar inter-grains and the interfacial junction with the release of I2 gas, which worsens the interface quality. Degradation of the PTAA device was accelerated by the interface deterioration and bulk decomposition initiated by the formation of voids and PbI2 via iodine migration from defective regions at the columnar grain boundaries with the release of I2 gas. The NiOx devices significantly improved the device stability with suppression of the HaP bulk degradation by alleviating internal defect dynamics. Capacitance–voltage analysis showed that the PTAA device develops a much wider defective interface layer than the NiOx device, driven mainly by the chemical reaction of iodine with the interfacial layer. Thus, our results reveal that although the cracking of columnar inter-grains and defective spots in the perovskite bulk is the main origin of device degradation, the nature of the HTL also partly contributes catalysing bulk degradation.
This work was supported by Yazaki Memorial Foundation for Science and Technology.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
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.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.