Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
Publication date: 6th February 2024
Narrow bandgap perovskite solar cells based on mixed lead-tin perovskites tend to suffer from poor stability under operating conditions. This impedes the development of stable all-perovskite multi-junction solar cells. We explore the causes of this instability under extended periods of combined 65°C thermal and illumination stressing using a range of structural, optical, and electronic characterization techniques on lead-tin perovskite films, half-stacks and devices.
We show that the bulk phase, absorbance, mobility and background carrier density of lead-tin perovskite films are stable on timescales that exceed those of device degradation. We also find that non-radiative recombination rates in the perovskite increase moderately during the first few hundred hours of stressing. However, through a combination of device simulations and variable rate current-voltage (J-V) scanning we demonstrate that this change can only account for a small portion of the observed device performance loss.
Ultimately, we identify a rapidly increasing impact of mobile ions during aging as the major cause of the observed device degradation. A close investigation of the J-V characteristics of devices reveals the formation of a charge extraction barrier during aging, which is hugely reduced in very fast J-V scans where mobile ions are less able to aggregate at interfaces. We quantify the increasing impact of mobile ions on device performance during aging, and furthermore demonstrate that this impact can be significantly mitigated by an alternative hole transport layer choice.
Over longer timescales, we additionally identify the growth of a non-perovskite degradation phase as well as HTL-dependent changes in optoelectronic properties. We quantify the impact of these changes on device performance in comparison to the effects from mobile ions, demonstrating that the dominant effect can change with aging time and device architecture. Thus, we are able to closely identify the various processes that limit the stability of lead-tin perovskite solar cells and make recommendations to overcome these challenges.
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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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