Proceedings of Online Meetup: Contemporary Stability Challenges in Hybrid Perovskite Photovoltaics (SCHP)
Publication date: 14th April 2020
We report on the improved operational stability of unencapsulated perovskite solar cells (PSCs) aged in ambient atmosphere at elevated temperatures (70 °C) for >1000 hours under constant illumination and bias at 30-50% relative humidity. We identify a previously unseen interfacial degradation mechanism concerning the use of an interlayer, MoOx, which was originally added to increase operational stability. Specifically, the hole-transport layer/MoOx interface buckles under illumination at 70 °C. This buckling leads to delamination and rapid losses in short-circuit current density corresponding to an average t80 of ~55 hours. By judicious evaluation of various hole-transport layers, interlayers, and contacts, we find that replacing the MoOx with a VOx interlayer, regardless of the other components in the solar cell, alleviates this buckling issue due to its higher activation barrier towards crystallization, leading to significant gains in PSC operational stability. Unencapsulated devices aged in ambient atmosphere with a VOx interlayer retain 71% of initial PCE on average after 1100 hours of constant illumination and bias at 70 °C (t80 ~645 hours). Currently, this is the highest temperature reported for the operational stability of unencapsulated n-i-p PSCs aged in ambient atmosphere. These gains in operational stability for unencapsulated PSCs in ambient atmosphere demonstrate that stabilizing interfaces within the solar cell is critical to bypass degradation pathways that emerge at higher operating temperatures. A systematic understanding of the degradation mechanisms in PSCs will allow for targeted acceleration testing to speed the deployment of low-cost, long-lasting electricity generation under realistic operating temperatures.
This work was authored in part by the Alliance for Sustainable Energy, LLC, the manager and operator of the National Renewable Energy Laboratory for the U.S. Department of Energy (DOE) under Contract No. DE-AC36-08GO28308. Work at NREL was funded by U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Office under the De-risking Halide Perovskite Solar Cells Program and based upon work under the Agreement Number DE-EE0008174. Work at Colorado School of Mines was supported by the U.S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO) Agreement Number DE‐EE0008167. Work performed at Stanford Nano Shared Facilities (SNSF) and the Stanford Nanofabrication Facility (SNF) was supported by the National Science Foundation under award ECCS-1542152. T.H.S. acknowledges the Department of Chemistry and the Office of Graduate Studies at the Colorado School of Mines for financial support. A.E.M. was supported by the Director’s Fellowship program at the National Renewable Energy Laboratory.
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.