Publication date: 23rd October 2020
Perovskite solar cells (PSCs) efficiency skyrocketed from 3.8% to 25.5% in less than a decade. Although the achieved PSCs efficiency is impressive, the long-term device operational stability is still a distant goal.
In recent literature, it has been shown that the hole-transport material (HTM) can improve dramatically PSCs stability in the standard n-i-p device configuration. For this purpose, the HTM should provide decent charge transport properties without additional doping, must be chemically inert towards perovskite, and have low gas permeability to prevent leakage of the perovskite decomposition products from the absorber layer. In this regard, a family of conjugated polymers is of great interest, since these are intrinsic semiconductor materials with an easily tunable structure and physicochemical properties. Multiple reports presented the design of HTMs based on conjugated polymers for PSCs with high efficiency and improved stability, though the selection of the material structures still looks purely empiric. In order to perform a rational design of polymer-based HTMs for improving the efficiency and stability of perovskite solar cells, some basic guidelines have to be defined.
In this work, we systematically explored a broad range of conjugated polymers as HTMs to reveal the impact of their molecular structure and properties on the PSCs performance and operational stability. The selected set of the polymers comprises materials with various backbone structures, different solubilizing side chains, and HOMO energy levels varied from -5.8 to -5.1 eV. We showed that PSCs with high efficiency of up to 18.9% can be fabricated using the best polymeric HTMs without additional doping. A systematic study of the device aging behavior within 1000 h under continuous light soaking was performed and we identified the series of polymers comprised of octyloxy-substituted benzooxadiazole and/or carbazole units enabling long-term operational stability of PSCs.
The obtained results allowed us to establish some molecular structure – photovoltaic performance – operational stability relationships, which may guide further rational deisign of polymer-based HTMs for efficient and stable perovskite photovoltaics.
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.