Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.211
Publication date: 23rd September 2021
Inverted p-i-n perovskite solar cells (PSCs) are pivotal for fabricating perovskite-based tandem photovoltaics with the highest performance. However, severe non-radiative recombination at the perovskite/electron transport layer and at the grain boundaries (GBs) still limits their open-circuit voltage (VOC) and fill factor (FF) as compared to their n-i-p counterparts. We introduce a novel dual passivation approach using phenethylammonium chloride (PEACl) to simultaneuosly passivate the GBs and the perovskite/C60 interface by using PEACl:PbCl2 as the additive and PEACl for surface treatment, respectively. [1] Employing the self-assembled monolayer [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz) as hole-transporting layer and a methylammonium-free Cs0.18FA0.82PbI3 perovskite absorber (bandgap ~1.57 eV), we achieve a substantially enhanced charge carrier lifetime and quasi-Fermi level splitting (~63 mV enhancement) compared to reference devices. By analyzing X-ray diffraction, cathodoluminescence, scanning electron microscopy, X-ray/ultraviolet photoelectron spectroscopy and Kelvin probe force microscopy measurements, we attribute the positive effects to the formation of a thin heterogeneous 2D Ruddlesden Popper (PEA)2(Cs1−xFAx)n−1Pbn(I1−yCly)3n+1 phase with n ~1-2 at the GBs and film surface. This leads to efficient chemical passivation of GB and surface defects as well as additional electronic passivation at the perovskite/C60 interface due to hole-blocking. Our dual passivation strategy results in one of the highest reported PCEs for p-i-n PSCs of 22.7% with a remarkable VOC and FF of 1.162 V and 83.2%, respectively. In addition, the dual passivated PSCs exhibit a strongly enhanced activation energy for ion migration together with an enhanced stability under light illumnation and prolonged heat treatment.
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.