A chain is as strong as its weakest link – Stability study of MAPbI3 under light and temperature

Holzhey, Philippe; Yadav, Pankaj; Turren‐Cruz, Silver‐Hamill; Ummadisingu, Amita; Grätzel, Michaël; Hagfeldt, Anders; Saliba, Michael

doi:10.1016/j.mattod.2018.10.017

Cited by 70 publications

(79 citation statements)

References 43 publications

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“…The CLSM can map the emissive chemical constituents spatially by exploiting the differences in their emission spectra . The emission peak between 500 and 550 nm is identified as due to PbI 2 and assigned as the green color scale, by contrast, the emission between 700 and 800 nm is attributed to perovskite and assigned as the red color scale . As shown in the CLSM images of the without MA perovskite films (Figure e–i), we detected small amount of PbI 2 (shown in green), which were presented in the boundaries of perovskite (shown in red).…”

Section: Champion Device Performance Of Perovskite Solar Cells With Dmentioning

confidence: 84%

Stable and High‐Efficiency Methylammonium‐Free Perovskite Solar Cells

et al. 2020

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Organic–inorganic metal halide perovskite solar cells (PSCs) have achieved certified power conversion efficiency (PCE) of 25.2% with complex compositional and bandgap engineering. However, the thermal instability of methylammonium (MA) cation can cause the degradation of the perovskite film, remaining a risk for the long‐term stability of the devices. Herein, a unique method is demonstrated to fabricate highly phase‐stable perovskite film without MA by introducing cesium chloride (CsCl) in the double cation (Cs, formamidinium) perovskite precursor. Moreover, due to the suboptimal bandgap of bromide (Br−), the amount of Br− is regulated, leading to high power conversion efficiency. As a result, MA‐free perovskite solar cells achieve remarkable long‐term stability and a PCE of 20.50%, which is one of the best results for MA‐free PSCs. Moreover, the unencapsulated device retains about 80% of the original efficiencies after a 1000 h aging study. These results provide a feasible approach to enhance solar cell stability and performance simultaneously, paving the way for commercializing PSCs.

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Section: Champion Device Performance Of Perovskite Solar Cells With Dmentioning

confidence: 84%

Stable and High‐Efficiency Methylammonium‐Free Perovskite Solar Cells

et al. 2020

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“…While the new research efforts utilizing multicomponent or chemical composition engineering have led to several best certified efficiencies in the NREL chart as well as enhanced stability, some researchers are developing strategies to simplify the perovskite composition to the basic ABX 3 formula (i.e., MAPbI 3 , α,δ‐FAPbI 3 , CsPbI 3 ) . At the current stage, perovskite solar‐cell stability is still far from reaching the >25 years lifetime, but recent studies have shown that ABX 3 perovskites can in fact present enhanced stability and can be more attractive to industry due to their simplicity in synthesis…”

Section: Defect Passivation In Metal Halide Perovskitesmentioning

confidence: 99%

Reducing Detrimental Defects for High‐Performance Metal Halide Perovskite Solar Cells

2020

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In several photovoltaic (PV) technologies, the presence of electronic defects within the semiconductor band gap limit the efficiency, reproducibility, as well as lifetime. Metal halide perovskites (MHPs) have drawn great attention because of their excellent photovoltaic properties that can be achieved even without a very strict film‐growth control processing. Much has been done theoretically in describing the different point defects in MHPs. Herein, we discuss the experimental challenges in thoroughly characterizing the defects in MHPs such as, experimental assignment of the type of defects, defects densities, and the energy positions within the band gap induced by these defects. The second topic of this Review is passivation strategies. Based on a literature survey, the different types of defects that are important to consider and need to be minimized are examined. A complete fundamental understanding of defect nature in MHPs is needed to further improve their optoelectronic functionalities.

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“…[9,10] This technology is expected to successfully contribute to the enormous challenge of future power supply from sustainable energy sources. Nitrogen has been also exploited as inert species [20][21][22][23][24] but its role is still unfocused. Solutions to guarantee the durability of products are mandatory and can be numerous, if the problem is addressed from different perspectives.…”

mentioning

confidence: 99%

“…[24,26] A rationalization of the phenomena needs to embody heating and thermal cycles to preserve the material integrity and/or the structural reversibility versus temperature. This is particularly needed for small grained perovskite layers, on one hand used to implement pinhole-free coverages, but, on the other hand, offering extended lattice discontinuities due to the high surface to volume ratio.…”

mentioning

confidence: 99%

Nitrogen Soaking Promotes Lattice Recovery in Polycrystalline Hybrid Perovskites

Alberti

Deretzis

Mannino

et al. 2019

Advanced Energy Materials

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wide dissemination, and high technological throughput. [8] As a unique event in the landscape of solar energy harvesting, perovskite solar cells have experienced an increment of their power conversion efficiency by ≈8% (from 13.4% to 23.7%) in the last 5 years. [9,10] This technology is expected to successfully contribute to the enormous challenge of future power supply from sustainable energy sources. However, the well-known structural instability of hybrid perovskites under working conditions limits a real market uptake of all the related technologies. Solutions to guarantee the durability of products are mandatory and can be numerous, if the problem is addressed from different perspectives.Within the possible approaches to stabilize the perovskite lattice and its behavior under illumination, recent efforts have focused on introducing various treatments, [11,12] molecules, or additives, [13][14][15][16][17][18][19] through different procedures. Nitrogen has been also exploited as inert species [20][21][22][23][24] but its role is still unfocused. The existing (direct or indirect) findings in the literature stimulate the idea of beneficially using N 2 molecules in technological solutions, if their role is persuasively afforded. [25] N 2 molecules are small, safe, and easy to apply.Related to the material stability, we emphasize that the plethora of perovskites produced in different laboratories, with preparation procedures changing from lab to lab and from time to time, ask for treatments that take care and, in a certain extent, reset the starting conditions in a convenient and reproducible manner. This is particularly needed for small grained perovskite layers, on one hand used to implement pinhole-free coverages, but, on the other hand, offering extended lattice discontinuities due to the high surface to volume ratio. In addition to morphology and environment, temperature-related effects are unavoidable during device operation. [24,26] A rationalization of the phenomena needs to embody heating and thermal cycles to preserve the material integrity and/or the structural reversibility versus temperature.In this framework, we argue that nitrogen species have an active role in the stabilization of all the exposed methylammonium lead iodide (MAPbI 3 ) surfaces via their action at grain shells. This conclusion is independent of the particular On the basis of experiment and theory, a general paradigm is drawn that reconsiders N 2 not simply being an inert species but rather an effective healing gas molecule if entering a methylammonium lead iodide (MAPbI 3 ) layer. Nitrogen is soaked into polycrystalline MAPbI 3 via a postdeposition mild thermal treatment under slightly overpressure conditions to promote its diffusion across the whole layer. A significant reduction of radiative recombination and a concurrent increase of light absorption, with a maximum benefit at 80 °C, are observed. Concomitantly, the current of holes drawn from the surfaces with nanometer resolution through a biased tip is raised by a factor of 3 un...

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A chain is as strong as its weakest link – Stability study of MAPbI3 under light and temperature

Cited by 70 publications

References 43 publications

Stable and High‐Efficiency Methylammonium‐Free Perovskite Solar Cells

Stable and High‐Efficiency Methylammonium‐Free Perovskite Solar Cells

Reducing Detrimental Defects for High‐Performance Metal Halide Perovskite Solar Cells

Nitrogen Soaking Promotes Lattice Recovery in Polycrystalline Hybrid Perovskites

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