Grain boundary of polycrystalline thin film perovskite cell

While similar in crystallinity, the topography is quite different (Figure 1b,e).Films produced by the AS process consist in most cases of tightly packed crystallites providing a good surface coverage (Figure 1b).They have an average thickness of the perovskite capping layer of 500 nm, the roughness is in the range of 10–20 nm (Figure …

Physical Passivation of Grain Boundaries and Defects in Perovskite ...

While similar in crystallinity, the topography is quite different (Figure 1b,e) lms produced by the AS process consist in most cases of tightly packed crystallites providing a good surface coverage (Figure 1b).They have an average thickness of the perovskite capping layer of 500 nm, the roughness is in the range of 10–20 nm (Figure …

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High-efficiency solution-processed perovskite solar cells with millimeter-scale grains | Science …

Here, we report a solution-based hot-casting technique to achieve ~18% solar cell efficiency based on millimeter-scale crystalline grains, with relatively small variability (~2%) in the overall PCE from one solar cell to another. Figure 1A schematically describes our hot-casting process for deposition of organometallic perovskite thin films.

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Photo-enhanced ionic conductivity across grain boundaries in ...

The impact of light on grain boundaries has been studied for polycrystalline silicon, demonstrating reduced grain boundary resistance when operated as a photodetector or solar cell under high ...

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Plasmon-induced trap filling at grain boundaries in perovskite solar cells …

The deep-level traps induced by charged defects at the grain boundaries (GBs) of polycrystalline organic–inorganic halide perovskite (OIHP) films serve as major recombination centres, which ...

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The role of grain boundaries in perovskite solar cells

Polycrystalline PVSK films are grown by low temperature solution processes that results in the formation of sub-micron scale grains and consequent grain …

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Elimination of grain surface concavities for improved perovskite thin-film …

The surface of individual grains of metal halide perovskite films can determine the properties of heterointerfaces at the microscale and the performance of the resultant solar cells. However, the ...

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Benefit of Grain Boundaries in Organic–Inorganic …

The past 2 years have seen the uniquely rapid emergence of a new class of solar cell based on mixed organic–inorganic halide perovskite. Grain boundaries are present in polycrystalline thin film solar cell, and they …

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Engineering intrinsic flexibility in polycrystalline perovskite film by ...

A metal halide perovskite (MHP) thin film processed at low temperature is uniquely suited for flexible perovskite solar cells owing to its characteristic low formation energies. However, the intrinsic brittleness (low toughness) of MHP crystals restrict the mechanical endurance, particularly in polycrystalline MHP films enriched with grain …

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Single crystal Perovskite-Based solar Cells: Growth, Challenges, …

Fig. 1 a shows the highest cell efficiency for single-junction solar cells achieved in research studies, where GaAs-based single-junction solar cells exhibit the maximum stability. Similarly, Fig. 1 b shows the certified efficiency chart for single and polycrystalline single-junction solar cells, indicating that GaAs thin-film single-crystal …

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Observation of Grain Boundary Passivation and Charge Distribution in Perovskite Films …

Owing to the polycrystalline nature of hybrid perovskite thin films, the trap states in grain boundaries (GBs) introduced by charged defects play an important role in determining the charge collection efficiency and have a significant impact on their optoelectronic properties. Herein, we show the direct imaging of the GB passivation of …

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Subgrain Special Boundaries in Halide Perovskite Thin Films …

Photoluminescence microscopy reveals subgrain special boundaries in FAPbI3 perosvkite thin films that restrict carrier diffusion and serve as nonradiative recombination sites. These subgrain boundaries, which cannot be observed by conventional AFM or SEM measurements of grain-boundary grooves, may explain why …

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The Role of Grain Boundaries in Organic–Inorganic Hybrid Perovskite Solar Cells …

2.1 Debate on the Charge Carrier Dynamics in GBs Since 2015, many works on the GBs in polycrystalline perovskite thin films have been reported, but up to now, there is still controversy regarding the effect of GBs on recombination. [11, 37-41] The negative impact of GBs on carrier transport in hybrid perovskites has been indirectly demonstrated by the …

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Delineation and Passivation of Grain‐Boundary Channels in …

A simple, generic method for delineating grain‐boundary (GB) channels in metal halide perovskite (MHP) thin films for scanning electron microscopy (SEM) observation is demonstrated, thereby enabling more accurate grain‐size measurements. This entails dipping the film in dichloromethane (DCM), followed by a moderate heat‐treatment, …

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Perovskites: Between the Grains

Perovskite thin-film semiconductors are a class of polycrystalline materials that have demonstrated early promise toward lower-cost, large-area solar cells. The exact role of grain boundaries in perovskites is still not robustly understood.

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Observation of Grain Boundary Passivation and …

Owing to the polycrystalline nature of hybrid perovskite thin films, the trap states in grain boundaries (GBs) introduced by charged defects play an important role in determining the charge collection …

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Long-range charge carrier mobility in metal halide perovskite thin-films …

In polycrystalline thin-films, charge transport is additionally influenced by scattering/trapping processes 27,28 that can depend upon charge density, both within the grains and at grain ...

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The role of grain boundaries in perovskite solar cells

As the PVSK thin films are grown by low temperature solution processes, the formation of polycrystalline films with grain boundaries (GBs) is inevitable. As a …

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Defects engineering for high-performance perovskite solar cells

Although the effects of grain boundaries in perovskite films on the device performance are still not completely clear, perovskite films with large grains have been demonstrated to exhibit lower ...

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[PDF] Subgrain Special Boundaries in Halide Perovskite Thin Films ...

Photoluminescence microscopy reveals subgrain special boundaries in FAPbI3 perosvkite thin films that restrict carrier diffusion and serve as nonradiative recombination sites. These subgrain boundaries, which cannot be observed by conventional AFM or SEM measurements of grain-boundary grooves, may explain why …

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Enabling full-scale grain boundary mitigation in polycrystalline ...

There exists a considerable density of interaggregate grain boundaries (GBs) and intra-aggregate GBs in polycrystalline perovskites. Mitigation of intra-aggregate GBs is equally notable to that of interaggregate GBs as intra-aggregate GBs can also cause detrimental effects on the photovoltaic performances of perovskite solar cells (PSCs). …

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High grain boundary recombination velocity in polycrystalline metal halide perovskites

The large deviation of the S GB values for different grains indicates a large grain-to-grain heterogeneity in polycrystalline perovskite thin films in terms of GB recombinations (). Sulfate treatment does not significantly reduce the GB recombination, as it renders a similar average S GB of 3100 ± 950 cm/s.

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Recombination in Perovskite Solar Cells: Significance of Grain Boundaries…

In polycrystalline perovskite thin films, defects or impurities are likely to be concentrated at grain boundaries (GBs) and at film surfaces. The surface of the photoactive perovskite in PSCs is covered with ETL and HTL, which forms an interface.

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The Role of Grain Boundaries in Organic–Inorganic …

1 Introduction. The efficiency of perovskite solar cells (PSCs) dramatically increases from 3.8% [] for the first time in 2009 to the current 26.1% (certified), [2, 3] which is already close to the 26.1% of single crystal (non …

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Recombination in Perovskite Solar Cells: Significance …

Trap-assisted recombination, despite being lower as compared with traditional inorganic solar cells, is still the dominant recombination mechanism in perovskite solar cells (PSCs) and limits …

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