Methylamine-induced defect-healing and cationic substitution: a new method for low-defect perovskite thin films and solar cells

Qin, Tianxu; Xie, Lisha; Liao, Kejun; Li, Tingshuai; Hao, Feng

doi:10.1039/c9tc03490k

Cited by 50 publications

(34 citation statements)

References 123 publications

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“…[27][28][29][30][31][32] XRD patterns, testified a complete conversion of precursors into perovskite phases. The SEF-SC protocol, avoids the usage of toxic and dangerous solvents, solving an important step of perovskite solar cell technology.…”

Section: Wwwadvmattechnoldementioning

confidence: 99%

Eco‐Friendly Spray Deposition of Perovskite Films on Macroscale Textured Surfaces

Sansoni

Bastiani

Aydın

et al. 2020

Adv Materials Technologies

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are directly realized on top of a silicon bottom cell. Utilizing commercial crystalline silicon (c-Si) wafers brings a technological challenge since the perovskite device needs then to be fabricated on wafers that feature micron-scale randomly distributed pyramidal texture, an imperative characteristic for industrial c-Si solar cells for minimizing reflection losses. The PSCs owe their present prominence to their high PCE obtained via solutiondeposition techniques, which is arguably cheaper and simpler compared to conventional vacuum-based deposition for device fabrication. From this perspective, it is required to make solution-based processing of perovskite solar cells compatible with the use of micron-scale textured substrates. Among solution processing techniques, spin coating is widespread due to its process simplicity, ease of access, and because high-quality polycrystalline perovskite films can be obtained. However, this technique is not suitable for upscaling toward industrialization. Also, considering suggestions for large-scale applications in which spin coating is translated into blade coating, the application of this technique usually results in high material consumption, which is undesirable for a sustainable low-cost production. Moreover, spin coating the perovskite layer on textured silicon bottom cells represents a challenge by itself which, to date, reportedly led to poor coverage of the films resulting in low-performing tandems. [2,3] At present, 2T tandems are mainly realized following two approaches. In the first case, the c-Si bottom cell features a mirror-polished flat front surface to accommodate spin-coated perovskite films. However, this causes reflection losses in the device, which hamper the overall PCE and require additional antireflective coatings or foils. [4] In the second case, the perovskite is deposited on textured c-Si via hybrid conversion, where the perovskite precursors, lead(II) iodide (PbI 2 ) and cesium bromide (CsBr), are thermally evaporated on the c-Si bottom cell and then converted into perovskite by spin coating the organic ammonium salts (formamidinium iodide/bromide, FAI, and FABr, respectively). [2] In this case, the limiting factor is represented by fine-tuning the conversion process. Overall, both techniques strongly rely on spin coating as a deposition/ conversion method, which still represents a roadblock toward scaling-up for commercialization. Indeed, for successful PV An innovative sequential eco-friendly spray coating (SEF-SC) technique is developed to uniformly deposit metal halide perovskite films on macroscale textured surfaces, such as textured crystalline-silicon wafers. Contrasting with previous work on spray-coated perovskite solar cells, the method presented in this work completely avoids the use of toxic and dangerous solvents. Both MAPbI 3 and CsFAMAPbI 3−x Br x perovskite films deposited by SEF-SC show excellent optoelectronic properties and no phase segregation, even when synthesized in ambient conditions. Uniform perovskite coatings are obtained...

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Section: Wwwadvmattechnoldementioning

confidence: 99%

Eco‐Friendly Spray Deposition of Perovskite Films on Macroscale Textured Surfaces

Sansoni

Bastiani

Aydın

et al. 2020

Adv Materials Technologies

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“…For even more variegated compounds, such as triple or quadruple cation perovskites, predictions regarding the exact effects of MA-induced recrystallization on phase homogeneity and composition still lack substantiated experimental or calculational evidence. However, based on groundwork concerning organic cationic exchange mechanisms [11,40] and gas-based tuning of mixed halides [7], we are confident that the post-processing and/ or fabrication of well-defined multi-compound perovskite materials in both the A as well as the X site should be possible by appropriate protocols, while at the same time exploiting the benefits of the recrystallization process on morphology and stability.…”

Section: Applicability and Perspectivesmentioning

confidence: 99%

“…Various other possibilities of perovskite film formation using MA and other hydrogen halide gases have been studied [11,12], highlighting the broad applicability of this field of research. Figure 1 shows an exemplary implementation of the MA treatment for a PSC device stack deposited up to the perovskite layer.…”

Section: Introductionmentioning

confidence: 99%

Curing perovskites—a way towards control of crystallinity and improved stability

et al. 2020

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Power conversion efficiencies of lead halide perovskite solar cells have rapidly increased in the decade since their emergence, reaching 25% this year. However, reliable film uniformity and device stability remain hard to achieve and often require precise compliance with complicated protocols, which hampers upscaling towards industrial applications. Here, we explore the potential of an alternative route towards high-quality perovskite films: The reaction between a pre-existing perovskite film and methylamine (MA) gas has been shown to possess the striking ability to both improve film morphology and increase grain size drastically, boosting device performance. This post-deposition treatment could provide the means to decouple film quality from the initial deposition process, thus promising to facilitate upscaling and lowering production costs. Furthermore, such MA gas treatments show great promise regarding the stability of fabricated devices, as they open up the opportunity to reduce or even eliminate the adverse role of grain boundaries in film degradation.

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“…Over the past few years, lead halide perovskite polycrystalline films have shown a great success in a variety of optoelectronic applications. [1][2][3][4] However, the defective grain boundaries in perovskite polycrystalline films inevitably cause carrier recombination loss and deteriorate the device performance. [5] In contrast, perovskite-single-crystalline thin films show distinctive advantages because they have no grain boundaries thereby greatly reducing the trap density and show higher carrier mobility, longer carrier lifetime, and longer diffusion length.…”

mentioning

confidence: 99%

A Centrifugal‐Force‐Assisted Wet‐Etching Approach toward Top‐Down Fabrication of Perovskite‐Single‐Crystalline Thin Films

Zhang

2020

ChemistrySelect

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Organic‐inorganic hybrid halide perovskite‐single‐crystalline thin films with high quality are promising for making high‐performance optoelectronic devices, but their fabrication is still challenging, particularly for the top‐down fabrication. Here, a facile centrifugal‐force‐assisted wet‐etching strategy is used in fabricating hybrid perovskite‐single‐crystalline thin film from its single‐crystalline wafer. The film thickness can be reduced to less than 20 micrometres and the film remains high quality and flat surface. Besides, this method can be used to regenerate surface‐metamorphic perovskite single crystals. The present technique may provide an effective strategy for single‐crystalline thin film preparation for demanding device applications and it is expected that this strategy would promise high‐efficient utilization of perovskite single crystals.

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Methylamine-induced defect-healing and cationic substitution: a new method for low-defect perovskite thin films and solar cells

Abstract: Methylamine-induced defect-healing and cationic substitution was reviewed for low defect perovskite films with better crystal quality and high stability.

Cited by 50 publications

References 123 publications

Eco‐Friendly Spray Deposition of Perovskite Films on Macroscale Textured Surfaces

Eco‐Friendly Spray Deposition of Perovskite Films on Macroscale Textured Surfaces

Curing perovskites—a way towards control of crystallinity and improved stability

A Centrifugal‐Force‐Assisted Wet‐Etching Approach toward Top‐Down Fabrication of Perovskite‐Single‐Crystalline Thin Films

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