Structure, optoelectronic properties and thermal stability of the triple organic cation GAxFAxMA1−2xPbI3 system prepared by mechanochemical synthesis

Minussi, Fernando B; Silva, Lorena Araújo; Araújo, E. B.

doi:10.1039/d1cp04977a

Cited by 12 publications

(21 citation statements)

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“…Most efficient devices fabricated with HPs today employ mixed systems, including the currently most efficient perovskite solar cells. − A compositional variety of the ABX 3 HP compounds can be explored considering the mixtures of several perovskites instead of single compounds. Consequently, the component substitution effect on the characteristics of HPs and their devices has been widely evaluated. − In HPs with A-site cation substitutions, using organic cations mainly, investigations were conducted in systems of the types FA x MA 1‑ x PbI 3 , − GA x MA 1– x PbI 3 , − DMA x MA 1– x PbI 3 , − EA x MA 1– x PbI 3 , , and GA x FA x MA 1–2 x PbI 3 . In these systems, MA + , FA + , GA + , DMA + , and EA + are the methylammonium, formamidinium, guanidinium, dimethylammonium, and ethylammonium cations, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…5−13 In HPs with A-site cation substitutions, using organic cations mainly, investigations were conducted in systems of the types F A x M A 1x P b I 3 , 1 4 − 1 8 G A x M A 1 − x P b I 3 , 1 9 − 2 4 D M A x M A 1 − x P b I 3 , 2 5 − 2 7 E A x M A 1 − x P b I 3 , 2 8 , 2 9 a n d GA x FA x MA 1−2x PbI 3 . 30 In these systems, MA + , FA + , GA + , DMA + , and EA + are the methylammonium, formamidinium, guanidinium, dimethylammonium, and ethylammonium cations, respectively. These A-site organic cations are the most common and often used in HP formulations.…”

Section: Introductionmentioning

confidence: 99%

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Differing Effects of Mixed A-Site Composition on the Properties of Hybrid Lead Iodide Perovskites

2023

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Halide perovskites (HPs) appeared as a revolutionary class of relevant optoelectronic materials. Optimizing these materials involves developing mixed formulations currently used in many of the most efficient HP-based devices. Mixing A-site organic cations has been a widely used strategy to achieve the desired characteristics in these perovskites. Few of the reported works were devoted to understanding the effects of different organic cations on the properties of the resulting HPs. In the present work, we report a detailed study on the structural, thermal, and electrical properties and degradation assays in HPs with mixing A-site organic cations at the MAPbI 3 , FA 0.10 MA 0.90 PbI 3 , GA 0.10 MA 0.90 PbI 3 , and GA 0.05 FA 0.05 MA 0.90 PbI 3 compositions. The results show that the charge transport properties change consistently with the A-site cation size. However, the structure and phase transitions are unusually affected by the composition, suggesting that other characteristics of substituent cations are relevant to the behavior of the resulting materials. Finally, thermal degradation tests reveal that, contrary to general expectations, not all mixed compositions are more stable than their related pure HPs. More than that, the order of degradation kinetics may also depend on the type of substituent cation. The results elucidate the particularities of each type of organic cation on the properties of mixed perovskites and advance knowledge about these relevant materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Differing Effects of Mixed A-Site Composition on the Properties of Hybrid Lead Iodide Perovskites

2023

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“…55,76 These values remain almost unchanged with the aging time, as no clear, prominent change tendency is observed. In the literature, a direct, albeit slight, relation between the band gap energy and cell volume expansion is reported for mixed-cation HPs, 35,55 possibly due to a reduced orbital overlap. Considering this, we initially expected that MAPbI 3 would decrease the band gap energy as a cell volume contraction occurred, which was not veried.…”

Section: Papermentioning

confidence: 99%

“…). 28–35 It is a good approach to study the extrinsic stability of HP materials. However, the way HPs intrinsically change over time is still somewhat missing in current literature.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, several studies have characterized HP thin lms and single/polycrystal behavior under the action of a given stressor (moisture, temperature, etc.). [28][29][30][31][32][33][34][35] It is a good approach to study the extrinsic stability of HP materials. However, the way HPs intrinsically change over time is still somewhat missing in current literature.…”

Section: Introductionmentioning

confidence: 99%

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Intrinsic aging in mixed-cation lead halide perovskites

Minussi

Bertoleti

Eiras

et al. 2022

Sustainable Energy Fuels

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Halide Perovskites and Their Derivatives for Efficient, High‐Resolution Direct Radiation Detection: Design Strategies and Applications

Dudipala,

Le,

Nie

et al. 2023

Advanced Materials

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The past decade has witnessed the rapid rise in performance of optoelectronic devices based on lead‐halide perovskites (LHPs). The large mobility‐lifetime products and defect tolerance of these materials, essential for optoelectronics, also make them well‐suited for radiation detectors, especially given the heavy elements present, which is essential for strong X‐ray and γ‐ray attenuation. Over the past decade, LHP thick films, wafers and single crystals have given rise to direct radiation detectors that have outperformed incumbent technologies in terms of sensitivity (reported values up to 3.5×106 μC Gyair−1 cm−2), limit of detection (directly measured values down to 1.5 nGyair s−1), along with competitive energy and imaging resolution at room temperature. At the same time, lead‐free perovskite‐inspired materials (e.g., methylammonium bismuth iodide), which have underperformed in solar cells, have recently matched and, in some areas (e.g., in polarization stability), surpassed the performance of LHP detectors. These advances open up opportunities to achieve devices for safer medical imaging, as well as more effective non‐invasive analysis for security, nuclear safety or product inspection. Herein, we discuss the principles behind the rapid rises in performance of LHP and perovskite‐inspired material detectors, and how their properties and performance link with critical applications in non‐invasive diagnostics. We discuss the key strategies to engineer the performance of these materials, and the important challenges to overcome to commercialize these new technologies.This article is protected by copyright. All rights reserved

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Structure, optoelectronic properties and thermal stability of the triple organic cation GA_xFA_xMA_1−2xPbI₃ system prepared by mechanochemical synthesis

Abstract: Halide perovskites are a well-known class of materials with many interesting applications. Great attention has been devoted to investigating halide perovskites containing triples methylammonium (MA+), formamidinium (FA+), and guanidinium (GA+)...

Cited by 12 publications

References 80 publications

Differing Effects of Mixed A-Site Composition on the Properties of Hybrid Lead Iodide Perovskites

Differing Effects of Mixed A-Site Composition on the Properties of Hybrid Lead Iodide Perovskites

Intrinsic aging in mixed-cation lead halide perovskites

Halide Perovskites and Their Derivatives for Efficient, High‐Resolution Direct Radiation Detection: Design Strategies and Applications

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