Unraveling the influence of CsCl/MACl on the formation of nanotwins, stacking faults and cubic supercell structure in FA-based perovskite solar cells

Pham, H.T.M.; Yin, Yanting; Andersson, Gunther G.; Weber, Klaus; Wong‐Leung, Jennifer

doi:10.1016/j.nanoen.2021.106226

Cited by 37 publications

(37 citation statements)

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“… 21 Furthermore, the addition of a small excess of chloride salt to the starting solution has been shown to enhance crystallization of the perovskite thin films leading to improved optoelectronic properties. 13 , 22 , 23 However, it is not clear if this Cl addition is simply a component that aids the crystallization, or if the residual presence of Cl is playing an active role in the crystallized films. Notably, significant Cl miscibility has been demonstrated in state-of-the-art FA 0.75 Cs 0.25 Pb(I 0.8 Br 0.2 ) 3 compositions, leading to significant improvements in perovskite films for tandem applications.…”

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confidence: 99%

Solvent-Free Method for Defect Reduction and Improved Performance of p-i-n Vapor-Deposited Perovskite Solar Cells

et al. 2022

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As perovskite-based photovoltaics near commercialization, it is imperative to develop industrial-scale defect-passivation techniques. Vapor deposition is a solvent-free fabrication technique that is widely implemented in industry and can be used to fabricate metal-halide perovskite thin films. We demonstrate markably improved growth and optoelectronic properties for vapor-deposited [CH(NH 2 ) 2 ] 0.83 Cs 0.17 PbI 3 perovskite solar cells by partially substituting PbI 2 for PbCl 2 as the inorganic precursor. We find the partial substitution of PbI 2 for PbCl 2 enhances photoluminescence lifetimes from 5.6 ns to over 100 ns, photoluminescence quantum yields by more than an order of magnitude, and charge-carrier mobility from 46 cm 2 /(V s) to 56 cm 2 /(V s). This results in improved solar-cell power conversion efficiency, from 16.4% to 19.3% for the devices employing perovskite films deposited with 20% substitution of PbI 2 for PbCl 2 . Our method presents a scalable, dry, and solvent-free route to reducing nonradiative recombination centers and hence improving the performance of vapor-deposited metal-halide perovskite solar cells.

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confidence: 99%

Solvent-Free Method for Defect Reduction and Improved Performance of p-i-n Vapor-Deposited Perovskite Solar Cells

et al. 2022

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“…Unencapsulated cells MPP at 65 °C in N 2 for 400 h, drop by ≈12% 2020 [30] Cs 0.1 FA 0.9 PbI 3 20.23 Strain engineering _ _ Unencapsulated cells stored at 70% RH for 500 h, drop by <30% _ 2020 [31] Cs 0.17 FA 0.83 PbI 3 23.35 Crystal growth Unencapsulated cells aged at 85 °C and 15 ± 5% RH in the air for 500 h, drop by ≈20% _ _ _ 2021 [32] Cs x FA 1-x PbI 3 21.98 Crystal growth _ _ _ _ 2021 [33] Cs 2019 [42] FA 0.57 MA 0.43 PbI 2.87 Br 0.13 21.21 (Certified) Crystal growth _ _ _ _ 2019 [43] (FAPbI 3 ) x (MAPbBr 2019 [44] (FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 20.7 (Certified) Strain engineering _ _ _ _ 2019 [45] (FAPbI 3 ) 0.95 (MAPbBr 2019 [46] (FAPbI 3 ) 0.97 (MAPbBr 2021 [47] (FAPbI 3 ) 0.97 (MAPbBr 2021 [48] (FAPbI 3 ) 0.94 (MAPbBr 2021 [49] (FAPbI 3 ) 0.95 (MAPbBr 2021 [50] (FAPbI 3 ) 0.9 (MAPbBr 3 ) 0.1 25.2 (Certified) Interface engineering _ _ Encapsulated cells stored at 30% RH for 3600 h, no drop _ 2021 [51] Cs 0.05 FA 0.81 MA 0. 2019 [52] 2019 [53] (Cs,FA,MA)Pb(I,Br) 3 20.87 (Certified) Additive Stored in N 2 for 1500 h, drop by ≈10% _ 2019 [54] Cs 0.07 FA 0.9 MA 0.03 Pb(I 0.92 Br 0.08 ) 2019 [55] Cs 0.05 (FA 0.92 MA 0.08 ) 0.95 Pb(I 0.92 Br 0.08 ) 3 22.3 (Certified) Crystal growth _ _ _ MPP with 420-nm UV filter in N 2 for 1000 h, no drop 2020 [56] Cs _ 2020 [57] (Cs,FA,MA)Pb(I,Br) 3 23.3 (Certified) Crystal growth _ _ _ _ 2020 [58] (Cs,FA,MA)Pb(I,Br) _ 2021 [62] Cs 2021 [63] Cs _ 2021 [66] Table 1.…”

Section: Unencapsulated Cells Aged At 85 °C In Darkmentioning

confidence: 99%

“…For this reason, Park et al [27] adopted a dual additive (MACl/CsCl) approach to simultaneously enhance the photovoltaic performance and stability of FA-rich PSCs. Pham et al [33] systematically studied the roles of the CsCl/MACl additives on the microstructure, crystal structure of nano twin, and stacking fault defects of FAPbI 3 perovskite. The electron diffraction analyses of pure FAPbI 3 demonstrated that the cubic α-phase is unstable and transformed into additional phases including the hexagonal δ-phase, a cubic supercell structure, and a rhombohedral phase.…”

Section: X-sites Halide Anion Tuningmentioning

confidence: 99%

Efficient and Stable FA‐Rich Perovskite Photovoltaics: From Material Properties to Device Optimization

Liu

et al. 2022

Advanced Energy Materials

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The perovskite photovoltaic field has developed rapidly within a decade. In particular, formamidinium (FA)‐rich perovskite allows a broad absorption spectrum, and is considered to be one of the most promising perovskite materials. Great progress has been achieved, and most recorded high‐efficient perovskite solar cells (PSCs) used the FA‐rich perovskite light absorption layer. However, the black α‐phase formamidinium lead iodide (FAPbI3) perovskite easily transforms into an undesirable δ‐phase at a low temperature. Thus, researchers have put a lot of effort into deeply understanding the phase transformation and stabilization mechanism of FA‐rich perovskite. Herein, the fundamental physical properties of FAPbI3 materials, including crystal structure, phase‐transition temperature, charge‐carrier dynamics, etc. are summarized, and establish a complete phase evolution with temperature by reviewing previous reports. The intrinsic and external factors are subsequently discussed for influencing the stability of FAPbI3 perovskite and the remarkable breakthroughs of FA‐rich PSCs in recent years are reviewed. Moreover, a series of strategies to stabilize FA‐rich perovskite is summarized, including but not limited to compositional engineering, passivating engineering, processing engineering, and strain engineering. Finally, several new viewpoints are provided for improving the efficiency and stability of PSCs. This review may be regarded as a reference project for preparing high‐efficient and stable perovskite photovoltaic devices.

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“…To resolve these issues, additives can incorporated in precursors before spin-coating. Lewis acids (e.g., iodopentafluorobenzene) or bases (e.g., methylammonium chloride (MACl)) are commonly used to passivate under-coordinated halide or Pb atoms at grain boundaries or surfaces, while other additives like Pb(SCN) 2 are shown to improve the crystallinity and grain size of 3D LHPs [5,73,74]. Another approach is to drip antisolvent on substrates at the second stage of spin-coating to facilitate homogeneous nucleation by extracting the host solvent (Figure 3a).…”

Section: D Lead Halide Perovskitesmentioning

confidence: 99%

2D Material and Perovskite Heterostructure for Optoelectronic Applications

Miao

Liu

et al. 2022

Nanomaterials

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Optoelectronic devices are key building blocks for sustainable energy, imaging applications, and optical communications in modern society. Two-dimensional materials and perovskites have been considered promising candidates in this research area due to their fascinating material properties. Despite the significant progress achieved in the past decades, challenges still remain to further improve the performance of devices based on 2D materials or perovskites and to solve stability issues for their reliability. Recently, a novel concept of 2D material/perovskite heterostructure has demonstrated remarkable achievements by taking advantage of both materials. The diverse fabrication techniques and large families of 2D materials and perovskites open up great opportunities for structure modification, interface engineering, and composition tuning in state-of-the-art optoelectronics. In this review, we present comprehensive information on the synthesis methods, material properties of 2D materials and perovskites, and the research progress of optoelectronic devices, particularly solar cells and photodetectors which are based on 2D materials, perovskites, and 2D material/perovskite heterostructures with future perspectives.

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Unraveling the influence of CsCl/MACl on the formation of nanotwins, stacking faults and cubic supercell structure in FA-based perovskite solar cells

Cited by 37 publications

References 50 publications

Solvent-Free Method for Defect Reduction and Improved Performance of p-i-n Vapor-Deposited Perovskite Solar Cells

Solvent-Free Method for Defect Reduction and Improved Performance of p-i-n Vapor-Deposited Perovskite Solar Cells

Efficient and Stable FA‐Rich Perovskite Photovoltaics: From Material Properties to Device Optimization

2D Material and Perovskite Heterostructure for Optoelectronic Applications

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