Self‐Healing Behavior of the Metal Halide Perovskites and Photovoltaics

Wang, Chenyun; Qu, Du; Zhou, Bin; Shang, Chuanzhen; Zhang, Xinyue; Tu, Yongguang; Huang, Wei

doi:10.1002/smll.202307645

Cited by 27 publications

(7 citation statements)

References 172 publications

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“…If ion migration is suppressed, phase segregation becomes difficult [93] . Recently, it has been observed that lattice distortion plays a crucial role in this process [94,95] . Lattice distortion, which can be modulated by incorporating differently sized ions, such as small A-site cations or large X-site anions, effectively raises the energy barrier for ion migration [33] .…”

Section: Application Of the Database In Perovskite Segregation Studymentioning

confidence: 99%

Data-driven strategy for bandgap database construction of perovskites and the potential segregation study

Wu,

Zhang,

Wang

et al. 2024

J Mater Inf

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Light-induced segregation limits the practical application of mixed halide perovskites in solar cells. Herein, halide segregation is evaluated by a data-driven approach with constructing a bandgap database of 53,361 mixed ABX3 [where A = Cs, formamidinium (FA) or methylammonium (MA); B = Pb or Sn; X = Br, Cl, or I] perovskites. A transfer learning strategy was employed to fine-tune the parameters of a Graph Neural Network model using experimental and density functional theory (DFT)-calculated bandgaps. This approach accelerated the construction of a unique database, distinguishing it from others primarily focused on ABX3 perovskite element substitution. The database is characterized by continuously varying compositions and accurate bandgaps. It was utilized to calculate the free energy of 20,688 mixed iodine-bromine perovskites and generate corresponding phase diagrams for predicting their light-induced segregation behavior. It is found that the bandgap increases with decreasing ionic radii at the A-site and X-site. This composition-dependent bandgap difference drives halide segregation. Moreover, using a higher Cs content at the A-site, rather than MA, reduces this bandgap difference, enhancing photostability. The proposed data-driven strategy can facilitate the targeted design of novel perovskites with mixed compositions and the investigation of halide perovskite segregation.

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Section: Application Of the Database In Perovskite Segregation Studymentioning

confidence: 99%

Data-driven strategy for bandgap database construction of perovskites and the potential segregation study

Wu,

Zhang,

Wang

et al. 2024

J Mater Inf

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“…Perovskite materials possess outstanding optical and electrical properties, including not only an elevated light absorption coefficient but also an extended carrier diffusion length. − Notably, the certified power conversion efficiency (PCE) of organic–inorganic metal halide perovskite-based perovskite solar cells (PSCs) is 26.1%, almost matching the value of silicon-based solar cells (26.81%) . Therefore, PSCs are widely recognized as a highly promising photovoltaic technology for the forthcoming years owing to their exceptional light-absorbing capabilities, cost-efficiency, and straightforward manufacturing processes. , …”

Section: Introductionmentioning

confidence: 99%

Small-Molecule Copper Chloride Modulating the Buried Interfaces of Perovskite Solar Cells

Chen,

Wu,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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In perovskite solar cells (PSCs), tin dioxide (SnO 2 ) is a highly effective electron transport material. On the other hand, the low intrinsic conductivity of SnO 2 , the high trap-state density on the surface and bulk of SnO 2 , and inadequate interface contacts between SnO 2 and perovskite significantly impact device performance. Herein, smallmolecule copper(II) chloride (CuCl 2 ) is introduced into the SnO 2 dispersion, which inhibits the agglomeration of SnO 2 colloids and improves the quality of the electron transport layer. Furthermore, the introduction of CuCl 2 optimizes the energy-level array between the ETL and perovskite layer (PVK) and passivates the anion/cation defects in SnO 2 , perovskite, and their interface, realizing the systematic modulation of the photoelectronic properties of the ETLs and PVKs as well as the PVK/ETL. As a result, the CuCl 2 -opmized PSC exhibits an impressive power conversion efficiency of 23.71%, along with improved stability.

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“…A great number of defects and imperfections will unavoidably appear in the solution preparation process and will be distributed at the surface and grain boundaries of polycrystalline perovskite thin films. Nowadays, inverted PSCs based on carbazole-based self-assembled monolayers including [2-(9 H -carbazol-9-yl)ethyl]phosphonic acid, [2-(3,6-dimethoxy-9 H -carbazol-9-yl)ethyl]phosphonic acid, [4-(3,6-dimethyl-9 H -carbazol-9-yl)butyl]phosphonic acid, and p-type polymers such as poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), and poly( N , N ′-bis-4-butylphenyl- N , N ′-bisphenyl)benzidine have delivered high efficiency, approaching the efficiency of regular counterparts [ 8 – 12 ].…”

Section: Introductionmentioning

confidence: 99%

Strain Engineering and Halogen Compensation of Buried Interface in Polycrystalline Halide Perovskites

Zhou,

Shang,

Wang

et al. 2024

Research

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Inverted perovskite solar cells based on weakly polarized hole-transporting layers suffer from the problem of polarity mismatch with the perovskite precursor solution, resulting in a nonideal wetting surface. In addition to the bottom-up growth of the polycrystalline halide perovskite, this will inevitably worse the effects of residual strain and heterogeneity at the buried interface on the interfacial carrier transport and localized compositional deficiency. Here, we propose a multifunctional hybrid pre-embedding strategy to improve substrate wettability and address unfavorable strain and heterogeneities. By exposing the buried interface, it was found that the residual strain of the perovskite films was markedly reduced because of the presence of organic polyelectrolyte and imidazolium salt, which not only realized the halogen compensation and the coordination of Pb 2+ but also the buried interface morphology and defect recombination that were well regulated. Benefitting from the above advantages, the power conversion efficiency of the targeted inverted devices with a bandgap of 1.62 eV was 21.93% and outstanding intrinsic stability. In addition, this coembedding strategy can be extended to devices with a bandgap of 1.55 eV, and the champion device achieved a power conversion efficiency of 23.74%. In addition, the optimized perovskite solar cells retained 91% of their initial efficiency (960 h) when exposed to an ambient relative humidity of 20%, with a T80 of 680 h under heating aging at 65 °C, exhibiting elevated durability.

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Self‐Healing Behavior of the Metal Halide Perovskites and Photovoltaics

Cited by 27 publications

References 172 publications

Data-driven strategy for bandgap database construction of perovskites and the potential segregation study

Data-driven strategy for bandgap database construction of perovskites and the potential segregation study

Small-Molecule Copper Chloride Modulating the Buried Interfaces of Perovskite Solar Cells

Strain Engineering and Halogen Compensation of Buried Interface in Polycrystalline Halide Perovskites

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