Molecular Engineering for Two-Dimensional Perovskites with Photovoltaic Efficiency Exceeding 18%

Wu, Guo Qing; Yang, Tinghuan; Li, Xing; Ahmad, Nafees; Zhang, Xuning; Yue, Shengli; Zhou, Jin; Li, Yanxun; Wang, Hui; Shi, Xinghua; Liu, Shengzhong; Zhao, Kui; Zhou, Huiqiong; Zhang, Yuan

doi:10.1016/j.matt.2020.11.011

Cited by 143 publications

(132 citation statements)

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“…The suppressed ion migration results in operational stability of 1 year. A novel 2D RP perovskite (AA) 2 MA 3 Pb 4 I 13 yields 18.42% efficiency (Wu et al, 2020a). Phenylethylammonium is used to facilitate formation as well as control of 2D perovskite, which is also able to suppress charge recombination in CsPbI 3 .…”

Section: Composition Engineeringmentioning

confidence: 99%

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Stability of Perovskite Solar Cells: Degradation Mechanisms and Remedies

2021

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Inorganic–organic metal halide perovskite light harvester-based perovskite solar cells (PSCs) have come to the limelight of solar cell research due to their rapid growth in efficiency. At present, stability and reliability are challenging aspects concerning the Si-based or thin film-based commercial devices. Commercialization of perovskite solar cells remains elusive due to the lack of stability of these devices under real operational conditions, especially for longer duration use. A large number of researchers have been engaged in an ardent effort to improve the stability of perovskite solar cells. Understanding the degradation mechanisms has been the primary importance before exploring the remedies for degradation. In this review, a methodical understanding of various degradation mechanisms of perovskites and perovskite solar cells is presented followed by a discussion on different steps taken to overcome the stability issues. Recent insights on degradation mechanisms are discussed. Various approaches of stability enhancement are reviewed with an emphasis on reports that complied with the operational standard for practical application in a commercial solar module. The operational stability standard enacted by the International Electrotechnical Commission is especially discussed with reports that met the requirements or showed excellent results, which is the most important criterion to evaluate a device’s actual prospect to be utilized for practical applications in commercial solar modules. An overall understanding of degradation pathways in perovskites and perovskite solar cells and steps taken to overcome those with references including state-of-the-art devices with promising operational stability can be gained from this review.

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Section: Composition Engineeringmentioning

confidence: 99%

“…Positively charged metal cations are proven to be effective in passivation. Two groups have demonstrated that a little excess of PbI 2 can effectively passivate the perovskite film (Shi et al, 2018;Yang et al, 2020a). That leads to longer carrier lifetime and reduced halide vacancies for high-efficiency perovskite solar cells.…”

Section: Lewis Acidsmentioning

confidence: 99%

Stability of Perovskite Solar Cells: Degradation Mechanisms and Remedies

2021

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“…For example, Zhang et al reported 2D perovskite photovoltaic devices of (AA) 2 (MA) 3 Pb 4 I 13 (AA = amylamine, MA = methylammonium) with a high power conversion efficiency (18.42%). 42 Huang et al demonstrated that solution-processed 2D perovskite light-emitting diodes have excellent film morphologies and exhibit high external quantum efficiency (11.7%). 43 Nonetheless, many challenges that need to be overcome prior to 2D perovskite materials having potential applications in practical optoelectronic devices still remain.…”

Section: Introductionmentioning

confidence: 99%

Spin–Orbit Coupling Is the Key to Promote Asynchronous Photoinduced Charge Transfer of Two-Dimensional Perovskites

Yang

Chen

Liu

et al. 2021

JACS Au

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Two-dimensional (2D) perovskites are emerging as promising candidates for diverse optoelectronic applications because of low cost and excellent stability. In this work, we explore the electronic structures and interfacial properties of (4Tm) 2 PbI 4 with both the collinear and noncollinear DFT (PBE and HSE06) methods. The results evidently manifest that explicitly considering the spin–orbit coupling (SOC) effects is necessary to attain correct band alignment of (4Tm) 2 PbI 4 that agrees with recent experiments ( 31712613 Nat. Chem. 2019 11 1151 ; 32350477 Nature 2020 580 614 ). The subsequent time-domain noncollinear DFT-based nonadiabatic carrier dynamics simulations with the SOC effects reveal that the photoinduced electron and hole transfer processes are asymmetric and associated with different rates. The differences are mainly ascribed to considerably different nonadiabatic couplings in charge of the electron and hole transfer processes. Shortly, our current work sheds important light on the mechanism of the interfacial charge carrier transfer processes of (4Tm) 2 PbI 4 . The importance of the SOC effects on correctly aligning the band states of (4Tm) 2 PbI 4 may be generalized to similar organic–inorganic hybrid 2D perovskites having heavy Pb atoms.

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“…To date, various kinds of spacer cations for RP phase perovskite, such as BA, PEA, and amyl ammonium (AA), have been explored. [64][65][66][67][68][69][70] For the DJ phase structure with the formula of A′A n−1 B n X 3n+1 , diammonium spacer molecule (A′) possessed two ammonium cations in the terminal, which link two layers of inorganic slab together without a gap through terminal ionic bonding and covalent bond, forming a more stable crystal structure compared to RP phase. [71][72] Generally, in the DJ phase structure, the octahedrons above and below the spacer cation layer show nondisplacement (0, 0), thus perfectly stacked with each other.…”

Section: 〈100〉-orientedmentioning

confidence: 99%

2D Hybrid Halide Perovskites: Structure, Properties, and Applications in Solar Cells

Liang

Zhang

et al. 2021

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Abstract2D metal‐halide perovskites have attracted intense research interest due to superior long‐term stability under ambient environments. Compared to their 3D analog, the alternate arrangement of organic and inorganic layers leads to forming a multilayer quantum well (MQW), which endows 2D perovskites with anisotropic optoelectronic properties. In addition, the spacer layer functions as a hydrophobic barrier to effectively prevent 2D perovskite films from ion migration and moisture penetrating, thus realizing outstanding stability. Recently, 2D perovskites have been widely developed with abundant species. The stunning photovoltaic performance with the coexistence of long‐term stability and high‐power conversion efficiency (PCE) has been realized in 2D perovskite solar cells (PSCs), which paves an avenue for commercialization of PSCs. This review begins with an introduction of crystal structure and crystallization kinetics to illustrate the unique layer characters in 2D perovskites. Then, electron structure, excitons, dielectric confinement, and intrinsic stability properties are discussed in detail. Next, the photovoltaic performance based on recent Ruddlesden–Popper (RP), Dion–Jacobson (DJ), and alternating cations in the interlayer (ACI) phase 2D‐PSCs is comprehensively summarized. Finally, the confronting challenges and strategies toward structural design and optoelectronic studies of 2D perovskites are proposed to offer insight into the advanced underlying properties of this family of materials.

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Molecular Engineering for Two-Dimensional Perovskites with Photovoltaic Efficiency Exceeding 18%

Cited by 143 publications

References 50 publications

Stability of Perovskite Solar Cells: Degradation Mechanisms and Remedies

Stability of Perovskite Solar Cells: Degradation Mechanisms and Remedies

Spin–Orbit Coupling Is the Key to Promote Asynchronous Photoinduced Charge Transfer of Two-Dimensional Perovskites

2D Hybrid Halide Perovskites: Structure, Properties, and Applications in Solar Cells

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