A Bifunctional Lewis Base Additive for Microscopic Homogeneity in Perovskite Solar Cells

Chem, Год журнала: 2017, Номер 3(2), С. 290 - 302

Опубликована: Авг. 1, 2017

Язык: Английский

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Passivated Single-Crystalline CH₃NH₃PbI₃ Nanowire Photodetector with High Detectivity and Polarization Sensitivity

Nano Letters, Год журнала: 2016, Номер 16(12), С. 7446 - 7454

Опубликована: Ноя. 1, 2016

Photodetectors convert light signals into current or voltage outputs and are widely used for imaging, sensing, spectroscopy. Perovskite-based photodetectors have shown high sensitivity fast response due to the unprecedented low recombination loss in this solution processed semiconductor. Among various types of CH3NH3PbI3 morphology (film, single crystal, nanowire), single-crystalline nanowires particularly interesting photodetection because their reduced grain boundary, morphological anisotropy, excellent mechanical flexibility. The concomitant disadvantage associated with nanowire is large surface area, which catalyzes carrier material decomposition, thus significantly degrading device performance stability. Here we solved key problem by introducing oleic acid soaking passivate defects nanowires, leads a much improved stability (measured detectivity 2 × 1013 Jones). By taking advantage one-dimensional geometry, also showcased, first time, linear dichroic our photodetector.

Язык: Английский

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Perovskite solar cells: An integrated hybrid lifecycle assessment and review in comparison with other photovoltaic technologies

Renewable and Sustainable Energy Reviews, Год журнала: 2017, Номер 80, С. 1321 - 1344

Опубликована: Июнь 13, 2017

Solar cells are considered as one of the prominent sources renewable energy suitable for large-scale adoption in a carbon-constrained world and can contribute to reduced reliance on imports, whilst improving security supply. A new arrival family solar technologies is organic-inorganic halide perovskite. The major thrust endorsing these pertains their potential an economically environmentally viable option traditional silicon-based technology. To verify this assertion, paper presents critical review some existing photovoltaic (PV) comparison with perovskite-structured (PSCs), including material performance parameters, production processes manufacturing complexity, economics, key technological challenges further developments current research efforts. At present, there limited environmental assessment PSCs consequently, methodologically robust expansive lifecycle supply chain two types PSC modules B also undertaken within context other PV technologies, assess friendly innovation sector. Module based MAPbX3 perovskite structure while module CsFAPbX3 improved stability, reproducibility high efficiency. main outcomes, presented along sensitivity analysis, show that offer more sustainable option, least payback period, compared technologies. analysis provide valuable insight guidance identifying pathways windows opportunity future designs towards cleaner production.

Язык: Английский

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Multifunctional molecular modulators for perovskite solar cells with over 20% efficiency and high operational stability

Nature Communications, Год журнала: 2018, Номер 9(1)

Опубликована: Окт. 22, 2018

Abstract Perovskite solar cells present one of the most prominent photovoltaic technologies, yet their stability, scalability, and engineering at molecular level remain challenging. We demonstrate a concept multifunctional modulation scalable operationally stable perovskite that exhibit exceptional solar-to-electric power conversion efficiencies. The judiciously designed bifunctional modulator SN links mercapto-tetrazolium (S) phenylammonium (N) moieties, which passivate surface defects, while displaying structure-directing function through interaction with induces formation large grain crystals high electronic quality thermally formamidinium cesium mixed lead iodide formulation. As result, we achieve greatly enhanced cell performance efficiencies exceeding 20% for active device areas above 1 cm 2 without use antisolvents, accompanied by outstanding operational stability under ambient conditions.

Язык: Английский

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Impact of grain boundaries on efficiency and stability of organic-inorganic trihalide perovskites

Nature Communications, Год журнала: 2017, Номер 8(1)

Опубликована: Дек. 14, 2017

Organic-inorganic perovskite solar cells have attracted tremendous attention because of their remarkably high power conversion efficiencies (PCEs). To further improve the device performance, however, it is imperative to obtain fundamental understandings on photo-response and long-term stability down microscopic level. Here, we report first quantitative nanoscale photoconductivity imaging two methylammonium lead triiodide (MAPbI3) thin films with different PCEs by light-stimulated microwave impedance microscopy. The intrinsic largely uniform across grains grain boundaries, which direct evidence inherently benign nature microstructures in films. In contrast, carrier mobility lifetime are strongly affected bulk properties such as sample crystallinity. As visualized spatial evolution local photoconductivity, degradation due water diffusion through capping layer begins disintegration large rather than nucleation propagation from boundaries. Our findings provide new insights electro-optical MAPbI3 towards large-scale commercialization.

Язык: Английский

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Atomic-scale microstructure of metal halide perovskite

Science, Год журнала: 2020, Номер 370(6516)

Опубликована: Окт. 29, 2020

Structural secrets of hybrid perovskites The optoelectronic and photovoltaic applications polycrystalline metal halide perovskite films are notable because grain boundaries in most materials cause scattering charge carriers that decreases performance. Electron microscopy studies these have been hindered by their rapid structural degradation under intense electron beams. Rothmann et al. now present an atomic crystallographic structure formamidinium lead triiodide (FAPbI 3 ) thin obtained low-electron-dose scanning transmission with advanced image processing. crystal sustains substoichiometry the A-site cation, has a nearly perfect alignment between PbI 2 impurity phases FAPbI perovskite, atomically clean domains. These features help to explain films' surprising regenerative ability, benign where strain dislocations appear mostly absent, why excess lead-iodide precursor can be counterintuitively beneficial. Science , this issue p. eabb5940

Язык: Английский

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The role of grain boundaries in perovskite solar cells

Materials Today Energy, Год журнала: 2017, Номер 7, С. 149 - 160

Опубликована: Авг. 10, 2017

Язык: Английский

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Low-frequency lattice phonons in halide perovskites explain high defect tolerance toward electron-hole recombination

Science Advances, Год журнала: 2020, Номер 6(7)

Опубликована: Фев. 14, 2020

Low-cost solution-based synthesis of metal halide perovskites (MHPs) invariably introduces defects in the system, which could form Shockley-Read-Hall (SRH) electron-hole recombination centers detrimental to solar conversion efficiency. Here, we investigate nonradiative processes due native point methylammonium lead (MAPbI3) using ab initio nonadiabatic molecular dynamics within surface-hopping framework. Regardless whether introduce a shallow or deep band state, find that charge MAPbI3 is not enhanced, contrary predictions from SRH theory. We demonstrate this strong tolerance against defects, and hence breakdown SRH, arises because photogenerated carriers are only coupled with low-frequency phonons electron hole states overlap weakly. Both factors appreciably decrease coupling. argue soft nature inorganic lattice small bulk modulus key for defect tolerance, hence, findings general other MHPs.

Язык: Английский

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Molecular behavior of zero-dimensional perovskites

Science Advances, Год журнала: 2017, Номер 3(12)

Опубликована: Дек. 1, 2017

Researchers provide new insights into the formation of small polarons in zero-dimensional perovskites.

Язык: Английский

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Rationalization of passivation strategies toward high-performance perovskite solar cells

Chemical Society Reviews, Год журнала: 2022, Номер 52(1), С. 163 - 195

Опубликована: Дек. 1, 2022

Lead halide perovskite solar cells (PSCs) have shown unprecedented development in efficiency and progressed relentlessly improving stability. All the achievements been accompanied by diverse passivation strategies to circumvent pervasive defects materials, which play crucial roles process of charge recombination, ion migration, component degradation. Among tremendous efforts made solve these issues achieve high-performance PSCs, we classify review both well-established burgeoning provide further guidance for protocols including chemical eliminate formation bonds, physical strain relaxation or treatments, energetic improve stability toward light oxygen, field-effect regulate interfacial carrier behavior. The subtle but non-trivial consequences from various need advanced characterization techniques combining synchrotron-based X-ray analysis, capacitance-based measurements, spatially resolved imaging, fluorescent molecular probe, Kelvin probe force microscope, etc., scrutinize mechanisms. In end, challenges prospective research directions on advancing are proposed. Judicious combinations among chemical, physical, energetic, deserve more attention future high-efficiency stable photovoltaics.

Язык: Английский

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