Photoinduced Reversible Structural Transformations in Free-Standing CH3NH3PbI3 Perovskite Films

Gottesman, Ronen; Gouda, Laxman; Kalanoor, Basanth S.; Haltzi, Eynav; Tirosh, Shay; Rosh-Hodesh, Eli; Tischler, Yaakov R.; Zaban, Arie; Quarti, Claudio; Mosconi, Edoardo; Angelis, Filippo De

doi:10.1021/acs.jpclett.5b00994

Cited by 200 publications

(252 citation statements)

References 57 publications

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“…56 In fact, the role of oxygen is supported by the fact that PL intensity decreases upon white illumination in N 2 environment. 55,55,57 PL intensity enhancement upon illumination in ambient conditions has been reported and tentatively explained by a catalytic reaction induced by oxygen in inorganic SrTiO 3 thin film perovskite. This work highlights how substrate influences not just the interfacial properties of perovskite devices but also bulk perovskite properties, fact with important implications on the PSC working mechanisms.…”

Section: Films On Different Substratesmentioning

confidence: 82%

Influence of the substrate on the bulk properties of hybrid lead halide perovskite films

et al. 2016

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In addition to the known effect of substrate on interfacial properties of perovskite films, here we show that bulk properties of Hybrid Lead Halide Perovskite films depend on the type of substrate used for film growth. Despite the relative large film thickness, ~600 nm, the roughness and nature of the substrate layer (glass, FTO, TiO 2 and PEDOT:PSS) affect not just the degree of preferential orientation and crystal grain size Raman peaks.The irreversible photoluminescence enhancement observed at low power with illumination time, also dependent on the substrate nature, is proposed to be due to the localization of the electron-hole excitons created in the vicinity of the light generated defects. The results shed light into the performance of the perovskite layer and help understanding how bulk processes, where ion migration is a conspicuous example, are severely affected by interfacial properties as those imposed by the substrate.

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Section: Films On Different Substratesmentioning

confidence: 82%

Influence of the substrate on the bulk properties of hybrid lead halide perovskite films

et al. 2016

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“…[69] A slow decrease of the PL amplitude can have different reasons, but usually all are associated with light-induced ion migration.…”

Section: Photoinduced Degradationmentioning

confidence: 99%

Impact of Structural Dynamics on the Optical Properties of Methylammonium Lead Iodide Perovskites

Panzer

Meier

et al. 2017

Advanced Energy Materials

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structure, [2] and changing the ratio of precursor compounds prior to the formation of the perovskite layer. [3] These approaches are based on modifying the crystallization process, for example, by controlling the composition of the precursor solution and by varying processing parameters. Such changes also led to major improvements in perovskite-based light-emitting devices within the last year. Initially, the current efficiencies were improved by optimizing the grain size to values below 100 nm, and by changing the precursor compound molar proportions. [4] More recently, efficient perovskite-based LEDs with external quantum efficiencies exceeding 10% were even obtained by expanding towards lower dimensional perovskite structures. [5] Different structures and dimensionalities resulted in altered charge-carrier dynamics affecting the radiative recombination efficiency. [5,6] By drawing strong correlations between structural properties and their electronic structure, major breakthroughs toward light-emitting devices or in photovoltaics could be achieved in very recent years. To a certain extent, this resembles the evolution in the field of organic semiconductors, where improved understanding of the interplay between morphological and electronic structure proved essential to facilitate the recent progress in organic photovoltaics, and the successful commercialisation of organic LED devices. Also, for hybrid perovskites the question of how crystal structure, shape, and grain size governs the electronic structure will remain an important topic in the future to further improve perovskite-based optoelectronic devices. Since the solution processability of hybrid perovskites enables easy tuning of material compositions, a large number of different hybrid perovskites were reported. For example, exchanging the organic cation can alter the crystal structure, shift phase transitions, as does formamidinium, or change further excited-state dynamics, as is happening with Cs or Ru. Furthermore, different halide anions change the optical and excited state properties. The optical bandgap can be changed from the UV to NIR region by replacing the halide from Cl to Br to I. Mixed-halide systems thereof even provide a way to gradually tune the respective bandgap. In fact, the recently reported, most stable and efficient perovskite solar cells (PSCs) are based on a highly optimized mixture of different anions and cations. [1,7] Nevertheless, the most investigated hybrid perovskite representative is the methylammonium lead iodide perovskite CH 3 NH 3 PbI 3 (MAPbI 3 ), which, in the meantime, has become Organolead halide perovskites have attracted a lot of attention over the recent years mostly due to their bright prospective application in photovoltaic devices. For further development, characterization of their physical properties plays a seminal role in order to gain an in-depth understanding of these mid-bandgap ionic semiconductors. Their unique optical and electronic properties are a result of their characteristic electronic stru...

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“…15 Furthermore, even though the MA is known to rotate rapidly at room temperature 16,17 , ferroelectric effects related to oriented MA domains under applied bias have been suggested. 15,18,19 The dynamic interplay between MA cation and the inorganic Pb-X cage is currently under scrutiny, 20,21 with several attempts to measure Raman active bands of CH 3 NH 3 PbX 3 recently reported [22][23][24][25] . Since the organic-inorganic interplay is governed by hydrogen bonding interactions between the NH 3 + group of the MA cation and the electronegative halide atoms 20,26 , detailed knowledge of the hydrogen bonding is necessary for a full understanding of the exceptional electronic properties of the material.…”

Section: Introductionmentioning

confidence: 99%

Infrared Spectroscopic Study of Vibrational Modes in Methylammonium Lead Halide Perovskites

Glaser

Müller

Sendner

et al. 2015

J. Phys. Chem. Lett.

302

317

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The organic cation and its interplay with the inorganic lattice underlie the exceptional optoelectronic properties of organo-metallic halide perovskites. Herein we report high-quality infrared spectroscopic measurements of methylammonium lead halide perovskite (CH3NH3Pb(I/Br/Cl)3) films and single crystals at room temperature, from which the dielectric function in the investigated spectral range is derived. Comparison with electronic structure calculations in vacuum of the free methylammonium cation allows for a detailed peak assignment. We analyze the shifts of the vibrational peak positions between the different halides and infer the extent of interaction between organic moiety and the surrounding inorganic cage. The positions of the NH3(+) stretching vibrations point to significant hydrogen bonding between the methylammonium and the halides for all three perovskites.

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Photoinduced Reversible Structural Transformations in Free-Standing CH₃NH₃PbI₃ Perovskite Films

Cited by 200 publications

References 57 publications

Influence of the substrate on the bulk properties of hybrid lead halide perovskite films

Influence of the substrate on the bulk properties of hybrid lead halide perovskite films

Impact of Structural Dynamics on the Optical Properties of Methylammonium Lead Iodide Perovskites

Infrared Spectroscopic Study of Vibrational Modes in Methylammonium Lead Halide Perovskites

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