Ionic and Optical Properties of Methylammonium Lead Iodide Perovskite across the Tetragonal–Cubic Structural Phase Transition

Hoque, Nadim Ferdous; Islam, Nazifah; Li, Zhen; Ren, Guofeng; Zhu, Kai; Fan, Zhaoyang

doi:10.1002/cssc.201600949

Cited by 68 publications

(54 citation statements)

References 46 publications

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“…In the present study, the transition from E a = 0.1 eV to E a = 0.41 eV occurs around 250 K, which does not coincide with the T C for the orthorhombic‐to‐tetragonal or tetragonal‐to‐cubic phase transitions, and which therefore excludes the possibility of change in activation energy due to crystal symmetry change. However, the onset of the lower‐activation ion migration process (characterized by the change from ≈27 meV to 0.1 eV) roughly coincides with the first‐order orthorhombic‐to‐tetragonal phase transition around 160 K, which likely points toward a structural mediation of the migration mechanism, such as that proposed by Hoque et al…”

Section: Resultsmentioning

confidence: 53%

“…Hoque et al observed a decrease in activation energy (0.73 to 0.51 eV) of ion migration in MAPbI 3 solar cells around 320 K, which roughly falls in the temperature regime of tetragonal‐to‐cubic phase transition. This decrease was tentatively assigned to the difference in the vacancy‐hopping mechanism arising due to crystal symmetry change, thus leading to different activation barriers.…”

Section: Resultsmentioning

confidence: 99%

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Ions Matter: Description of the Anomalous Electronic Behavior in Methylammonium Lead Halide Perovskite Devices

Game

Buchsbaum

Zhou

et al. 2017

Adv Funct Materials

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Carrier transport in methylammonium lead iodide (MAPbI 3 )-based hybrid organic-inorganic perovskites (HOIPs) is obscured by vacancy-mediated ion migration. Thus, the nature of migrating species (cation/anion) and their effect on electronic transport in MAPbI 3 has remained controversial. Temperature-dependent pulsed voltage-current measurements of MAPbI 3 thin films are performed under dark conditions, designed to decouple ion-migration/ accumulation and electronic transport. Measurement conditions (electric-field history and scan rate) are shown to affect the electronic transport in MAPbI 3 thin films, through a mechanism involving ion migration and accumulation at the electrode interfaces. The presence of thermally activated processes with distinct activation energies (E a ) of 0.1 ± 0.001 and 0.41 ± 0.02 eV is established, and are assigned to electromigration of iodine vacancies and methylammonium vacancies, respectively. Analysis of activation energies obtained from electronic conduction versus capacitive discharge shows that the electromigration of these ionic species is responsible for the modification of interfacial electronic properties of MAPbI 3 , and elaborates previously unaddressed issues of "fast" and "slow" ion migration. The results demonstrate that the intrinsic behavior of MAPbI 3 material is responsible for the hysteresis of the solar cells, but also have implications for other HOIP-based devices, such as memristors, detectors, and energy storage devices.

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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Ions Matter: Description of the Anomalous Electronic Behavior in Methylammonium Lead Halide Perovskite Devices

Game

Buchsbaum

Zhou

et al. 2017

Adv Funct Materials

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show abstract

“…[80] Due to the slow timescale, the low-frequency arc was interpreted as arising from ion migration in the perovskite film under study. [94][95][96][97][98] Detailed discussion of such an ion migration process will be given below. Besides, the IS measurements were also used to study other charge dynamic processes, such as surface polarization, [99] charge collection, [100] hysteresis phenomenon, [101] etc.…”

Section: Charge Dynamicsmentioning

confidence: 99%

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Yang

Meng

Yang

2017

Advanced Energy Materials

374

265

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Organic‐inorganic halide perovskite materials have become a shining star in the photovoltaic field due to their unique properties, such as high absorption coefficient, optimal bandgap, and high defect tolerance, which also lead to the breathtaking increase in power conversion efficiency from 3.8% to over 22% in just seven years. Although the highest efficiency was obtained from the TiO2 mesoporous structure, there are increasing studies focusing on the planar structure device due to its processibility for large‐scale production. In particular, the planar p‐i‐n structure has attracted increasing attention on account of its tremendous advantages in, among other things, eliminating hysteresis alongside a competitive certified efficiency of over 20%. Crucial for the device performance enhancement has been the interface engineering for the past few years, especially for such planar p‐i‐n devices. The interface engineering aims to optimize device properties, such as charge transfer, defect passivation, band alignment, etc. Herein, recent progress on the interface engineering of planar p‐i‐n structure devices is reviewed. This review is mainly focused on the interface design between each layer in p‐i‐n structure devices, as well as grain boundaries, which are the interfaces between polycrystalline perovskite domains. Promising research directions are also suggested for further improvements.

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“…Previous reports have ascribed the first semicircle in the mid frequency region to the impedance arising from electron transport where a smaller circle indicates a lower charge transfer resistance at the perovskite interfaces . The first semicircle closest to the origin can be ascribed to impedance arising from electronic transport . On the other hand, double layer capacitance or charge accumulation mechanisms have been proposed for the formation of the semicircle in the low frequency region.…”

Section: Resultsmentioning

confidence: 95%

Origin of Performance Enhancement in TiO₂‐Carbon Nanotube Composite Perovskite Solar Cells

et al. 2019

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Carbon nanotubes are shown to be beneficial additives to perovskite solar cells, and the inclusion of such nanomaterials will continue to play a crucial role in the push toward developing efficient and stable device architectures. Herein, titanium dioxide/carbon nanotube composite perovskite solar cells are fabricated, and device performance parameters are correlated with spectroscopic signatures of the materials to understand the origin of performance enhancement. By probing the charge carrier dynamics with photoluminescence and femtosecond transient absorption spectroscopy, the results indicate that charge transfer is not improved by the presence of the carbon nanotubes. Instead, carbon nanotubes are shown to passivate the electronic defect states within the titanium dioxide, which can lead to stronger radiative recombination in the titanium dioxide/carbon nanotube films. The defect passivation allows the perovskite solar cells made using an optimized titanium dioxide/carbon nanotube composite to achieve a peak power conversion efficiency of 20.4% (19% stabilized), which is one of the highest values reported for perovskite solar cells not incorporating a mixed cation light absorbing layer. The results discuss new fundamental understandings for the role of carbon nanomaterials in perovskite solar cells and present a significant step forward in advancing the field of high‐performance photovoltaics.

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Ionic and Optical Properties of Methylammonium Lead Iodide Perovskite across the Tetragonal–Cubic Structural Phase Transition

Cited by 68 publications

References 46 publications

Ions Matter: Description of the Anomalous Electronic Behavior in Methylammonium Lead Halide Perovskite Devices

Ions Matter: Description of the Anomalous Electronic Behavior in Methylammonium Lead Halide Perovskite Devices

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Origin of Performance Enhancement in TiO₂‐Carbon Nanotube Composite Perovskite Solar Cells

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Ionic and Optical Properties of Methylammonium Lead Iodide Perovskite across the Tetragonal–Cubic Structural Phase Transition

Cited by 68 publications

References 46 publications

Ions Matter: Description of the Anomalous Electronic Behavior in Methylammonium Lead Halide Perovskite Devices

Ions Matter: Description of the Anomalous Electronic Behavior in Methylammonium Lead Halide Perovskite Devices

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Origin of Performance Enhancement in TiO2‐Carbon Nanotube Composite Perovskite Solar Cells

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Origin of Performance Enhancement in TiO₂‐Carbon Nanotube Composite Perovskite Solar Cells