Structurally Tunable Two-Dimensional Layered Perovskites: From Confinement and Enhanced Charge Transport to Prolonged Hot Carrier Cooling Dynamics

El-Ballouli, Ala’a O.; Bakr, Osman M.; Mohammed, Omar F.

doi:10.1021/acs.jpclett.0c00359

Cited by 68 publications

(63 citation statements)

References 141 publications

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“…Therefore, efficient charge carrier generation and their mobility still remain important issues limiting performance efficiency of solar cells utilizing 2D perovskites. [ 13 ]…”

Section: Introductionmentioning

confidence: 99%

Double Charge Transfer Dominates in Carrier Localization in Low Bandgap Sites of Heterogeneous Lead Halide Perovskites

Fakharuddin

Franckevičius

Devižis

et al. 2021

Adv Funct Materials

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Heterogeneous organic‐inorganic halide perovskites possess inherent non‐uniformities in bandgap that are sometimes engineered and exploited on purpose, like in quasi‐2D perovskites. In these systems, charge carrier and excitation energy migration to lower‐bandgap sites are key processes governing luminescence. The question, which of them dominates in particular materials and under specific experimental conditions, still remains unanswered, especially when charge carriers comprise excitons. In this study transient absorption (TA) and transient photoluminescence (PL) techniques are combined to address the excited state dynamics in quasi‐2D and other heterogeneous perovskite structures in broad temperature range, from room temperature down to 15 K. The data provide clear evidence that charge carrier transfer rather than energy migration dominates in heterogeneous quasi‐2D perovskite films.

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“…Therefore, efficient charge carrier generation and their mobility still remain important issues limiting performance efficiency of solar cells utilizing 2D perovskites. [ 13 ]…”

Section: Introductionmentioning

confidence: 99%

Double Charge Transfer Dominates in Carrier Localization in Low Bandgap Sites of Heterogeneous Lead Halide Perovskites

Fakharuddin

Franckevičius

Devižis

et al. 2021

Adv Funct Materials

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“…1(b)). 25,26 Therefore, the X-ray diffraction (XRD) pattern of the highly orientedlayered 2D perovskite structure consists of repetitive diffraction patterns at (00n) peaks (Fig. 1(c)).…”

Section: Chemical and Crystal Structures Of 2d Perovskitesmentioning

confidence: 99%

Emerging doping strategies in two-dimensional hybrid perovskite semiconductors for cutting edge optoelectronics applications

Parveen

Giri

2022

Nanoscale Adv.

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“…[78,218] In order to maximize the potential of LPK-based devices, it is therefore critical to understand the physical and chemical reasons underlying poor charge transport. Here, if we consider the charge transport between inorganic layers as a tunneling process mediated by the organic interlayer shown in Figure 15a, [237,238] then the two properties of the junction controlling the tunneling probability are the barrier width and height. [239][240][241] Whilst the former can be adjusted through the size of the spacer cation, the barrier energy height depends both on the energetic alignment between the inorganic and organic layers, [19,239,242] and the degree of intermolecular electronic coupling between the neighboring organic cations.…”

Section: Functional Spacer Cations For Enhanced Charge Transportmentioning

confidence: 99%

Layered Perovskites in Solar Cells: Structure, Optoelectronic Properties, and Device Design

Sirbu

Balogun

Milot

et al. 2021

Advanced Energy Materials

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optoelectronic properties akin to industrial juggernauts gallium arsenide and silicon. [1,2] Yet, the materials are compatible with solution-processing techniques such as inkjet printing and spray coating. [3] This unprecedented combination has led to the development of solar cells which already show power conversion efficiencies of over 25%, similar to state-of-the-art poly-Si and other thin-film technologies, in just over 10 years of development. [4] Hybrid perovskites are particularly interesting for indoor applications, with impressive efficiencies of over 35% demonstrated under indoor illumination which may prove a viable option to power the ever expanding Internet of Things. [5] Rather than competing with the current technology giants, perovskites can work together with other solar cell technologies in a tandem configuration. Record efficiencies of over 29% for silicon-perovskite tandem solar cells have already been reported and further progress is expected in the near future. [6] Although perovskite solar cells (PSCs) are on the verge of mass production, two main challenges remain: stability [7] and toxicity. [8] Multiple reviews already address the toxicity concern, and it will not be discussed here. [9][10][11] Layered hybrid perovskites (LPKs) have emerged as an answer to battle stability concerns. Although known for decades, LPKs have only recently been incorporated in photovoltaic (PV) applications, resulting in modest device power conversion efficiencies due to poorer optoelectronic properties. [12][13][14] However, their key advantage is the stabilizing effects of the organic interlayers, which prevents perovskite degradation. [15,16] The organic spacer inhibits ion migration which prevents the formation of irreversible degradation products. [17] Alternatively, LPKs can be deposited over the state-of-the-art perovskite materials to combine the high performance of 3D perovskites with the stabilizing properties of LPKs. [15] Here, the limiting factor is inefficient charge transport across the organic interlayer, currently preventing the full exploitation of the layered structure in PSCs.This can be approached in two ways, either by keeping the LPK layer very thin, currently the most popular approach, or by increasing the electrical conductivity of the material. [18,19] The conductivity can be enhanced through increasing the number of inorganic layers n, but this comes at the price of reduced stability. [20][21][22] The better approach is to enhance the charge transport in LPKs through the molecular engineering of the organic Layered hybrid perovskites (LPKs) have emerged as a viable solution to address perovskite stability concerns and enable their implementation in wide-scale energy harvesting. Yet, although more stable, the performance of devices incorporating LPKs still lags behind that of state-of-the-art, multication perovskite materials. This is typically assigned to their poor charge transport, currently caused by the choice of cations used within the organic layer. On balance, a compromise bet...

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Structurally Tunable Two-Dimensional Layered Perovskites: From Confinement and Enhanced Charge Transport to Prolonged Hot Carrier Cooling Dynamics

Cited by 68 publications

References 141 publications

Double Charge Transfer Dominates in Carrier Localization in Low Bandgap Sites of Heterogeneous Lead Halide Perovskites

Double Charge Transfer Dominates in Carrier Localization in Low Bandgap Sites of Heterogeneous Lead Halide Perovskites

Emerging doping strategies in two-dimensional hybrid perovskite semiconductors for cutting edge optoelectronics applications

Layered Perovskites in Solar Cells: Structure, Optoelectronic Properties, and Device Design

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