Electronic Tunability and Mobility Anisotropy of Quasi-2D Perovskite Single Crystals with Varied Spacer Cations

Zhang, Yu; Sun, Mingzi; Zhou, Ning; Huang, Bolong; Zhou, Huanping

doi:10.1021/acs.jpclett.0c02274

Cited by 39 publications

(45 citation statements)

References 36 publications

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“…The factors behind these challenges are many. For instance, for layered perovskites, special care has to be taken during the deposition of the active layer to guarantee that the slabs are oriented perpendicularly to the substrate; otherwise, as mentioned before, a poor charge extraction is obtained due to the strong anisotropic charge mobility characteristics of these materials 64,156 . Also, higher m ‐phases (preferably m > 5) are required for efficient light harvesting, which is a parameter difficult to control during the preparation of the films 50,157 .…”

Section: Electronic Structure and Charge Carrier Dynamicsmentioning

confidence: 99%

Layered metal halide perovskite solar cells: A review from structure‐properties perspective towards maximization of their performance and stability

Holanda

Moral

Marchezi

et al. 2021

EcoMat

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Perovskite solar cells (PSCs) technology is now reaching its full potential in terms of power conversion efficiency, but still presenting problems related to long‐term stability under operating conditions. One of the most promising alternatives to PSCs is the layered PSCs (2D‐PSCs). Layered perovskites present a huge compositional variety, which can be used to directly tune photophysical characteristics that influence the operational mechanisms of the devices. This review addresses the structural organization of both the organic and inorganic sublattices, focusing on how the structure influences the quantum and dielectric confinement, phonons and charge carriers' dynamics, charge mobility, and structural defects. We discuss the relation between the structure‐properties of layered perovskites with the performance of solar cells. We, then, offer insights into how these characteristics have been controlled in the assembly of 2D‐PSCs to improve their efficiency and stability. We conclude by giving a perspective of future developments and open areas of exploration that might impact the progress of this rapidly growing technology.

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Section: Electronic Structure and Charge Carrier Dynamicsmentioning

confidence: 99%

Layered metal halide perovskite solar cells: A review from structure‐properties perspective towards maximization of their performance and stability

Holanda

Moral

Marchezi

et al. 2021

EcoMat

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“…A good example from Zhang et al compared the in-plane mobility against the out-of-plane mobility, as shown in Figure 12b,c. [187] Their results clearly show that irrespective of the cation employed, a 3 order of magnitude difference exists between these crystallographic directions, from ≈10 -2 for in-plane to ≈10 -5 cm 2 V -1 s -1 for outof-plane mobility. Ma et al investigated the effect of changing the interlayer distance between lead-iodide layers.…”

Section: Space-charge Limited Current Measurementsmentioning

confidence: 94%

Section: Basic Optoelectronics Propertiesmentioning

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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“…Zhang et al provided insights into the properties especially the carrier mobility and anisotropy of 2D SCs utilizing three different spacer cations, namely, butylammonium (BA), allylammonium (ALA) and phenethylammonium (PEA) [101]. The TRPL measurements revealed that the carrier lifetime τ 2 of PEA 2 MA 2 Pb 3 I 10 was 19.80 ns, which can be correlated to the decreased exciton binding energy because of the π electrons which can pin the excitonic states to the band edges (Fig.…”

Section: Carrier Lifetime and Carrier Mobilitymentioning

confidence: 99%

Two-dimensional halide perovskite single crystals: principles and promises

et al. 2021

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In the last few years, two-dimensional (2D) metal halide perovskites (MHPs) are gaining tremendous attention and are replacing their three-dimensional (3D) congeners rapidly. These next-generation halide perovskites can circumvent the limitations of the 3D MHPs such as stability and structural diversity. The incorporation of bulky organic cation can not only prevent the moisture penetration into the crystal lattice and thus providing greater stability but also expands the field of hybrid semiconducting materials by offering structural diversity. These unique features render even higher tuneability and improved photophysical properties and as a result intensive investigations have been made for 2D MHP-based polycrystalline thin films. However, single crystals based on two-dimensional halide perovskites are still emerging and have great potential for future device applications. Along with the hybrid halide perovskites, the all inorganic halide perovskites are also blossoming. In this review, we have discussed exclusively the development of hybrid as well as all inorganic two-dimensional halide perovskites. First, we have discussed the crystal structure of 2D perovskites. In the next section, different growth procedures reported for preparation of single crystals are discussed. We then highlight the effect of doping on single crystals and their optoelectronic properties. Finally, we discuss the current challenges and future perspectives to further develop 2D single crystals for their efficient use in various devices.

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Electronic Tunability and Mobility Anisotropy of Quasi-2D Perovskite Single Crystals with Varied Spacer Cations

Cited by 39 publications

References 36 publications

Layered metal halide perovskite solar cells: A review from structure‐properties perspective towards maximization of their performance and stability

Layered metal halide perovskite solar cells: A review from structure‐properties perspective towards maximization of their performance and stability

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

Two-dimensional halide perovskite single crystals: principles and promises

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