Establishing charge-transfer excitons in 2D perovskite heterostructures

Zhang, Jia; Zhu, Xixiang; Wang, Miaosheng; Hu, Bin

doi:10.1038/s41467-020-16415-1

Cited by 74 publications

(82 citation statements)

References 59 publications

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“…More than these effects, trap‐induced exciton dissociation may further increase the carrier lifetime to microseconds or even longer. [ 81,82 ] The carrier lifetimes at electron−hole separated state are found to be as long as 1597 ns. [ 81 ] Luo et al.…”

Section: Fundamental Properties Of Carrier Exciton and Excitonic Qumentioning

confidence: 99%

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Photophysics of 2D Organic–Inorganic Hybrid Lead Halide Perovskites: Progress, Debates, and Challenges

et al. 2021

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2D organic–inorganic hybrid Ruddlesden–Popper perovskites (RPPs) have recently attracted increasing attention due to their excellent environmental stability, high degree of electronic tunability, and natural multiquantum‐well structures. Although there is a rapid development of photoelectronic applications in solar cells, photodetectors, light emitting diodes (LEDs), and lasers based on 2D RPPs, the state‐of‐the‐art performance is far inferior to that of the existing devices because of the limited understanding on fundamental physics, especially special photophysics in carrier dynamics, excitonic fine structures, excitonic quasiparticles, and spin‐related effect. Thus, there is still plenty of room to improve the performances of photoelectronic devices based on 2D RPPs by enhancing knowledge on fundamental photophysics. This review highlights the special photophysics of 2D RPPs that is fundamentally different from the conventional 3D congeners. It also provides the most recent progress, debates, challenges, prospects, and in‐depth understanding of photophysics in 2D perovskites, which is significant for not only boosting performance of solar cells, LEDs, photodetectors, but also future development of applications in lasers, spintronics, quantum information, and integrated photonic chips.

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Section: Fundamental Properties Of Carrier Exciton and Excitonic Qumentioning

confidence: 99%

“…[ 81,82 ] The carrier lifetimes at electron−hole separated state are found to be as long as 1597 ns. [ 81 ] Luo et al. synthesized Mn 2+ homogeneously doped 2D RPPs EA 2 PbBr 4 (EA = ethylammonium) via a reprecipitation method.…”

Section: Fundamental Properties Of Carrier Exciton and Excitonic Qumentioning

confidence: 99%

Photophysics of 2D Organic–Inorganic Hybrid Lead Halide Perovskites: Progress, Debates, and Challenges

et al. 2021

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“…1 c, using a combination of PEA 2 PbI 4 : PEA 2 SnI 4 which operates as a host and guest, respectively. This process leads to tuning of the properties of the perovskite that can provide opportunities to develop advanced optoelectronic devices [ 37 ].…”

Section: D Nanomaterials For Energy Scavenging Devicesmentioning

confidence: 99%

2D Nanomaterials for Effective Energy Scavenging

et al. 2021

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The development of a nation is deeply related to its energy consumption. 2D nanomaterials have become a spotlight for energy harvesting applications from the small-scale of low-power electronics to a large-scale for industry-level applications, such as self-powered sensor devices, environmental monitoring, and large-scale power generation. Scientists from around the world are working to utilize their engrossing properties to overcome the challenges in material selection and fabrication technologies for compact energy scavenging devices to replace batteries and traditional power sources. In this review, the variety of techniques for scavenging energies from sustainable sources such as solar, air, waste heat, and surrounding mechanical forces are discussed that exploit the fascinating properties of 2D nanomaterials. In addition, practical applications of these fabricated power generating devices and their performance as an alternative to conventional power supplies are discussed with the future pertinence to solve the energy problems in various fields and applications.

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“…[16][17][18][19][20] Most of the investigations, however, have been performed on lead-based systems, leaving the effect of the metal cation on the excitonic characteristics as an open question. This problem garners relevance due to the growing interest in tin-based [21][22][23][24][25][26][27][28][29][30][31] and tin-alloyed 32,33 MHPs driven by environmental and stability concerns caused by the use of lead. 34 Substitution of lead with Sn 2+ 35 or Ge 2+ 33,36 will also enable us to address some of the contested claims on the peculiar characteristics of excitons in 2D-MHPs that distinguish them from their counterparts in other 2D materials.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Tin Substitution on the Excitonic Properties of Two Dimensional Metal Halide Perovskites

Folpini¹,

Palummo²,

Cortecchia³

et al. 2021

Preprint

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<div>With growing interest in the lead-free derivatives of the metal-halide perovskites (MHP), it is imperative to fully understand the contribution of the metal cation to their desirable excitonic characteristics. Here, we explore this question by performing an in-depth spectroscopic and theoretical analysis of phenethylammonium tin iodide ((PEA)<sub>2</sub>SnI<sub>4</sub>), a prototypical tin based MHP, and rigorously compare it with its lead counterpart. We elaborate on the origin of multiple excitonic resonances uniquely observed in the linear absorption spectrum of (PEA)<sub>2</sub>SnI<sub>4</sub> at energies about 200-300meV above the primary exciton. By performing calculations based on density functional theory and many- body perturbation theory, we suggest that the excitonic series at these higher energies are composed of electronic transitions from a lower lying valence band. Importantly, the valence band splitting is driven by the octahedral conformations that follow subtle variations in the organic-inorganic interactions within the crystal lattice. We experimentally show that the presence of the higher energy excitonic resonance results in a relatively slow nanosecond component in the formation dynamics of the primary exciton, in addition to the ultrafast phonon-driven hot carrier thermalization. While the presence of such slow relaxation channel for the excitons might be beneficial to many optoelectronic applications, our work suggests its possible control via systematic design of the organic cation. Moreover, our observations indicate that spin-orbit coupling does not play a primary role in the intricate yet crucial changes in the excitonic characteristics imparted by the tin substitution.</div>

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Establishing charge-transfer excitons in 2D perovskite heterostructures

Cited by 74 publications

References 59 publications

Photophysics of 2D Organic–Inorganic Hybrid Lead Halide Perovskites: Progress, Debates, and Challenges

Photophysics of 2D Organic–Inorganic Hybrid Lead Halide Perovskites: Progress, Debates, and Challenges

2D Nanomaterials for Effective Energy Scavenging

The Effect of Tin Substitution on the Excitonic Properties of Two Dimensional Metal Halide Perovskites

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