Unraveling photo-induced charge transfer properties at 3D/2D perovskite interfaces via in-situ surface photovoltage spectroscopy

Zhan, Kaidong; Ren, Xuecheng; Cheng, Pujia; Shi, Zhili; Lv, Wenjing; Qiao, Qiquan; Wu, Fan

doi:10.1016/j.apsusc.2023.157931

Cited by 12 publications

(2 citation statements)

References 17 publications

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“…The focus of recent efforts has been directed toward comprehending the mechanisms underlying photoinduced processes occurring at interfaces, employing a range of spectroscopic and imaging methodologies. , For instance, the utilization of nondestructive in situ photovoltage spectroscopy was implemented in order to investigate the phenomenon of charge transfer occurring at the nanoscale. The proposed methodology offers a distinctive means of exploring accelerated charge separation at the interface through the utilization of light-varying-frequency-dependent measurements . In addition to bilayer-based characterizations, there has been significant interest in investigating the device characteristics that arise from the incorporation of a 3D/2D heterojunction. , Although 2D perovskite-based passivating layers have been viewed as a positive addition to the system until now, recent research has presented contrary outcomes.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed methodology offers a distinctive means of exploring accelerated charge separation at the interface through the utilization of light-varying-frequency-dependent measurements. 15 In addition to bilayer-based characterizations, there has been significant interest in investigating the device characteristics that arise from the incorporation of a 3D/2D heterojunction. 16 , 17 Although 2D perovskite-based passivating layers have been viewed as a positive addition to the system until now, recent research has presented contrary outcomes.…”

Section: Introductionmentioning

confidence: 99%

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Unraveling Interface-Driven and Loss Mechanism-Centric Phenomena in 3D/2D Halide Perovskites: Prospects for Optoelectronic Applications

Singh,

Saykar,

Kumar

et al. 2024

ACS Omega

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In recent years, organic−inorganic metal halide perovskite solar cells (PSCs) have attracted considerable interest due to their remarkable and rapidly advancing efficiencies. Over the past decade, PSC efficiencies have significantly approached those of state-of-the-art silicon-based photovoltaics, making them a promising material. Currently, the scientific community widely recognizes the performance of 3D-PSCs and 2D-PSCs individually. However, when both are combined to form a heterostructure, the lattice and charge dynamics at the interface undergo a multitude of mechanisms that affect their performance. The interface between heterostructures facilitates the degradation of PSCs. The degradation pathways can be attributed to lattice distortions, inhomogeneous energy landscapes, interlayer ion migration, nonradiative recombination, and charge accumulation. This Review is dedicated to examining the phenomena that arise at the interface of 3D/2D halide perovskites and their related photophysical properties and loss mechanism processes. We mainly focus on the impact of lattice mismatch, energy level alignment, anomalous carrier dynamics, and loss mechanisms. We propose a "cause− impact−identify−rectify" approach to gain a comprehensive understanding of the ultrafast processes occurring within the material. Finally, we highlight the importance of advanced spectroscopic and imaging techniques in unraveling these intricate mechanisms. This discussion delves into the future possibilities of fabricating 3D/2D heterostructure-based optoelectronic devices, pushing the boundaries of performance across diverse fields. It envisions the creation of devices with unparalleled capabilities, exceeding the limitations of current technologies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unraveling Interface-Driven and Loss Mechanism-Centric Phenomena in 3D/2D Halide Perovskites: Prospects for Optoelectronic Applications

Singh,

Saykar,

Kumar

et al. 2024

ACS Omega

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In Situ Exploration of Dipole Field Effects on Weak Hysteresis in 3D/2D Perovskites

Chen,

Wu,

Pathak

et al. 2024

Adv Elect Materials

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This research delves into the effects of 2D layers on the functionality of 3D perovskite using lock‐in amplifier‐based in situ surface photovoltage (SPV) and its phase spectroscopy, with an emphasis on elucidating the connection between the tuning of dipole moments and the photocurrent hysteresis. Conventionally, the SPV of a perovskite/hole transport layer is observed to diminish as positive bias escalates. However, this trend is reversed in the case of 3D perovskite samples, where an augmentation in SPV is noted under positive bias. Notably, 3D/2D perovskite structures initially show a decrease, then an increase in SPV as bias intensifies, a phenomenon more pronounced with larger dipole moments in 2D. However, there is no linear relationship between the dipole moment and the hysteresis factor. Furthermore, using in situ light‐chopping‐frequency‐modulated SPV and Kelvin Probe Force Microscopy, it is revealed that the dipole fields of 2D layers can hinder ion migration. This leads to efficient hole transfer and minimal photocurrent hysteresis in 3D/2D perovskites, providing strong evidence for the underlying cause of hysteresis. Additionally, these findings suggest intricate interplays among the external electric field, interface dipole moments, and surface photovoltaics, offering significant insights into perovskite optoelectronics.

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Promoting Charge‐Carriers Dynamics by Relaxed Lattice Strain in A‐site‐Doped Halide Perovskite for Photocatalytic H₂ Evolution

Guo,

Zhang,

Liu

et al. 2024

Angewandte Chemie

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Because of the unique and superior optoelectronic properties, metal halide perovskites (MHPs) have attracted great interests in photocatalysis. Element doping strategy is adopted to modify perovskite materials to improve their photocatalytic performance. However, the contribution of bare doping‐site onto photocatalytic efficiency, and the correlation between doping locations and activity have not yet to be demonstrated. This promoted us to explore the potential of A‐site‐doped MHPs for photocatalysis. Herein, we dope potassium (K+) into CsPbBr3 and first reveal that the occupied locations of K+ in CsPbBr3 is lattice incorporation rather than surface segregation, which would change from A‐site substitution to interstitial site in lattice with the increase of K+ concentrations. Taking H2 evolution as a model reaction, photocatalytic activity of CsPbBr3 after K+ doping could be significantly improved ~11‐fold with A‐site substitution, which is superior to that of interstitial site doping. Moreover, other alkali metals including Li, Na, and Rb doping give the same results. The structure of photocatalysts during reaction confirmed the contribution of A‐site doping onto enhanced photocatalytic activity. Mechanistic insights show it is a result of the relaxed residual lattice strain induced promoted charge‐carriers dynamics and formed upward shifting of band after K+ A‐site doping.

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Unraveling photo-induced charge transfer properties at 3D/2D perovskite interfaces via in-situ surface photovoltage spectroscopy

Cited by 12 publications

References 17 publications

Unraveling Interface-Driven and Loss Mechanism-Centric Phenomena in 3D/2D Halide Perovskites: Prospects for Optoelectronic Applications

Unraveling Interface-Driven and Loss Mechanism-Centric Phenomena in 3D/2D Halide Perovskites: Prospects for Optoelectronic Applications

In Situ Exploration of Dipole Field Effects on Weak Hysteresis in 3D/2D Perovskites

Promoting Charge‐Carriers Dynamics by Relaxed Lattice Strain in A‐site‐Doped Halide Perovskite for Photocatalytic H₂ Evolution

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Unraveling photo-induced charge transfer properties at 3D/2D perovskite interfaces via in-situ surface photovoltage spectroscopy

Cited by 12 publications

References 17 publications

Unraveling Interface-Driven and Loss Mechanism-Centric Phenomena in 3D/2D Halide Perovskites: Prospects for Optoelectronic Applications

Unraveling Interface-Driven and Loss Mechanism-Centric Phenomena in 3D/2D Halide Perovskites: Prospects for Optoelectronic Applications

In Situ Exploration of Dipole Field Effects on Weak Hysteresis in 3D/2D Perovskites

Promoting Charge‐Carriers Dynamics by Relaxed Lattice Strain in A‐site‐Doped Halide Perovskite for Photocatalytic H2 Evolution

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Promoting Charge‐Carriers Dynamics by Relaxed Lattice Strain in A‐site‐Doped Halide Perovskite for Photocatalytic H₂ Evolution