Ultrafast photoinduced carrier dynamics in single crystalline perovskite films

Huo, Tianyu; Yan, Lihe; Si, Jinhai; Ma, Peipei; Hou, Xun

doi:10.1039/d2tc03632k

Cited by 15 publications

(7 citation statements)

References 47 publications

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“…In-depth photophysical property analysis was conducted via transient absorption spectroscopy (TAS). [58][59][60][61] Figure 7 and Figure S5 (Supporting Information) include all testing results and analysis of D18-Fu/L8-BO neat films and their blend systems processed in three different ways. First, a 400 nm pump was used to screen the features of the polymer donor, while an 800 nm pump was used for L8-BO detection.…”

Section: Resultsmentioning

confidence: 99%

An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

Chen

et al. 2023

Advanced Materials

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Currently, nearly all high‐efficiency organic photovoltaic devices use donor polymers based on the benzo‐dithiophene (BDT) unit. To diversify the choices of building blocks for high‐performance donor polymers, the use of benzo‐difuran (BDF) units is explored, which can achieve reduced steric hindrance, stronger molecular packing, and tunable energy levels. In previous research, the performance of BDF‐based devices lagged behind those of BDT‐based devices. In this study, a high efficiency (18.4%) is achieved using a BDF‐based polymer donor, which is the highest efficiency reported for BDF donor materials to date. The high efficiency is enabled by a donor polymer (D18‐Fu) and the aid of a solid additive (2‐chloronaphthalene), which is the isomer of the commonly used additive 1‐chloronaphthalene. These results revealed the significant effect of 2‐chloronaphthalene in optimizing the morphology and enhancing the device parameters. This work not only provides a new building block that can achieve an efficiency comparable to dominant BDT units but also proposes a new solid additive that can replace the widely used 1‐chloronaphthalene additive.

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Section: Resultsmentioning

confidence: 99%

An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

Chen

et al. 2023

Advanced Materials

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“…24 While the 530 nm peak can be interpreted as the absorption of probe photons by electrons in the lowest energy level of the valence band after pump light excitation, the modulation of the carrier distribution may be associated with enhanced exciton absorption. 24,55 As the delay time increases, the n = ∞ signal merges with a broad and continuous bleaching signal, gradually forming a tightly packed flat energy domain that arises from the bleaching of several exciton trap states extending from 560 to 800 nm, 56,57 corresponding to other high-n species that may be present in the heterostructure.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Ultrafast All-Optical Modulation and Efficient Third-Harmonic Generation in Two-Dimensional Perovskite Heterostructures

He,

Hong,

Huang

et al. 2024

ACS Photonics

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Ultrafast all-optical modulation and efficient frequency conversion are highly required for a wide range of applications including optical communication, microwave photonics, and quantum computing. However, the ultrafast and efficient light−matter interactions are challenging for the available optoelectronic materials. Here, we demonstrate the solutionprocessable two-dimensional halide organic−inorganic perovskite (2D HOIP) heterostructures can exhibit ultrafast all-optical modulation and efficient third-harmonic generation experimentally. We fabricated 2D HOIP heterostructure film (PEA) 2 PbI 4 / (PEA) 2 (MA) 2 Pb 3 I 10 by a one-step spin-casting method and found that the heterostructures can produce efficient third-harmonic emission with larger conversion efficiency (η = 2 × 10 −5 ) than other typical perovskites and two-dimensional materials. In addition, the time-resolved transient absorption spectroscopy reveals the transfer path of photocarriers in perovskite heterostructures, while sub-picosecond ultrafast relaxation and ∼−4.85% nonlinear absorption modulation have been observed at the band edge. Our results suggest that 2D HOIP heterostructures can serve as an ideal platform for nonlinear optical modulation and wavelength conversion and may pave the way for developing high-performance cost-effective ultrafast optoelectronic devices.

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“…35,36 The liquid phase exfoliation method refers to BP powder being separated in certain organic solvents and treated by an ultrasonic generator, leading to the exfoliation of BP molecular layers by the cavitation effect to form BPene. 37 Guo added bulk BP to a saturated NaOH NMP solution to obtain BPene through this method. 38 In the electrochemical exfoliation method, the BP anode, and Pt cathode are immersed into an H 2 SO 4 solution (0.5 mol L À1 ) to generate a sustainable voltage.…”

Section: Introductionmentioning

confidence: 99%

Preparation and formation mechanism of few-layer black phosphorene through liquid pulsed discharge

et al. 2023

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Ultrafast photoinduced carrier dynamics in single crystalline perovskite films

Abstract: Photoinduced carrier dynamics of CsPbBr3 single crystalline perovskite film were studied using femtosecond time-resolved transient absorption (TA) microscopy with a spatial resolution of sub-micron. TA spectra of the internal area...

Cited by 15 publications

References 47 publications

An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

Ultrafast All-Optical Modulation and Efficient Third-Harmonic Generation in Two-Dimensional Perovskite Heterostructures

Preparation and formation mechanism of few-layer black phosphorene through liquid pulsed discharge

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