Size-Dependent Hot Carrier Dynamics in Perovskite Nanocrystals Revealed by Two-Dimensional Electronic Spectroscopy

Square-shaped layered FA2PbI4 perovskite crystals were prepared using a one-step vapour deposition method, and the hot carrier dynamics of these crystals was studied.

Download Full-text

Tunable nonlinear optical responses and carrier dynamics of two-dimensional antimonene nanosheets

Nanoscale Horizons ◽

10.1039/d0nh00262c ◽

2020 ◽

Vol 5 (10) ◽

pp. 1420-1429 ◽

Cited By ~ 2

Author(s):

Lei Zhang ◽

Shah Fahad ◽

Hao-Ran Wu ◽

Tao-Tao Dong ◽

Zi-Zhen Chen ◽

...

Keyword(s):

Nonlinear Optical ◽

Strong Influence ◽

Optical Response ◽

Carrier Dynamics ◽

Nonlinear Optical Response ◽

Two Dimensional ◽

Size Dependent ◽

Optical Responses ◽

Size Controlled

We developed a size-controlled intercalation method to prepare Sb nanosheets. A distinct size-dependent nonlinear optical response, unveiling the strong influence of the scale of the Sb nanosheets on the carrier dynamics was observed.

Download Full-text

Size-Dependent Biexciton Quantum Yields and Carrier Dynamics of Quasi-Two-Dimensional Core/Shell Nanoplatelets

ACS Nano ◽

10.1021/acsnano.7b03943 ◽

2017 ◽

Vol 11 (9) ◽

pp. 9119-9127 ◽

Cited By ~ 35

Author(s):

Xuedan Ma ◽

Benjamin T. Diroll ◽

Wooje Cho ◽

Igor Fedin ◽

Richard D. Schaller ◽

...

Keyword(s):

Carrier Dynamics ◽

Quantum Yields ◽

Core Shell ◽

Two Dimensional ◽

Size Dependent

Download Full-text

Two-dimensional electronic spectroscopy reveals liquid-like lineshape dynamics in CsPbI3 perovskite nanocrystals

Nature Communications ◽

10.1038/s41467-019-12830-1 ◽

2019 ◽

Vol 10 (1) ◽

Cited By ~ 12

Author(s):

Hélène Seiler ◽

Samuel Palato ◽

Colin Sonnichsen ◽

Harry Baker ◽

Etienne Socie ◽

...

Keyword(s):

Electronic Spectroscopy ◽

Two Dimensional ◽

Defect Tolerance ◽

Perovskite Nanocrystals ◽

Optical Signature ◽

Diffusive Dynamics ◽

Dynamical Coupling ◽

Halide Perovskites ◽

Polaron Formation ◽

Ionic Lattice

Abstract Lead-halide perovskites have attracted tremendous attention, initially for their performance in thin film photovoltaics, and more recently for a variety of remarkable optical properties. Defect tolerance through polaron formation within the ionic lattice is a key aspect of these materials. Polaron formation arises from the dynamical coupling of atomic fluctuations to electronic states. Measuring the properties of these fluctuations is therefore essential in light of potential optoelectronic applications. Here we apply two-dimensional electronic spectroscopy (2DES) to probe the timescale and amplitude of the electronic gap correlations in CsPbI3 perovskite nanocrystals via homogeneous lineshape dynamics. The 2DES data reveal irreversible, diffusive dynamics that are qualitatively inconsistent with the coherent dynamics in covalent solids such as CdSe quantum dots. In contrast, these dynamics are consistent with liquid-like structural dynamics on the 100 femtosecond timescale. These dynamics are assigned to the optical signature of polaron formation, the conceptual solid-state analogue of solvation.

Download Full-text

Slow Cooling and Highly Efficient Extraction of Hot-Carriers in Perovskite Nanocrystals: Towards Hot-Carrier Perovskite Solar Cell

10.29363/nanoge.fallmeeting.2018.042 ◽

2018 ◽

Author(s):

Mingjie Li ◽

Tze Chien Sum

Keyword(s):

Solar Cell ◽

Perovskite Solar Cell ◽

Hot Carriers ◽

Slow Cooling ◽

Perovskite Nanocrystals ◽

Hot Carrier ◽

Highly Efficient ◽

Efficient Extraction

Download Full-text

Precise Large Deviations for Sums of Claim-size Vectors in a Two-dimensional Size-dependent Renewal Risk Model

Acta Mathematicae Applicatae Sinica English Series ◽

10.1007/s10255-021-1030-z ◽

2021 ◽

Vol 37 (3) ◽

pp. 539-547

Author(s):

Ke-ang Fu ◽

Xin-mei Shen ◽

Hui-jie Li

Keyword(s):

Large Deviations ◽

Risk Model ◽

Claim Size ◽

Two Dimensional ◽

Precise Large Deviations ◽

Renewal Risk Model ◽

Size Dependent ◽

Renewal Risk

Download Full-text

Effects of Crystal Morphology on the Hot-Carrier Dynamics in Mixed-Cation Hybrid Lead Halide Perovskites

Energies ◽

10.3390/en14030708 ◽

2021 ◽

Vol 14 (3) ◽

pp. 708

Author(s):

Daniele Catone ◽

Giuseppe Ammirati ◽

Patrick O’Keeffe ◽

Faustino Martelli ◽

Lorenzo Di Mario ◽

...

Keyword(s):

High Sensitivity ◽

Carrier Dynamics ◽

Large Area ◽

Photovoltaic Properties ◽

Time Resolved ◽

Hot Carrier ◽

Mixed Cation ◽

Small Crystals ◽

Characterization Of Materials ◽

Lead Halide

Ultrafast pump-probe spectroscopies have proved to be an important tool for the investigation of charge carriers dynamics in perovskite materials providing crucial information on the dynamics of the excited carriers, and fundamental in the development of new devices with tailored photovoltaic properties. Fast transient absorbance spectroscopy on mixed-cation hybrid lead halide perovskite samples was used to investigate how the dimensions and the morphology of the perovskite crystals embedded in the capping (large crystals) and mesoporous (small crystals) layers affect the hot-carrier dynamics in the first hundreds of femtoseconds as a function of the excitation energy. The comparative study between samples with perovskite deposited on substrates with and without the mesoporous layer has shown how the small crystals preserve the temperature of the carriers for a longer period after the excitation than the large crystals. This study showed how the high sensitivity of the time-resolved spectroscopies in discriminating the transient response due to the different morphology of the crystals embedded in the layers of the same sample can be applied in the general characterization of materials to be used in solar cell devices and large area modules, providing further and valuable information for the optimization and enhancement of stability and efficiency in the power conversion of new perovskite-based devices.

Download Full-text

Manipulation of hot carrier cooling dynamics in two-dimensional Dion–Jacobson hybrid perovskites via Rashba band splitting

Nature Communications ◽

10.1038/s41467-021-24258-7 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Jun Yin ◽

Rounak Naphade ◽

Partha Maity ◽

Luis Gutiérrez-Arzaluz ◽

Dhaifallah Almalawi ◽

...

Keyword(s):

Transient Absorption ◽

Phonon Scattering ◽

Transient Absorption Spectroscopy ◽

Band Model ◽

Two Dimensional ◽

Spintronic Devices ◽

Hot Carrier ◽

Band Splitting ◽

Perovskite Materials ◽

Spin Polarized

AbstractHot-carrier cooling processes of perovskite materials are typically described by a single parabolic band model that includes the effects of carrier-phonon scattering, hot phonon bottleneck, and Auger heating. However, little is known (if anything) about the cooling processes in which the spin-degenerate parabolic band splits into two spin-polarized bands, i.e., the Rashba band splitting effect. Here, we investigated the hot-carrier cooling processes for two slightly different compositions of two-dimensional Dion–Jacobson hybrid perovskites, namely, (3AMP)PbI4 and (4AMP)PbI4 (3AMP = 3-(aminomethyl)piperidinium; 4AMP = 4-(aminomethyl)piperidinium), using a combination of ultrafast transient absorption spectroscopy and first-principles calculations. In (4AMP)PbI4, upon Rashba band splitting, the spin-dependent scattering of hot electrons is responsible for accelerating hot-carrier cooling at longer delays. Importantly, the hot-carrier cooling of (4AMP)PbI4 can be extended by manipulating the spin state of the hot carriers. Our findings suggest a new approach for prolonging hot-carrier cooling in hybrid perovskites, which is conducive to further improving the performance of hot-carrier-based optoelectronic and spintronic devices.

Download Full-text