One-step vapour phase growth of two-dimensional formamidinium-based perovskite and its hot carrier dynamics

2020 ◽  
Vol 22 (37) ◽  
pp. 21512-21519
Author(s):  
Ufuk Erkılıç ◽  
Hyun Goo Ji ◽  
Eiji Nishibori ◽  
Hiroki Ago
Keyword(s):  
Vapour Deposition ◽  
Vapour Phase ◽  
Carrier Dynamics ◽  
Two Dimensional ◽  
Deposition Method ◽  
Phase Growth ◽  
Hot Carrier ◽  
One Step

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.

Superconductivity and magnetotransport of single-crystalline NbSe2nanoplates grown by chemical vapour deposition

Nanoscale ◽  
2017 ◽  
Vol 9 (43) ◽  
pp. 16591-16595 ◽  
Author(s):  
Yi-Chao Zou ◽  
Zhi-Gang Chen ◽  
Enze Zhang ◽  
Faxian Xiu ◽  
Syo Matsumura ◽  
...  
Keyword(s):  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Two Dimensional ◽  
Deposition Method ◽  
High Quality ◽  
Single Crystalline ◽  
Dimensional Characteristic ◽  
Chemical Vapour Deposition Method

High-quality NbSe2nanoplates can be grown by a facile chemical vapour deposition method, exhibiting a two-dimensional characteristic in their superconductivities.

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

Energies ◽  
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.

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

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.

Hot Carrier Dynamics and Charge Trapping in Surface Passivated β-CsPbI3 Inorganic Perovskite

2021 ◽  
pp. 6907-6913
Author(s):  
Xian Wang ◽  
Dayujia Huo ◽  
Xin Wang ◽  
Minjie Li ◽  
Yong Wang ◽  
...  
Keyword(s):  
Charge Trapping ◽  
Carrier Dynamics ◽  
Inorganic Perovskite ◽  
Hot Carrier
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