Charge Separation in Type II Tunneling Structures of Close-packed CdTe and CdSe Nanocrystals

Nano Letters ◽  
2008 ◽  
Vol 8 (5) ◽  
pp. 1482-1485 ◽  
Author(s):  
Dieter Gross ◽  
Andrei S. Susha ◽  
Thomas A. Klar ◽  
Enrico Da Como ◽  
Andrey L. Rogach ◽  
...  
Keyword(s):  
Charge Separation ◽  
Cdse Nanocrystals ◽  
Type Ii

Charge Separation in Type II Tunneling Multilayered Structures of CdTe and CdSe Nanocrystals Directly Proven by Surface Photovoltage Spectroscopy

2010 ◽  
Vol 132 (17) ◽  
pp. 5981-5983 ◽  
Author(s):  
Dieter Gross ◽  
Iván Mora-Seró ◽  
Thomas Dittrich ◽  
Abdelhak Belaidi ◽  
Christian Mauser ◽  
...  
Keyword(s):  
Charge Separation ◽  
Surface Photovoltage ◽  
Cdse Nanocrystals ◽  
Type Ii ◽  
Multilayered Structures ◽  
Surface Photovoltage Spectroscopy

Ultrafast Charge Separation from Highly Reductive ZnTe/CdSe Type II Quantum Dots

2012 ◽  
Vol 3 (15) ◽  
pp. 2052-2058 ◽  
Author(s):  
Shengye Jin ◽  
Jun Zhang ◽  
Richard D. Schaller ◽  
Tijana Rajh ◽  
Gary P. Wiederrecht
Keyword(s):  
Quantum Dots ◽  
Charge Separation ◽  
Type Ii

scholarly journals Ultrafast Charge Separation in Bilayer WS2/Graphene Heterostructure Revealed by Time- and Angle-Resolved Photoemission Spectroscopy

2021 ◽  
Vol 9 ◽  
Author(s):  
Razvan Krause ◽  
Mariana Chávez-Cervantes ◽  
Sven Aeschlimann ◽  
Stiven Forti ◽  
Filippo Fabbri ◽  
...  
Keyword(s):  
Charge Separation ◽  
Graphene Layer ◽  
Optoelectronic Devices ◽  
Visible Spectral Range ◽  
Band Alignment ◽  
Photoemission Spectroscopy ◽  
Type I ◽  
Type Ii ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Indirect Band Gap

Efficient light harvesting devices need to combine strong absorption in the visible spectral range with efficient ultrafast charge separation. These features commonly occur in novel ultimately thin van der Waals heterostructures with type II band alignment. Recently, ultrafast charge separation was also observed in monolayer WS2/graphene heterostructures with type I band alignment. Here we use time- and angle-resolved photoemission spectroscopy to show that ultrafast charge separation also occurs at the interface between bilayer WS2 and graphene indicating that the indirect band gap of bilayer WS2 does not affect the charge transfer to the graphene layer. The microscopic insights gained in the present study will turn out to be useful for the design of novel optoelectronic devices.

Chiroptical Activity of Type II Core/Shell Cu2S/CdSe Nanocrystals

2019 ◽  
Vol 58 (9) ◽  
pp. 6534-6543 ◽  
Author(s):  
Xiao Shao ◽  
Tianyong Zhang ◽  
Bin Li ◽  
Minghao Zhou ◽  
Xiaoyuan Ma ◽  
...  
Keyword(s):  
Cdse Nanocrystals ◽  
Core Shell ◽  
Type Ii

scholarly journals The effect of dielectric friction on the rate of charge separation in type II ZnSe/CdS semiconductor nanorods

2009 ◽  
Vol 94 (13) ◽  
pp. 133113 ◽  
Author(s):  
Nishshanka N. Hewa-Kasakarage ◽  
Patrick Z. El-Khoury ◽  
Nickolas Schmall ◽  
Maria Kirsanova ◽  
Alexander Nemchinov ◽  
...  
Keyword(s):  
Charge Separation ◽  
Type Ii ◽  
Dielectric Friction

Highly-efficient heterojunction solar cells based on two-dimensional tellurene and transition metal dichalcogenides

2019 ◽  
Vol 7 (13) ◽  
pp. 7430-7436 ◽  
Author(s):  
Kai Wu ◽  
Huanhuan Ma ◽  
Yunzhi Gao ◽  
Wei Hu ◽  
Jinlong Yang
Keyword(s):  
Solar Cells ◽  
Transition Metal ◽  
Charge Separation ◽  
Transition Metal Dichalcogenides ◽  
Band Alignment ◽  
Type Ii ◽  
Two Dimensional ◽  
Heterojunction Solar Cells ◽  
Highly Efficient ◽  
Metal Dichalcogenides

Tellurene and TMDs show desirable type II band alignment for constructing highly-efficient heterojunction solar cells with strong charge separation and enhanced sunlight absorption.

Interfacial Charge Separation and Recombination in InP and Quasi-Type II InP/CdS Core/Shell Quantum Dot-Molecular Acceptor Complexes

2013 ◽  
Vol 117 (32) ◽  
pp. 7561-7570 ◽  
Author(s):  
Kaifeng Wu ◽  
Nianhui Song ◽  
Zheng Liu ◽  
Haiming Zhu ◽  
William Rodríguez-Córdoba ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Charge Separation ◽  
Core Shell ◽  
Type Ii ◽  
Interfacial Charge

Atomistic effect of laterally and vertically growth shell on physical behaviours of CdSe/CdTe type-II core/crown and core/shell nanoplatelets: tight-binding theory

2021 ◽  
Vol 96 (12) ◽  
pp. 125867
Author(s):  
Worasak Sukkabot
Keyword(s):  
Charge Separation ◽  
Tight Binding ◽  
Band Gaps ◽  
Core Shell ◽  
Type Ii ◽  
Binding Theory ◽  
Theoretical Understanding ◽  
Spatial Charge ◽  
The Impact ◽  
Cdte Core

Abstract Utilizing the atomistic tight-binding theory, the impact of the lateral and vertical potential confinement by the coated shell on the CdSe/CdTe core/crown and core/shell nanoplatelets (NPLs) is attained. The spatial charge separation and encapsulated shell have a noteworthy impact on the electronic structures and optical properties because of the type-II band profile. The reduced band gaps with the growing laterally and vertically passivated shell thicknesses are due to the quantum confinement phenomena. The optical band gaps adjusted across the visible light are achieved by the shell thickness change. The excitonic binding energies of CdSe/CdTe core/shell NPLs are larger than those of CdSe/CdTe core/crown NPLs. Thanks to the spatial charge separation, a shortening of the oscillation strengths is concomitant with an increase of the radiative lifetimes. Overall, this scientific research underlines the importance of the theoretical understanding and practical control by lateral and vertical confinement of heterostructure NPLs.

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