Interfacial Engineering Determines Band Alignment and Steers Charge Separation and Recombination at an Inorganic Perovskite Quantum Dot/WS2 Junction: A Time Domain Ab Initio Study

2019 ◽  
Vol 10 (6) ◽  
pp. 1234-1241 ◽  
Author(s):  
Siyu Wang ◽  
Qiquan Luo ◽  
Wei-Hai Fang ◽  
Run Long
Keyword(s):  
Quantum Dot ◽  
Ab Initio ◽  
Time Domain ◽  
Charge Separation ◽  
Band Alignment ◽  
Ab Initio Study ◽  
Inorganic Perovskite ◽  
Interfacial Engineering

Time-Domain Ab Initio Study of Phonon-Induced Relaxation of Plasmon Excitations in a Silver Quantum Dot

2012 ◽  
Vol 116 (28) ◽  
pp. 15034-15040 ◽  
Author(s):  
Amanda J. Neukirch ◽  
Zhenyu Guo ◽  
Oleg V. Prezhdo
Keyword(s):  
Quantum Dot ◽  
Ab Initio ◽  
Time Domain ◽  
Ab Initio Study

scholarly journals Carbon Nanodots as a Potential Transport Layer for Boosting Performance of All-Inorganic Perovskite Nanocrystals-based Photodetector

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 717
Author(s):  
Hassan Algadi ◽  
Ahmad Umar ◽  
Hasan Albargi ◽  
Turki Alsuwian ◽  
Sotirios Baskoutas
Keyword(s):  
Charge Separation ◽  
High Performance ◽  
Band Alignment ◽  
Transport Layer ◽  
Carbon Nanodots ◽  
Separation Mechanism ◽  
Perovskite Layer ◽  
Inorganic Perovskite ◽  
Highly Efficient ◽  
Efficient Charge

A low-cost and simple drop-casting method was used to fabricate a carbon nanodot (C-dot)/all-inorganic perovskite (CsPbBr3) nanosheet bilayer heterojunction photodetector on a SiO2/Si substrate. The C-dot/perovskite bilayer heterojunction photodetector shows a high performance with a responsivity (R) of 1.09 A/W, almost five times higher than that of a CsPbBr3-based photodetector (0.21 A/W). In addition, the hybrid photodetector exhibits a fast response speed of 1.318/1.342 µs and a highly stable photocurrent of 6.97 µA at 10 V bias voltage. These figures of merits are comparable with, or much better than, most reported perovskite heterojunction photodetectors. UV–Vis absorption and photoluminescent spectra measurements reveal that the C-dot/perovskite bilayer heterojunction has a band gap similar to the pure perovskite layer, confirming that the absorption and emission in the bilayer heterojunction is dominated by the top layer of the perovskite. Moreover, the emission intensity of the C-dot/perovskite bilayer heterojunction is less than that of the pure perovskite layer, indicating that a significant number of charges were extracted by the C-dot layer. The studied band alignment of the C-dots and perovskites in the dark and under emission reveals that the photodetector has a highly efficient charge separation mechanism at the C-dot/perovskite interface, where the recombination rate between photogenerated electrons and holes is significantly reduced. This highly efficient charge separation mechanism is the main reason behind the enhanced performance of the C-dot/perovskite bilayer heterojunction photodetector.

Ab Initio Time-Domain Study of Phonon-Assisted Relaxation of Charge Carriers in a PbSe Quantum Dot

2007 ◽  
Vol 111 (12) ◽  
pp. 4871-4878 ◽  
Author(s):  
Svetlana V. Kilina ◽  
Colleen F. Craig ◽  
Dmitri S. Kilin ◽  
Oleg V. Prezhdo
Keyword(s):  
Quantum Dot ◽  
Ab Initio ◽  
Time Domain ◽  
Charge Carriers

Weak temperature-dependent hole injection and electron–hole recombination at the CH3NH3PbI3/NiO heterojunction: a time-domain ab initio study

2020 ◽  
Vol 8 (2) ◽  
pp. 607-615 ◽  
Author(s):  
Jinlu He ◽  
Wei-Hai Fang ◽  
Run Long
Keyword(s):  
Charge Carrier ◽  
Ab Initio ◽  
Time Domain ◽  
Carrier Dynamics ◽  
Hole Injection ◽  
Ab Initio Study ◽  
Temperature Dependent ◽  
Electron Hole ◽  
Charge Carrier Dynamics ◽  
Hole Recombination

Weak temperature-dependent photoexcitation charge carrier dynamics in the CH3NH3PbI3/NiO heterojunction.

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