Article
Materials Science, Multidisciplinary
S. Monika, M. Mahalakshmi, K. Veerathangam, M. Senthil Pandian, P. Ramasamy
Summary: CuS is widely used as a counter electrode material in QDSSCs. In this study, carbon black was used as a scaffolding material to improve the performance of CuS counter electrode. The results showed that the carbon black significantly enhanced the power conversion efficiency of QDSSC.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Analytical
Jidong Wang, Zhihong Gao, Min Dong, Jian Li, Hong Jiang, Jingying Xu, Jianmin Gu, Desong Wang
Summary: A sandwich PEC cytosensor based on CdSe@CdS QD-sensitized Au NP/a-Fe2O3 was developed for ultrasensitive detection of CTCs. The sensor showed high sensitivity and selectivity, and could accurately detect CTCs in serum samples.
Article
Energy & Fuels
Wenlei Lv, Yilong Lei, Jianping Deng, Junfei Fang, Wendeng Huang
Summary: Metal ion doping is an effective method to improve the optical and electrical properties of quantum dots (QDs). In this study, Zn-doped CdS and CdSe QDs were synthesized using the SILAR method and utilized in the construction of sensitized solar cells (QDSSCs). The results showed that Zn doping significantly enhanced the power conversion efficiency (PCE) of the QDSSCs by improving the current density, open-circuit voltage, and light absorbance. The Zn doping also reduced the interfacial charge recombination rate and prolonged the electron lifetime, resulting in more efficient charge collection in the QDSSCs.
Article
Physics, Multidisciplinary
Worasak Sukkabot
Summary: This study investigates the modification of electronic structures and optical properties of CdSe/CdS dot-in-rod nanocrystals by changing the core and rod diameters. Excitonic band gaps across visible light spectra are observed by varying the core and rod sizes, with the best performance occurring at a 3.0 nm CdSe core diameter.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Dongyang Wang, Hao Yang, Junhong Duan, Weiqing Liu, Huaming Wu
Summary: A novel photoanode based on CdSe/CdS@SnO2 core/shell nanoparticles was fabricated for highly efficient quantum dots and dye-sensitized tandem solar cells. The introduction of a SnO2 nanolayer in the CdSe/CdS@SnO2 at N719 device avoids quantum dots corrosion and collects electrons from surrounding N719 and CdSe/CdS core, transferring them to the front FTO electrode. Photovoltaic performance tests demonstrate the enhanced stability of the cell, with no attenuation in short-circuit current J(sc) and gradual increase in open-circuit voltage V-oc, resulting in improved photoelectric conversion efficiency. An optimal power conversion efficiency (PCE) of 5.43% is achieved for tandem solar cells.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Optics
Vladimir Pavlenko, Igor Beloussov
Summary: The dynamic and spectral characteristics of close-packed quantum dots excited by a -30 ps long laser pulse in a film prepared by a drop casting method from toluene solution were investigated. The wavelength of photoluminescence of single excitons and the wavelength of amplified spontaneous radiation associated with a stimulated decay of biexcitons were obtained. The dynamics of these two types of radiation were analyzed from the spectrogram of the time-resolved photoluminescence. It was found that the peak maximum of single excitons appears later than the maximum of amplified spontaneous radiation, and slowly narrows and diminishes over time. The amplified spontaneous radiation lasts for 200 ps.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Danwen Yao, Zhenyu Hu, Liansheng Zheng, Shanming Chen, Wei Lu, Huailiang Xu
Summary: The research focuses on the fabrication of CdS/CdSe-sensitized quantum dot sensitized solar cells (QDSSCs) using laser-engineered black rutile TiO2 nanoparticles (TiO2-NPs) as the photoanode material. The results show that the devices based on black TiO2-NPs have significantly higher power conversion efficiency (PCE) compared to those using pristine TiO2-NPs. Analysis of absorption and electrochemical impedance spectroscopy indicates that the device with the highest PCE has the highest absorption efficiency in a wide spectral range and the smallest series resistance, which can be attributed to the surface modification of TiO2-NPs by femtosecond laser pulses.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Jia Guo, Hualong Chen, Feng Zhang, Kaiyun Chen, S. Wageh, Ahmed A. Al-Ghamdi, Huanian Zhan, Wenlong He, Songrui Wei, Weichun Huang, Jun Liu, Han Zhang
Summary: This study successfully synthesized CdS@CdSe core-shell quantum dots and revealed their characteristics through femtosecond transient absorption studies and theoretical calculations, indicating their potential applications in optoelectronics and photovoltaics.
Article
Chemistry, Physical
Ali Reza Amani-Ghadim, Mahtab Mousavi, Farzaneh Bayat
Summary: In this study, a novel sensitizer for QDSSCs was developed using CdTe@Dy-doped CdS core/shell quantum dots (QDs) cosensitized with CdSe QDs. The CdTe/CdS type-II core/shell structure QDs exhibited a wide absorption range, fast electron injection, and slower recombination rate.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Tianwei Duan, Jing Ai, Sujie Chen, Gufeng He, Xiaojun Guo, Lu Han, Shunai Che, Yingying Duan
Summary: Researchers have fabricated chiral quantum dot-light-emitting diodes (CQLEDs) with circularly polarized electroluminescence (CPEL) through spin-coating evaporation of colloidal solution on a substrate. These CQLEDs have potential applications in future display, communication, and storage industries.
Review
Biochemistry & Molecular Biology
Nguyen Thi Kim Chung, Phat Tan Nguyen, Ha Thanh Tung, Dang Huu Phuc
Summary: This study provides an overview of quantum dot application in solar cells, replacing dye molecules. The different types of quantum dot sensitized solar cells are presented with obtained results and their respective advantages and disadvantages. Lastly, methods for improving efficiency performance in future research are proposed.
Article
Materials Science, Multidisciplinary
J. Luo, J. C. Liu, Z. Q. Zhao, S. H. Sun, Y. Zhu, Y. M. Hu
Summary: Orthogonal Cu3SnS4 (CTS) nano-crystals were synthesized, with Cu7S4 seeds forming first at 130 degrees C and orthorhombic CTS nano-crystals forming at 180 degrees C. Selenization at 500 degrees C for 20 minutes resulted in the formation of CTSXSe4-X, which showed good conductivity and electrocatalytic activity for I-3(-) reduction when used as counter electrodes in dye-sensitized solar cells. The optimal 1.7 μm thick CTSXSe4-X counter electrode achieved a power conversion efficiency of 7.57%.
Article
Chemistry, Multidisciplinary
Lars F. Klepzig, Nils C. Keppler, Dominik A. Rudolph, Andreas Schaate, Peter Behrens, Jannika Lauth
Summary: In this work, thin composite films of zeolitic imidazolate frameworks (ZIFs) and colloidal two-dimensional (2D) core-crown CdSe/CdS nanoplatelet (NPL) emitters are formed, which exhibit high transparency and strong and narrow photoluminescence properties. The porous ZIF matrix acts as functional encapsulation and enables the adsorption/desorption of guest molecules. The resulting composite films have improved transmittance, anti-reflection ability, and reversible photoluminescence change, showing potential applications in gas sensing.
Article
Chemistry, Physical
Rosinildo Fideles do Nascimento, Anielle Christine Almeida Silva, Tasso O. Sales, Artur F. Sonsin, Eduardo Jorge da Silva Fonseca, Samuel T. Souza, Ygor M. de Oliveira, Fabiane C. de Abreu, Noelio Oliveira Dantas
Summary: The study demonstrates that the ratio of CdSe/CdS ultrasmall quantum dots conjugated with reduced graphene oxide significantly affects the properties of the nanocomposites, with a higher proportion of USQDs leading to luminescence quenching and an increase in nonradiative decay rate due to electron transfer processes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Xiuqing Bai, Huiyu Li, Yonggang Peng, Guofeng Zhang, Changgang Yang, Wenli Guo, Xue Han, Jialu Li, Ruiyun Chen, Chengbing Qin, Jianyong Hu, Gaoling Yang, Haizheng Zhong, Liantuan Xiao, Suotang Jia
Summary: This study investigates the effect of aspect ratios of CdS nanorods on the photoluminescence emission of CdSe/CdS dot-in-rod nanocrystals using single-dot photoluminescence spectroscopy. The results show that as the aspect ratio increases, the photoluminescence quantum yield and lifetime decrease, while photoluminescence blinking is suppressed and the effect on the photoluminescence spectrum is less significant.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)