Article
Chemistry, Physical
Jae-Hwan Choi, Min -Jae Si, Sol -Hee Kim, Nipuni Maniyamgama, Dongeon Kim, Seungin Jee, Yun Hoo Kim, Hoon-Seok Jeong, Beomkwan Kim, Changjo Kim, Jung -Yong Lee, Se-Woong Baek
Summary: This study demonstrates the successful preparation of a stable hybrid ink by modifying the synthesis route of nanoparticles, which enables the formation of efficient heterostructured thin films and improves the power conversion efficiency of solar cells.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Long Hu, Qi Lei, Xinwei Guan, Robert Patterson, Jianyu Yuan, Chun-Ho Lin, Jiyun Kim, Xun Geng, Adnan Younis, Xianxin Wu, Xinfeng Liu, Tao Wan, Dewei Chu, Tom Wu, Shujuan Huang
Summary: The research demonstrates that using potassium triiodide (KI3) additives can effectively optimize the surface chemistry of PbS CQDs, eliminate undesired atom configurations and surface defects, reduce surface trap states, and significantly improve device stability and efficiency.
Article
Chemistry, Multidisciplinary
Evert Dhaene, Rohan Pokratath, Olivia Aalling-Frederiksen, Kirsten M. O. Jensen, Philippe F. Smet, Klaartje De Buysser, Jonathan De Roo
Summary: Ligands known as monoalkyl phosphinic acids were found to be a class of interesting ligands for the synthesis of high-temperature nanocrystals. These ligands have a reactivity intermediate between carboxylates and phosphonates, and they do not form anhydride oligomers like phosphonic acids. Nanocrystals synthesized with these ligands have low polydispersity and high quantum yield. Additionally, these ligands can be used to synthesize nanorods with high shape purity. The introduction of this intermediate class of ligands enhances the versatility of surfactant-assisted syntheses.
Article
Multidisciplinary Sciences
Jin Hae Kim, Hyokeun Park, Tae-Gon Kim, Hyunmi Lee, Shinae Jun, Eunha Lee, Woo Sung Jeon, Jaegwan Chung, In-Sun Jung
Summary: Colloidal quantum-dots are attractive for optoelectronic applications due to their easy maneuverability, high functionality, wide applicability, and low cost. A new method has been developed to disrupt the interaction between the inorganic particle and organic ligands on the surface of QDs, facilitating accurate analysis of the ligands.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Mingxu Zhang, Qisen Zhou, Xinyi Mei, Jingxuan Chen, Junming Qiu, Xiuzhi Li, Shuang Li, Mubing Yu, Chaochao Qin, Xiaoliang Zhang
Summary: By using dimethylammonium iodide (DMAI) as an additive instead of ammonium acetate (AA) for the liquid-state ligand exchange, the liquid-state ligand exchange of colloidal quantum dots (CQDs) can be improved, reducing the charge-transport barriers within the CQD solids and improving the photovoltaic performance of CQD solar cells (CQDSCs). The improved surface passivation of CQDs and the facilitated charge-carrier transport within the CQD solids are responsible for the enhanced performance in DMAI-based CQDSCs, compared to AA-based CQDSCs.
ACTA PHYSICO-CHIMICA SINICA
(2023)
Article
Chemistry, Multidisciplinary
Qiwei Xu, I. Teng Cheong, Lingju Meng, Jonathan G. C. Veinot, Xihua Wang
Summary: The study demonstrates the importance of Si surface passivation for the construction of high-performance Si:CQD photodetectors. The two-step passivated Si:CQD interface shows fewer trap states and decreased recombination rates, leading to a higher external quantum efficiency in infrared photodiodes.
Article
Chemistry, Multidisciplinary
Xingyu Shen, John C. Peterson, Philippe Guyot-Sionnest
Summary: Mid-infrared HgTe colloidal quantum dot electroluminescent devices with high external quantum efficiency and power conversion efficiency were demonstrated. The power conversion efficiency was improved by reducing the resistance of the transparent electrode through the incorporation of a metal conductive grid.
Article
Chemistry, Physical
Byeongsu Kim, Se-Woong Baek, Changjo Kim, Junho Kim, Jung-Yong Lee
Summary: To achieve high performance CQD/organic hybrid devices, controlling interfacial properties between CQD and organic matter is crucial. By carefully modulating the electronic band between CQD and polymer layers through inserting an interfacial layer treated with various ligands, local charge accumulation and bimolecular recombination can be suppressed, resulting in a high short-circuit current and fill factor of hybrid solar cells. The optimized CQD/polymer hybrid solar cell demonstrates high power conversion efficiency and stability.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Analytical
Doheon Yoo, Eunyoung Bak, Hae Mee Ju, Yoo Min Shin, Min-Jae Choi
Summary: Indium phosphide colloidal quantum dots have attracted great interest as next-generation light-emitting materials due to their narrow emission spectra and environmentally-friendly components. Researchers have successfully passivated the surface defects of InP core using zinc complexes, resulting in improved photoluminescence quantum yield and reduced full-width at half-maximum.
Article
Chemistry, Multidisciplinary
Changjo Kim, Irem Kozakci, Sang Yeon Lee, Byeongsu Kim, Junho Kim, Jihyung Lee, Boo Soo Ma, Eun Sung Oh, Taek-Soo Kim, Jung-Yong Lee
Summary: This study proposes a facile approach to improve the mechanical stability of CQD solar cells without compromising the high power conversion efficiency. By introducing (3-aminopropyl)triethoxysilane (APTS) on CQD films, the dot-to-dot bonding is strengthened, making the treated devices robust to mechanical stress. The device maintains 88% of the initial PCE under 12,000 cycles at a bending radius of 8.3 mm and achieves a PCE of 11.04%, one of the highest PCEs in flexible PbS CQD solar cells.
Article
Chemistry, Physical
Jonathan De Roo
Summary: This article provides a perspective from a nanochemist on the field of colloidal nanocrystals, with a specific focus on nanocrystal synthesis. It discusses the chemistry involved with precursors, ligands, and solvents, as well as different crystallization mechanisms. The article also addresses the need for standard reporting practices in the field and encourages researchers to consider chemical equations and reaction by-products.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
P. Tim Prins, Federico Montanarella, Kim Dumbgen, Yolanda Justo, Johanna C. van der Bok, Stijn O. M. Hinterding, Jaco J. Geuchies, Jorick Maes, Kim De Nolf, Sander Deelen, Hans Meijer, Thomas Zinn, Andrei Petukhov, Freddy T. Rabouw, Celso De Mello Donega, Daniel Vanmaekelbergh, Zeger Hens
Summary: Experimental evidence supports the principle of producing semiconductor nanocolloids with uniform size distributions through hot injection synthesis. The interaction between the nucleation period and reaction-limited size focusing results in narrow size dispersions.
Article
Chemistry, Physical
Mingxuan Cao, Min Wang, Zhiwen Wang, Luhao Zang, Hao Liu, Shuping Xiao, Matthew M. F. Yuen, Ying Wang, Yating Zhang, Jianquan Yao
Summary: An improvement in random lasers based on quantum dot/graphene-doped polymer was observed, with the factors of multiple light-scattering and graphene surface plasmon resonance attributed to it. The study compared the emission characteristics of quantum dots doped with graphene oxide and reduced graphene oxide, and found that the hybrid of quantum dots and reduced graphene oxide exhibited a lower laser emission threshold. The emission modes and thresholds were strongly influenced by both the graphene doping concentration and the external temperature.
Article
Nanoscience & Nanotechnology
Nikola Dordevic, Raphael Schwanninger, Maksym Yarema, Stefan Koepfli, Olesya Yarema, Yannick Salamin, Nolan Lassaline, Bojun Cheng, Nuri Yazdani, Alexander Dorodnyy, Yuriy Myronovych Fedoryshyn, Vanessa Wood, Juerg Leuthold
Summary: Efficient and engineered photodetectors using colloidal quantum dots and metasurface enhancement are reported. The photodetectors and photodiodes showed high responsivities and faster responses, thanks to the metasurface design. The metasurface improved the absorption and enabled photogain, resulting in high performance photoconductors and photodiodes.
Review
Chemistry, Multidisciplinary
Namyoung Ahn, Cleiment Livache, Valerio Pinchetti, Victor I. Klimov
Summary: Lasers and optical amplifiers based on solution-processable materials, including colloidal quantum dots, have been highly sought-after for their compatibility, scalability, and ease of integration. Recent advances in colloidal nanocrystal lasing devices have shown promising progress towards the development of viable devices.
Article
Chemistry, Physical
Ding -Yuan Kuo, Emily Nishiwaki, Ricardo A. Rivera-Maldonado, Brandi M. Cossairt
Article
Chemistry, Inorganic & Nuclear
Nayon Park, Ryan A. Beck, Kevin K. Hoang, Dylan M. Ladd, Jared E. Abramson, Ricardo A. Rivera-Maldonado, Hao A. Nguyen, Madison Monahan, Gerald T. Seidler, Michael F. Toney, Xiaosong Li, Brandi M. Cossairt
Summary: We demonstrate the colloidal, layer-by-layer growth of metal oxide shells on InP quantum dots (QDs) at room temperature. The presence of surface-localized dark states near the band edges due to native InP QD surface oxides gives rise to nonradiative pathways, which can be reduced by replacing surface indium with zinc to form a ZnO shell. A synthetic strategy using stoichiometric amounts of common atomic layer deposition precursors in alternating cycles was developed for layer-by-layer growth. The results show the potential of controlling QD interfaces and contribute to the understanding of the connections between structural complexity and PL properties in colloidal optoelectronic materials.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Thi Kieu Ngan Pham, Edward Bruffey, Anh Tuan Nguyen, Ricardo A. Rivera-Maldonado, Ding-Yuan Kuo, Brandi Cossairt, Woochul Lee, Godwin Severa, Joseph J. Brown
Summary: This study successfully synthesized and deposited MgB2 thin films on a gold surface using a wet-chemistry colloid synthesis and deposition process, circumventing the extreme conditions of conventional physical deposition methods. Gas adsorption experiments, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) characterization were conducted to validate the functionality and obtain meaningful data of the deposited MgB2 films. A similar synthesis method was applied on an evaporated Au film on glass, and the film thickness was measured to be 3.9 nm using scanning transmission electron microscopy (STEM). AFM roughness measurements confirmed the successful mitigation of the coffee-ring effect.
Article
Chemistry, Analytical
Jared E. Abramson, William M. Holden, Ricardo A. Rivera-Maldonado, Alexandra Velian, Brandi M. Cossairt, Gerald T. Seidler
Summary: The analytical chemistry of phosphorus-containing materials faces challenges such as long measurement times, large sample masses, limited availability of synchrotron beamlines for P K-edge analysis, species interconversion during liquid extraction, and air-sensitivity of phosphorus materials. To address these challenges, a new laboratory-based spectrometer is designed and operated to perform P K alpha and K beta X-ray emission spectroscopy (XES) in a controlled-atmosphere glovebox. Demonstration studies on nickel phosphide nanophases highlight the importance of air-free XES and simultaneous K alpha and K beta spectroscopy for understanding P oxidation state and nanoscale influences on electronic structures.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
