Article
Chemistry, Physical
Liwei Dai, Christian Strelow, Tobias Kipp, Alf Mews, Iris Benkenstein, Dirk Eifler, Thanh Huyen Vuong, Jabor Rabeah, James McGettrick, Rostyslav Lesyuk, Christian Klinke
Summary: This study presents the successful direct doping of Mn2+ ions into ZnS nanoplatelets using a nucleation-doping strategy, resulting in Mn luminescence in ZnS:Mn NPLs. Energy transfer from ZnS NPLs to Mn2+ ions was observed, and the impact of Mn concentration on optical properties was systematically investigated. Tunable Mn emission and enhanced PL quantum yield in ZnS:Mn NPLs were achieved by passivating surface trap states. The synthetic strategy introduced here opens up new possibilities for further doped systems of two-dimensional NPLs.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Kaiyue Peng, Eran Rabani
Summary: Controlling the relaxation dynamics of excitons in semiconductor nanocrystals is crucial for improving the efficiency of semiconductor applications. While confined nanocrystals offer additional control over exciton properties, such as size or shape, the actual relaxation process is weakly influenced by these factors due to increased exciton-phonon coupling and fast multiphonon relaxation channels. In this study, the nonradiative relaxation of excitons in nanocrystals placed in an optical cavity is investigated. The results demonstrate that carrier multiphonon emission dominates the decay process, leading to a significant slowdown in relaxation time scales compared to the cavity-free case, while the contribution of photons is secondary.
Article
Chemistry, Physical
Ruihua He, Abdullah Rasmita, Lei Zhou, Liangliang Liang, Xiangbin Cai, Jiaye Chen, Hongbing Cai, Weibo Gao, Xiaogang Liu
Summary: This research reports the observation of superradiance from mesoscopic CsPbBr3 perovskite emitters, which suggests their potential as low-cost quantum light sources.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jiabin Cui, Somnath Koley, Yossef E. Panfil, Adar Levi, Nir Waiskopf, Sergei Remennik, Meirav Oded, Uri Banin
Summary: By synthesizing the smallest bow-tie nanoantenna and verifying its functionality using single-particle spectroscopy, as well as the formation of an electric-field hotspot at the structure center as predicted by theory, this structure can enhance emission polarization and serve as a photochemical reaction center.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Yulian Han, Morihiko Hamada, I-Ya Chang, Kim Hyeon-Deuk, Yasuhiro Kobori, Yoichi Kobayashi
Summary: This study reports on the durable and temperature-independent T-type photochromism of colloidal Cu-doped ZnS nanocrystals. The color changes efficiently under UV light irradiation, with rapid decoloration in solutions. The research highlights the importance of excited carrier dynamics and trap depths for various advanced photofunctional materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Ho Jin, Clement Livache, Whi Dong Kim, Benjamin T. Diroll, Richard D. Schaller, Victor I. Klimov
Summary: The authors achieve a threefold enhancement in multiexciton yields in Mn-doped PbSe/CdSe quantum dots by exploiting spin-exchange interactions. These interactions outpace phonon emission losses and overcome the limitation of carrier multiplication. This study demonstrates the potential of spin-exchange carrier multiplication in advanced photoconversion.
Article
Materials Science, Multidisciplinary
Joonhyung Lim, Yun Chang Choi, Dongsun Choi, I-Ya Chang, Kim Hyeon-Deuk, Kwang Seob Jeong, Kyungwon Kwak, Minhaeng Cho
Summary: Investigating the separate dynamics of electrons and holes is crucial for understanding semiconducting nanomaterials. Recent studies on n-type self-doped colloidal quantum dots have revealed unprecedented ultrafast intraband Auger processes and electron relaxation between spin orbit coupling states in the conduction band, providing insights into electron dynamics in higher quantum states coupled to surface states of CQDs.
Article
Chemistry, Physical
Tom Galle, Daniel Spittel, Nelli Weiss, Volodymyr Shamraienko, Helena Decker, Maximilian Georgi, Rene Huebner, Nadia Metzkow, Christine Steinbach, Dana Schwarz, Vladimir Lesnyak, Alexander Eychmueller
Summary: The research transforms CdSe NPLs into PbSe NPLs suitable for optoelectronic applications through cation exchange, ligand exchange, and electronic coupling, successfully fabricating a photodetector with fast light response at low operational voltages on a commercial substrate.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Multidisciplinary Sciences
Menghan Liao, Yuying Zhu, Shuxu Hu, Ruidan Zhong, John Schneeloch, Genda Gu, Ding Zhang, Qi-Kun Xue
Summary: Understanding the rich and competing electronic orders in cuprate superconductors may provide important insight into the mechanism of high-temperature superconductivity. Here, the authors report a distinct charge order with Little-Parks like resistance oscillations at magnetic fields up to 10 T and around Tc in lightly doped Bi2Sr2CaCu2O8+x.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Junhong Yu, Sujuan Hu, Huayu Gao, Savas Delikanli, Baiquan Liu, Jacek J. Jasieniak, Manoj Sharma, Hilmi Volkan Demir
Summary: By investigating the emission properties, it has been observed that Cu-doped CQWs have efficient phonon cascade process and a giant Huang-Rhys factor, indicating an ultrastrong electron-phonon coupling. These findings challenge the widely accepted consensus and have important implications for optoelectronic applications of doped electronic nanomaterials.
Article
Optics
Xianghua Wang, Yong Yang, Xuedong Li, Wenbin Li, Juntao Hu, Wen-Hua Zhang
Summary: Inorganic cesium lead halide perovskite nanocrystals are synthesized using a modified hot injection method with in situ passivation of surface defects. The surface chemistry and lattice structure of the nanocrystals differ from those obtained through a postsynthesis exchange strategy. The emission wavelength and photoluminescence quantum yield of the nanocrystals can be tuned by adjusting the halide ratio, and the in situ passivation treatment shows promise for electroluminescence in light-emitting diodes.
Article
Chemistry, Multidisciplinary
Zheming Liu, Roberta Pascazio, Luca Goldoni, Daniela Maggioni, Dongxu Zhu, Yurii P. P. Ivanov, Giorgio Divitini, Jordi Llusar Camarelles, Houman Bahmani Jalali, Ivan Infante, Luca De Trizio, Liberato Manna
Summary: We successfully synthesized colloidal InAs nanocrystals (NCs) using amino-As and ligands different from the commonly employed oleylamine (OA). The combination of TOA and OA allowed for good control over the size distribution of the InAs NCs, with a volume ratio of 4:1 generating InAs tetrapods with arm lengths of 5-6 nm. These NCs are entirely zinc-blende and have a narrow excitonic peak at 950 nm in absorption. The use of mixtures of ligands improves control over the size and size distribution of InAs NCs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ajit Vikram, Ken Brudnak, Arwa Zahid, Moonsub Shim, Paul J. A. Kenis
Summary: Colloidal semiconductor nanocrystals with tunable optical and electronic properties offer exciting opportunities for various applications, but identifying optimal synthesis conditions and screening of recipes remain major challenges. An autonomous experimentation platform incorporating machine-learning and automated reactor can accelerate synthesis screening and optimization.
Article
Chemistry, Physical
Bruno Cury Camargo, Banan El-Kerdi, Andrei Alaferdov, Shahar Zuri, Magdalena Birowska, Walter Escoffier
Summary: We demonstrate that mechanical deformation of graphite through cavity shock waves can generate a new set of charge carriers, with significantly higher effective mass and native concentration compared to the pristine material. These carriers, however, still exhibit quasi-2D behavior. Our findings highlight the potential of defects introduced during mechanical exfoliation to induce oscillatory behavior above 50 T in graphite, offering a new avenue for studying field-induced electronic phase transitions in this material.
Review
Chemistry, Multidisciplinary
Ziyi Hu, Ryan O'Neill, Rostyslav Lesyuk, Christian Klinke
Summary: Due to spatial confinement, two-dimensional metal chalcogenides show extraordinary optical response and carrier transport ability. Colloidal chemistry developments allow the synthesis of various ultrathin colloidal nanoplatelets with specific properties. By altering experimental conditions and applying capping ligands, the dimensionality and optical properties of colloidal metal chalcogenide crystals can be accurately tuned for potential applications in photovoltaics, optoelectronics, and spintronics.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Chemistry, Physical
Alina M. Schimpf, Stefan T. Ochsenbein, Daniel R. Gamelin
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2015)
Article
Chemistry, Physical
Alma M. Schimpf, Jeffrey D. Rinehart, Stefan T. Ochsenbein, Daniel R. Gamelin
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2015)
Article
Chemistry, Multidisciplinary
Katie E. R. Marriott, Lakshmi Bhaskaran, Claire Wilson, Marisa Medarde, Stefan T. Ochsenbein, Stephen Hill, Mark Murrie
Article
Chemistry, Multidisciplinary
Ioannis Lignos, Viktoriia Morad, Yevhen Shynkarenko, Caterina Bernasconi, Richard M. Maceiczyk, Loredana Protesescu, Federica Bertolotti, Sudhir Kumar, Stefan T. Ochsenbein, Norberto Masciocchi, Antonietta Guagliardi, Chih-Jien Shih, Maryna I. Bodnarchuk, Andrew J. deMello, Maksym V. Kovalenko
Article
Chemistry, Physical
Christoph P. Guntlin, Stefan T. Ochsenbein, Michael Worle, Rolf Erni, Kostiantyn V. Kravchyk, Maksym V. Kovalenko
CHEMISTRY OF MATERIALS
(2018)
Article
Chemistry, Physical
Franziska Krieg, Stefan T. Ochsenbein, Sergii Yakunin, Stephanie ten Brinck, Philipp Aellen, Adrian Suess, Baptiste Clerc, Dominic Guggisberg, Olga Nazarenko, Yevhen Shynkarenko, Sudhir Kumar, Chih-Jen Shih, Ivan Infante, Maksym V. Kovalenko
ACS ENERGY LETTERS
(2018)
Article
Chemistry, Multidisciplinary
Alina M. Schimpf, Stefan T. Ochsenbein, Raffaella Buonsanti, Delia J. Milliron, Daniel R. Gamelin
CHEMICAL COMMUNICATIONS
(2012)
Article
Chemistry, Inorganic & Nuclear
Fraser J. Kettles, Victoria A. Milway, Floriana Tuna, Rafael Valiente, Lynne H. Thomas, Wolfgang Wernsdorfer, Stefan T. Ochsenbein, Mark Murrie
INORGANIC CHEMISTRY
(2014)
Article
Chemistry, Multidisciplinary
Cody W. Schlenker, Kung-Shih Chen, Hin-Lap Yip, Chang-Zhi Li, Liam R. Bradshaw, Stefan T. Ochsenbein, Feizhi Ding, Xiaosong S. Li, Daniel R. Gamelin, Alex K. -Y. Jen, David S. Ginger
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2012)
Article
Physics, Condensed Matter
Maxim Raskin, Torsten Stiehm, Alicia W. Cohn, Kelly M. Whitaker, Stefan T. Ochsenbein, Steffen Michaelis de Vasconcellos, Martin S. Brandt, Daniel R. Gamelin, Rudolf Bratschitsch
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2014)
Article
Materials Science, Multidisciplinary
Michael L. Baker, Oliver Waldmann, Stergios Piligkos, Roland Bircher, Olivier Cador, Stefano Carretta, David Collison, Felix Fernandez-Alonso, Eric J. L. McInnes, Hannu Mutka, Andrew Podlesnyak, Floriana Tuna, Stefan Ochsenbein, Roberta Sessoli, Andreas Sieber, Grigore A. Timco, Hogni Weihe, Hans U. Guedel, Richard E. P. Winpenny
Article
Chemistry, Multidisciplinary
Gabriele Raino, Annelies Landuyt, Franziska Krieg, Caterina Bernasconi, Stefan T. Ochsenbein, Dmitry N. Dirin, Maryna I. Bodnarchuk, Maksym V. Kovalenko
Article
Nanoscience & Nanotechnology
Stefan T. Ochsenbein, Franziska Krieg, Yevhen Shynkarenko, Gabriele Raino, Maksym V. Kovalenko
ACS APPLIED MATERIALS & INTERFACES
(2019)
Proceedings Paper
Physics, Multidisciplinary
M. Raskin, K. Whitaker, G. Kiliani, K. Beha, S. T. Ochsenbein, N. Janssen, T. Stiehm, M. Fonin, U. Ruediger, A. Leitenstorfer, D. R. Gamelin, R. Bratschitsch
XVIIITH INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA
(2013)