Article
Materials Science, Multidisciplinary
Shuo Zhang, Menglu Chen, Ge Mu, Jinmei Li, Qun Hao, Xin Tang
Summary: This paper demonstrates an efficient spray-stencil lithography technique for the scalable fabrication of multichannel HgTe CQD infrared detectors that can respond to different spectral ranges, producing uniform and smooth CQD films on various substrates. The fabricated CQD detectors exhibit high peak D* values in both short-wave and mid-wave regions, with infrared imaging capability down to a low noise equivalent temperature difference.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Arun Ashokan, Paul Mulvaney
Summary: Solution-phase spectroelectrochemistry was used to study electron injection into colloidal CdSe quantum dots in THF. The results showed reversible optical changes on a time-scale of minutes, with the injection of electrons leading to quenching of photoluminescence. The number of electrons injected into the QDs depended on the electrode potential and QD size, with most injection occurring below the band edge.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Cara E. Bradsher, Cayla D. Ontko, Alexandra C. Koziel, James R. McBride, Sandra J. Rosenthal
Summary: This research has found that ferroelectric behavior can be achieved in nanoparticles through ion exchange, with fluorescence retention achieved through CdS shelling before ion exchange, containing defects in the CdS shell rather than the fluorescent CdSe cores. The ferroelectric response remains constant with an increase in the number of CdS monolayers, while fluorescence retention also increases, reaching 99% at 8 monolayers, allowing for the addition of ferroelectric applications to the growing list of quantum dot applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Engineering, Environmental
Darwin Kurniawan, Michael Ryan Rahardja, Pavel V. Fedotov, Elena D. Obraztsova, Kostya (Ken) Ostrikov, Wei-Hung Chiang
Summary: In this study, lightweight and porous metal-graphene composites with embedded nitrogen-doped graphene quantum dots (NGQDs) and gold nanoparticles (AuNPs) were developed for water monitoring and purification. The composites exhibit reliable photoluminescence for heavy metal detection, high adsorption capacity, and fast catalytic degradation of organic pollutants. The scalable plasma process allows for the fabrication of large-area hierarchical composites with tunable porosity and self-healing ability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Optics
Jian Zhang, Shaohui Zhang, Yule Zhang, Omar A. Al-Hartomy, Swelm Wageh, Abdullah G. Al-Sehemi, Yabin Hao, Lingfeng Gao, Hao Wang, Han Zhang
Summary: This review provides a comprehensive evaluation of the optoelectronic application levels of semiconductor quantum dots (SQDs), perovskite quantum dots (PQDs), and carbon quantum dots (CDs), as well as a detailed summary of photocatalysis. The article discusses the compositions and optoelectronic properties of the three types of quantum dots, compares their strengths and weaknesses, demonstrates their flourishing development in various optoelectronic applications, and identifies bottlenecks and opportunities for future breakthroughs.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Bingxu Liu, Lihua Wang, Xiao Gong, Haiguang Zhao, Yuanming Zhang
Summary: In this study, high-quality carbon quantum dots were synthesized using a solvent-free heating method. These carbon quantum dots exhibited high stability, high quantum yield, and were suitable for use in luminescent solar concentrators. Laminated solar concentrators fabricated using these carbon quantum dots demonstrated high external optical efficiency, indicating the potential application of this method.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Review
Chemistry, Multidisciplinary
Qian Zhao, Rui Han, Ashley R. Marshall, Shuo Wang, Brian M. Wieliczka, Jian Ni, Jianjun Zhang, Jianyu Yuan, Joseph M. Luther, Abhijit Hazarika, Guo-Ran Li
Summary: Colloidally grown nanosized semiconductors, especially colloidal quantum dots (QDs), have great potential as optoelectronic materials. These materials show excellent properties in solar photovoltaics and display technology, with low cost and high performance. This article explores the possibilities of different deposition techniques to bring QD-based solar cells to an industrial level, and discusses the challenges faced by perovskite QD solar cells in achieving large-area fabrication.
ADVANCED MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Juliette Zito, Ivan Infante
Summary: Enhanced optoelectronic properties and processability of next-generation colloidal semiconductor nanocrystals can be achieved through rational engineering of the nanocrystals' surface characteristics, with the help of machine learning algorithms and atomistic calculations to control the process and anticipate experimental outcomes.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Physics, Multidisciplinary
Jordi Llusar, Juan I. Climente
Summary: Colloidal semiconductor nanoplatelets exhibit excellent optical emission properties due to their quasi-2D structures and strong in-plane Coulomb interactions. The charging of nanoplatelets with interacting fermions leads to severe Coulomb repulsions, resulting in strong electronic correlations and exchange energies. These phenomena give rise to characteristic physical effects such as deviating shell filling spectra, large addition energies for deterministic control of the number of charges, and activation of paramagnetic electron spin configuration at cryogenic temperatures.
PHYSICAL REVIEW LETTERS
(2022)
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, Multidisciplinary
Taewoo Ko, Samir Kumar, Sanghoon Shin, Dongmin Seo, Sungkyu Seo
Summary: In this study, a novel approach to pattern quantum dot (QD) nanopatterns by electron beam lithography was presented. Colloidal QDs were used without additional modifications, and reliable dot and line patterns with dimensions as small as 140 nm were successfully generated. Additionally, it was shown that using a SiO2 spacer layer on a Au substrate can significantly enhance the fluorescence intensity of QDs.
Article
Multidisciplinary Sciences
Xinyi Liang, Yuxuan Liu, Peilin Liu, Junrui Yang, Jing Liu, Yang Yang, Bo Wang, Jun Hu, Linxiang Zhang, Gaoyuan Yang, Shuaicheng Lu, Guijie Liang, Xinzheng Lan, Jianbing Zhang, Liang Gao, Jiang Tang
Summary: A fabrication strategy for large-area flexible CQD photodiodes was established by introducing polyimide to CQD ink to improve passivation, ink persistence, and film morphology. The resulting photodiodes showed reduced dark current density, improved homogeneity, and work stability. These photodiodes exhibited higher detectivity (D*) compared to other reported CQD photodetectors and can be used for wearable photoplethysmogram (PPG) signal measurement under ambient light at reduced cost and power consumption.
Article
Chemistry, Multidisciplinary
Runze Guo, Yufeng Liu, Yongzheng Fang, Zhifu Liu, Langping Dong, Lei Wang, Wenyao Li, Jingshan Hou
Summary: In this study, CsPbI3-mesoporous SiO2 nanocomposites were synthesized using microfluidic technology to improve the chemical and thermal stability of CsPbI3 PNCs, as well as greatly enhance water resistance. The results show a significant improvement in stability and water resistance properties, making it suitable for large-scale production of stable perovskite NCs.
Article
Chemistry, Physical
Aqiang Liu, Chenghao Bi, Xuanhui Qu, Jianjun Tian
Summary: The formation process of colloidal lead halide perovskite nanocrystals undergoes three stages, with the need for PbBr64- octahedrons to form first in order to react with Cs+ ions to create perovskite crystals.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Maral Vafaie, James Z. Fan, Amin Morteza Najarian, Olivier Ouellette, Laxmi Kishore Sagar, Koen Bertens, Bin Sun, F. Pelayo Garcia de Arquer, Edward H. Sargent
Summary: Efficient ligand exchange route enables large-diameter CQDs to achieve high-efficiency passivation and charge transport, leading to CQD solids with external quantum efficiency greater than 80% at 1,550 nm. This technology has the potential to replace conventional III-V semiconductors and make significant advancements in the field of infrared photodetection.
Article
Engineering, Mechanical
Sole Eo, Dohyung Kim, Jeong-Hyun Kim, Jinkee Lee
Summary: The macroscopic dynamic advancing and receding contact angles of an aqueous glycerin solution on lubricant-infused surfaces were measured. The dynamic advancing contact angles increased with increasing capillary number, while the dynamic receding contact angles decreased. The viscosity ratio between the working fluid and lubricant oil influenced the trends in the dynamic contact angles.
EXPERIMENTS IN FLUIDS
(2022)
Article
Nanoscience & Nanotechnology
Bora Kim, Moonhoe Kim, Hyojung Kim, Sohee Jeong, JungYup Yang, Mun Seok Jeong
Summary: Perovskite solar cells (PSCs) have short lifetimes, but by using transition metal dichalcogenide (TMD) interlayers, both efficiency and stability of the devices can be improved.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Ha-Chi V. Tran, Bora Kim, Hyojung Kim, Sungwook Park, Ju Young Woo, Sohee Jeong
Summary: This study demonstrates for the first time that triiodide ions hinder the anion-exchange activities in lead halide perovskite nanocrystals (LHP NCs) and result in the formation of LHP NCs with a low photoluminescence quantum yield. Heating the precursor solution can effectively minimize the concentration of triiodide and obtain high-efficiency anion-exchange LHP NCs with a high photoluminescence quantum yield.
CHEMISTRY OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Youngsang Park, Hyoin Kim, Daekwon Shin, Taewan Kim, Mahnmin Choi, Jugyoung Kim, Doh C. Lee, Sohee Jeong
Summary: Solution-processed nanomaterials have shown remarkable progress in photovoltaics in the past decade. AgBiS2 CQDs, as environmentally friendly alternatives to lead-containing materials, have attracted attention. However, these solar cells have performed poorly in charge carrier extraction compared to lead-containing devices. By introducing a QPB interlayer at the CQD/polymer interface, the power conversion efficiency and durability of AgBiS2 CQD solar cells can be significantly improved.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ritesh Prakash, Jinseok Lee, Youngkwang Moon, Diva Pradhan, Seung-Hyun Kim, Ho-Yong Lee, Jinkee Lee
Summary: This study investigates the effects of different surfactants and pH mediums on the formation, diameter, concentration, size distribution, zeta-potential, and stability of nanobubbles (NBs). The results show that the diameter, concentration, size distribution, and stability of NBs are strongly influenced by the zeta-potential rather than the solution medium. NBs have a longer lifespan in pure water, surfactant, and pH mediums, but a shorter lifespan in environments with a pH <= 3.
Review
Chemistry, Physical
Taewan Kim, Daekwon Shin, Meeree Kim, Hyoin Kim, Eunhye Cho, Mahnmin Choi, Jugyeong Kim, Eunji Jang, Sohee Jeong
Summary: Colloidal quantum dots, particularly group III-V CQDs, are being extensively researched due to their tunable energy band properties. Despite successful implementation in specific areas, such as light downconversion optoelectronics, most state-of-the-art group III-V CQD-based devices still suffer from low efficiency compared to other CQD-based devices. Efforts are being made to address challenges specific to efficient group III-V CQD-based optoelectronics design and fabrication, with a focus on synthesis, surface modification, and effective carrier modulation.
ACS ENERGY LETTERS
(2022)
Review
Chemistry, Multidisciplinary
Meeree Kim, Mahnmin Choi, Sinil Choi, Sohee Jeong
Summary: Developing next-generation colloidal semiconductor nanocrystals with high-quality optoelectronic properties and precise processability relies on achieving complete mastery over the surface characteristics of nanocrystals. Recent progress has been made by combining well-defined surface models with quantitative surface reactions, enabling a better understanding and manipulation of nanocrystal surface chemistry. This research presents a compelling case for utilizing facet-specific chemistry as a platform for mechanistic investigation and morphology exploration, which can pave the way for developing high-quality and precisely designed nanocrystals for optoelectronic technologies.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Chemistry, Physical
Mahnmin Choi, Meeree Kim, Yeunhee Lee, Taewan Kim, Jun Hyung Kim, Daekwon Shin, Jeong Won Kim, Yong-Hyun Kim, Sohee Jeong
Summary: The tunable band edge position of nonconductive colloidal quantum dot films is investigated using photo-electron spectroscopy and density functional theory calculations. The results show that the energy levels of nonconducting CQD films can be controlled by partially replacing the surface-bound ligand, providing a method for efficient optoelectronic device design.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Instruments & Instrumentation
Seongsu Cho, Jihyeong Lee, Sun Cheol Park, Hoon Suk Park, Dae Hee Lee, Jinkee Lee
Summary: A pulsatile flow generator was developed to mimic blood flow, providing cost effectiveness and user convenience. The device achieved blood flow in the superior and inferior vena cava with a 3.3% error using iterative learning control. The study also measured the recirculation ratios based on different insertion directions and external pipe materials to assess the catheter's performance under different conditions.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Chemistry, Multidisciplinary
Sunghu Kim, Seongmin Park, Meeree Kim, Sohee Jeong
Summary: Single-crystalline indium phosphide (InP) tetrapods were synthesized and proved to be a useful platform for studying multiple exciton behaviors. ZnCl2 precursor was used to enhance the optical performance of InP tetrapods, but no distinct enhancement in photoluminescence was observed. However, further shell growth on InP-ZnCl2 successfully preserved tetrapodal geometry and showed higher photoluminescence than tetrapodal InP/ZnSe. The crystal structure of InP-ZnCl2 was retained even with various Zn feed ratios.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Chaeyeon Lim, Mahnmin Choi, Taewan Kim, Daekwon Shin, Jung Hoon Song, Sohee Jeong
Summary: The electrical properties of solar cells fabricated with bandgap-tuned lead sulfide (PbS) quantum dots (QDs) were analyzed in this study. It was found that reducing the thickness of the QD active layer is necessary for achieving high power conversion efficiency, mainly due to the increasing doping concentration of the QD film as the QD bandgap decreases. It is suggested that the electrical characteristics of QD photovoltaic devices should be taken into consideration when designing their structures in relation to the bandgap.
MATERIALS TODAY ENERGY
(2023)
Article
Engineering, Chemical
Saebom Lee, Jihyeong Lee, Minki Lee, Hyejeong Kim, Gyoujin Cho, Jinkee Lee
Summary: This study numerically investigated the mixing performance of a rotating channel based on the Coriolis force with herringbone grooves. Mixing was maximized when the Coriolis force was appropriately balanced with the centrifugal force. The addition of herringbone grooves improved mixing, achieving up to >90% for the shortest channel length.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Chemistry, Physical
Jumi Park, Eunhye Cho, Kyoungwon Park, Sohee Jeong, Dongho Kim
Summary: This study investigates the influence of electrochemical doping on the optical properties of single-crystalline InP nanotetrapods. The photoluminescence (PL) intensity of these tetrapods undergoes significant changes depending on the nature of charge transfer during electrochemical doping. Electron transfer leads to a decrease in the PL intensity, while injection of additional holes results in a remarkable increase in PL intensity. The injected holes occupy surface hole trap states, enhancing surface passivation and thus improving PL intensity. These findings highlight the potential of InP nanotetrapods as a novel nanostructure for nanocrystal applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jusun Park, Seohee Park, Seongwoo Cho, Youngsik Kim, Hyojung Kim, Sohee Jeong, Ju Young Woo
Summary: The instability of cesium lead halide perovskite nanocrystals (CsPbX3 NCs) has hindered the realization of high performance devices. In this study, we developed a post-synthetic strategy to modify the surface of CsPbX3 NCs, enhancing their stability and preventing merging under air conditions.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Weon-kyu Koh, Soo Ho Choi, Youngsik Kim, Hyojung Kim, Ki Kang Kim, Sohee Jeong
Summary: The sulfide vapor process enhances air stability on the surface of colloidal indium arsenide quantum dots, while also improving the n-type charge transport electron mobility of the corresponding QD films, and demonstrating gate bias-dependent recombination of photo-generated carriers in near-infrared photoconductivity.
ADVANCED PHOTONICS RESEARCH
(2022)