Article
Chemistry, Multidisciplinary
Stefan W. Tabernig, Lin Yuan, Andrea Cordaro, Zhi Li Teh, Yijun Gao, Robert J. Patterson, Andreas Pusch, Shujuan Huang, Albert Polman
Summary: We have designed an optically resonant bulk heterojunction solar cell to study the optoelectronic properties of nanostructured p-n junctions. By optimizing the nanoscale pattern, we were able to improve the efficiency of the solar cell by enhancing the absorption and charge-carrier extraction behavior. Our experiments and simulations showed significant improvement in infrared response and current gain in the patterned solar cell compared to the planar reference, demonstrating the importance of nanostructured geometries in enhancing solar cell performance.
Article
Materials Science, Multidisciplinary
Lei Wang, Ping Mu, Zixiang Zhou, Xin Zhang, Dezheng Liu, Ying Liang, Guijie Liang
Summary: In this study, a series of CdSe quantum dot-molecule complexes were assembled to investigate the triplet energy transfer process. The experimental results showed that the size of the quantum dots affects the rate of hole and electron transfer, but the transfer process is mainly determined by the energy level difference and wavefunction overlap.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Taek Joon Kim, Sang-hun Lee, Eunji Lee, Changwon Seo, Jeongyong Kim, Jinsoo Joo
Summary: In this study, the energy band alignments of a heterostructure consisting of MAPbI(3) perovskite sheets and CdSe-ZnS core-shell quantum dot layers were modulated, leading to the emission of far-red interlayer excitons. These excitons exhibited a longer lifetime and strong dipole alignment at the heterojunction. An abnormal behavior of the optical characteristics near the phase transition temperature of MAPbI(3) was observed. Photodetectors based on MAPbI(3)/CdSe-ZnS-QD heterostructures showed increased photocurrent and detectivity compared to MAPbI(3) under interlayer exciton excitation.
Article
Chemistry, Multidisciplinary
Tao Li, Bin Li, Haoxiang Zhou, Jun Wang, Gang Ni, Wanli Ma, Chuanxiang Sheng, Jianyu Yuan, Haibin Zhao
Summary: This study reports on the ultrafast dynamics of charge transfer and exciton dissociation in single-material organic solar cells for the first time. It is found that the intramolecular interface in the block copolymer has a higher transfer rate, and the dilute PBDB-T-b-PTY6 film has faster exciton dissociation. By optimizing ordering, the power conversion efficiency of organic solar cells can be improved.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Anju Elsa Tom, Ajith Thomas, Ajeesh Kumar Somakumar, Libin Kuriakose, V. V. Ison
Summary: A hybrid solid-state ligand exchange strategy was developed using inorganic ligand TBAI and organic ligand EDT, which resulted in improved performance of QDs films. The method integrates the benefits of both ligands and resolves the incomplete solid-state ligand exchange, leading to enhanced power conversion efficiency.
Article
Chemistry, Physical
Miguel Albaladejo-Siguan, David Becker-Koch, Elizabeth C. Baird, Yvonne J. Hofstetter, Ben P. Carwithen, Anton Kirch, Sebastian Reineke, Artem A. Bakulin, Fabian Paulus, Yana Vaynzof
Summary: Light-harvesting devices made from lead sulfide quantum dot absorbers have promising applications in third-generation photovoltaics. Passivating the quantum dot surfaces and managing the excess lead halide can improve device performance and stability.
ADVANCED ENERGY MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yuanyuan Zhou, Miao Li, Shuaishuai Shen, Jing Wang, Rui Zheng, Hao Lu, Yahui Liu, Zaifei Ma, Jinsheng Song, Zhishan Bo
Summary: The rapid development of fused-ring electron acceptors has made them a potential substitute to fullerene-based acceptors in organic solar cells, while nonfused-ring acceptors can significantly reduce synthetic cost and achieve reasonable power conversion efficiencies.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Nataliia Sukharevska, Dmytro Bederak, Vincent M. Goossens, Jamo Momand, Herman Duim, Dmitry N. Dirin, Maksym Kovalenko, Bart J. Kooi, Maria A. Loi
Summary: The recent advancement in phase transfer ligand exchange methods has improved the performance of PbS quantum dots solar cells and simplified film deposition complexity. By using highly stable PbS QD inks, efficient solar cells have been successfully fabricated.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Zhiyong Liu, Hong-En Wang
Summary: A ternary heterojunction strategy using PBDB-T-2F, IT-4F, and NC(70)BA as donor, acceptor, and third component, respectively, leads to improved photovoltaic performance in polymer solar cells. The introduction of NC(70)BA optimizes light absorption and exciton dissociation, resulting in a highest power conversion efficiency of 13.90% in an optimized ratio. This ternary strategy shows promise for developing highly efficient ternary PSCs.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yamei Zhou, Christos S. Garoufalis, Sotirios Baskoutas, Zaiping Zeng, Yu Jia
Summary: In this study, charge transfer excitons were activated by twisting in heterodimer and homodimer quantum dot molecules, breaking the constraint of band alignment. The importance of twisting for charge separation and exciton generation was demonstrated, providing a new pathway for manipulating the properties of QD materials and related molecular systems.
Article
Chemistry, Physical
Xing Meng, Yifan Chen, Fan Yang, Jieqi Zhang, Guozheng Shi, Yannan Zhang, Haodong Tang, Wei Chen, Yang Liu, Lin Yuan, Shaojuan Li, Kai Wang, Qi Chen, Zeke Liu, Wanli Ma
Summary: This study explores the potential of using conjugated polymers as hole-transporting layer (HTL) in lead sulfide (PbS) quantum dot solar cells. The precise regulation of the inorganic/organic interface is crucial for achieving high-performance devices. By introducing CsPbl(3) quantum dots as an interfacial layer between the PbS quantum dot active layer and the organic polymer HTL, the interface is mediated and favorable energy level alignment is achieved, resulting in improved charge extraction and reduced interfacial charge recombination. As a result, the photovoltaic performance is efficiently improved from 10.50% to 12.32%. This study may provide new guidelines for the device structural design of quantum dot optoelectronics by integrating different solution-processed semiconductors.
Article
Chemistry, Physical
Han Zhang, Hong-En Wang, Ting Zhu, Zhiyong Liu, Lan Chen
Summary: In this study, high-performance and thermally stable organic solar cells were achieved by using two blended polymers as donors and one acceptor. The optimized ternary films showed improved power conversion efficiency and thermal stability, attributed to the energy level matching and high crystallization of the photoactive layer.
ACS APPLIED ENERGY MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Muhammad Abdul Basit, Muhammad Aanish Ali, Zunair Masroor, Zeeshan Tariq, Jin Ho Bang
Summary: Quantum dot-sensitized solar cells (QDSSCs) have unique characteristics that make them a promising solution to the energy-economy-environment dilemma. Researchers have been strategically addressing the challenges faced by QDSSCs, such as back transfer of electrons, recombination, and photocorrosion, to improve their performance. Interfacial layers (ILs) have proved beneficial in addressing these challenges, providing surface passivation, seeding quantum dots, and controlling back electron transfer. This review discusses the multifunctional roles of ILs in QDSSCs, characterization techniques, and future prospects.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Matthew W. Brett, Liselotte C. Nass, Calum K. Gordon, Lara D. Browne, Bridget L. Stocker, Michael B. Price, Mattie S. M. Timmer, Nathaniel J. L. K. Davis
Summary: Photon multiplication is a promising approach for surpassing the theoretical limit of single-junction photovoltaic cells. This study focuses on singlet fission-based photon multipliers using tetracene chromophores and lead sulfide quantum dots. By controlling the design and synthesis of novel tetracene chromophores and the shelling of the quantum dots, significant improvements in photoluminescence efficiencies have been achieved. However, the wavelength dependence of the improved photoluminescence efficiency cannot be solely attributed to singlet fission.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Mu Xiao, Yalong Jiao, Bin Luo, Songcan Wang, Peng Chen, Miaoqiang Lyu, Aijun Du, Lianzhou Wang
Summary: Coupling graphitic carbon nitride (CN) with carbonaceous materials enhances photocatalytic performance by improving exciton dissociation and charge transfer. The enhanced light absorption from carbon has little contribution to H-2 evolution activity.
Article
Nanoscience & Nanotechnology
Sangyeon Pak, Jiwon Son, Taehun Kim, Jungmoon Lim, John Hong, Younhee Lim, Chul-Joon Heo, Kyung-Bae Park, Yong Wang Jin, Kyung-Ho Park, Yuljae Cho, SeungNam Cha
Summary: A novel iodine gas doping method has been proposed to simultaneously modulate the electrical properties of both 2D MoS2 channel and 2D CuS electrode in a facile and cost-effective manner, allowing for the improvement of the control performance of electronic devices.
Article
Chemistry, Physical
Ziyu Guo, Zhenyu Wang, Jinbo Liu, Yaxing Sun, Liu Yang, Jiangtao Feng, Bo Hou, Wei Yan
Summary: Efficient removal of mercury ions from water is crucial for ecosystem protection and public health. This study enhances the effectiveness of functional groups in removing mercury by modifying and adjusting the molecular structure of poly(pyrrole ethene). The functionalized poly(pyrrole methane)s show high uptake capacities for mercury and exhibit advantages such as low usage, selectivity for mercury ions, and resistance to interference from coexisting ions. The study suggests a potential strategy for developing adsorbents to remove mercury and other heavy metal ions from aqueous solutions for environmental remediation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
Han Byeol Lee, Young-Hee Joo, Harshada Patil, Gwan-Ha Kim, Insu Kang, Bo Hou, Deok-kee Kim, Doo-Seung Um, Chang-Il Kim
Summary: Due to its high dielectric constant, BaTiO3 (BTO) thin film shows potential in next-generation MOSFETs as a dielectric material. Thus, it is essential to evaluate the etching process of BTO thin film for nanoscale device applications. This study investigates the etching characteristics and surface properties based on the crystallinity of BTO thin film. The results indicate that high-crystallinity thin film has a lower etching rate and surface residues compared to low-crystallinity thin film. Additionally, Cl radicals in the plasma penetrate more easily into low-crystallinity thin film than high-crystallinity thin film, resulting in higher surface roughness after etching.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Jihong Kim, Sung Min Wi, Jong-Guk Ahn, Sangjun Son, HeeYoung Lim, Yeonsu Park, Hye Ji Eun, Jong Bae Park, Hyunseob Lim, Sangyeon Pak, A-Rang Jang, Young-Woo Lee
Summary: Researchers have demonstrated significant improvement in the electrochemical performance of flexible, in-plane micro-supercapacitors using a sharp-edged interdigitated electrode design fabricated through direct laser scribing method. The sharp-edged electrodes induce a strong electric field at the corners of the electrode fingers, leading to greater ion accumulation near the electrode surface and significantly enhancing the energy storage performance of micro-supercapacitors.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Energy & Fuels
Seunghwan Jo, Sangyeon Pak, Young-Woo Lee, SeungNam Cha, John Hong, Jung Inn Sohn
Summary: Increasing anion vacancies can greatly improve the electrochemical energy storage performance of perovskite materials, where the vacancies serve as favorable paths for ion diffusion. However, the energy storage mechanism at binary cation sites under anion deficiency in supercapacitor electrode materials needs further exploration.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Physical
Sangyeon Pak, Seungje Kim, Jungmoon Lim, Taehun Kim, Kyung-Ho Park, SeungNam Cha
Summary: Chemical vapor deposition (CVD) synthesis of two-dimensional (2D) transition-metal dichalcogenides (TMDCs) at high temperature (>700 degrees C) limits their growth substrates and applications. This study presents a direct CVD synthesis of 2D MoS2 on glass at a reduced temperature of 500 degrees C using carbothermal reduction. The MoS2 grown on glass exhibits comparable properties to those grown at high temperatures, demonstrating a promising strategy for the growth of 2D materials and the design of flexible and transparent devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Bo Hou, Felix Cosmin Mocanu, Yuljae Cho, Jongchul Lim, Jiangtao Feng, Jingchao Zhang, John Hong, Sangyeon Pak, Jong Bae Park, Young-Woo Lee, Juwon Lee, Byung-Sung Kim, Stephen M. Morris, Jung Inn Sohn, SeungNam Cha, Jong Min Kim
Summary: Computational simulations and electron microscopy in this study reveal that nanofaceting can occur during nanocrystal synthesis, leading to curved interfaces and olivelike-shaped nanoparticles.
Editorial Material
Chemistry, Multidisciplinary
Sangyeon Pak, Jung-Inn Sohn
Article
Chemistry, Inorganic & Nuclear
Akbar I. Inamdar, Amol S. Salunke, Bo Hou, Nabeen K. Shrestha, Hyunsik Im, Hyungsang Kim
Summary: Operating temperatures significantly affect the energy storage mechanism of Li-ion battery anodes. In this study, a new anode material, copper-iron-tin-sulphide (CFTS), was fabricated and its performance in Li-ion batteries was investigated at temperatures ranging from 10°C to 55°C. The CFTS anode showed a discharge capacity of 283.1 mA h g(-1) at room temperature, stabilizing at 174.0 mA h g(-1) in repeated cycles. The discharge capacity decreased at lower temperatures and increased at higher temperatures. Electrothermal impedance spectroscopy revealed the rate of chemical reactions and change in internal resistance at different temperatures. The CFTS anode exhibited excellent cycling stability, with capacity retention of 146% and coulombic efficiency over 80%.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Fensha Cai, Yufei Tu, Dadi Tian, Yan Fang, Bo Hou, Muhammad Ishaq, Xiaohong Jiang, Meng Li, Shujie Wang, Zuliang Du
Summary: ZnO nanoparticles with low defect density and high environmental stability were successfully synthesized using ethylenediaminetetraacetic acid dipotassium salt (EDTAK) as an additive. Bifunctional engineering strategy alleviated electron over-injection and promoted charge balance by elevating the conduction band level of ZnO. This resulted in state-of-the-art blue quantum-dot light-emitting diodes with an EQE of 16.31% and a T-50@100 cd/m² of 1685 hours, providing a novel and effective method to fabricate blue QLEDs with high efficiency and a long operating lifetime.
Proceedings Paper
Computer Science, Cybernetics
SeongHyeon Jo, Youngjo Song, Yechan Lee, Si-Hwan Heo, Sang Jin Jang, Yusung Kim, Joon-Ho Shin, Jaesung Jeong, Hyung-Soon Park
Summary: This study investigated the brain activity pattern during hand rehabilitation exercise using fMRI and compared it before and after 3-week hand rehabilitation robot training. The results suggest that hand rehabilitation robot therapy can induce different brain activity patterns in stroke survivors, which may be linked to patient-specific training outcomes.
2023 INTERNATIONAL CONFERENCE ON REHABILITATION ROBOTICS, ICORR
(2023)
Article
Chemistry, Physical
Ji-Yeop Kim, Mi-Jin Jin, Bo Hou, Minsoo P. Kim, Doo-Seung Um, Chang-Il Kim
Summary: This study investigates the improvement of perovskite thin films through O2 plasma treatment, and explores the possibility of enhancing device properties. The findings contribute to the advancement of STO thin films in flexible electronic devices and display components, and provide insights into the role of oxygen vacancies and the effectiveness of OPT in reducing their number.
APPLIED SURFACE SCIENCE
(2023)
