Article
Materials Science, Multidisciplinary
Xiaowen Zhou, Yu Zhao, Wenzhe Huang, Yuanyuan Wu, Zhongen Wu, Gufeng He
Summary: Zn doping into CsPbBr3 NCs significantly enhances the performance of PeLED, leading to an 85% increase in PLQY, higher luminance, and a maximum EQE of 0.85%. The balanced carrier transport achieved through optimized energy level alignment with Zn doping contributes to the improved efficiencies in the devices.
ORGANIC ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Tassilo Naujoks, Roshini Jayabalan, Christopher Kirsch, Fengshuo Zu, Mukunda Mandal, Jan Wahl, Martin Waibel, Andreas Opitz, Norbert Koch, Denis Andrienko, Marcus Scheele, Wolfgang Bruetting
Summary: Surface-defect passivation is crucial for achieving high photo-luminescence quantum yield in lead halide perovskite nanocrystals. In addition, treatment with LiTFSI as a halide-free surface passivation on perovskite nanocrystals can lead to improved efficiency, longer exciton lifetime, and a more favorable radiation pattern for light outcoupling in LED devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Yuyu Zhang, Jia Sun, Yuqi Wang, Ralf Riedel, Qiangang Fu
Summary: By modifying polysilazane with divinylbenzene, dopamine hydrochloride, and melamine, different types of carbon nanomaterials (C-free, graphene, and N-containing graphene) were in situ generated in single-source-precursors-derived SiCN ceramics, leading to differences in phase structure and electromagnetic wave absorption (EMA) properties of SiCN/C ceramics. In situ C-free enhances the EMA capacity of SiCN ceramics by improving their electrical conductivity. The electrical conductivity of SiCN ceramics with 2D graphene sheets causes poor impedance match, resulting in a worse EMA performance. In situ NG in SiCN ceramics has a low electrical conductivity, making for excellent impedance match. The corrugated NG boosts dielectric loss, interfacial, and dipole polarization. NG-SiCN nanocomposites possess an outstanding EMA performance with lower RLmin and higher effective absorption bandwidth compared to SiCN.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yingying Chen, Zhennan Wu, Xiaojuan Liang, Ding Nan, Wen Xu, Weidong Xiang
Summary: In this study, a series of CsPbCl2Br1 nanocrystal glasses with excellent optical properties were prepared, and Sm3+ was introduced to enhance the photoluminescence emissions, ultraviolet response, and device stability of silicon photodetectors (Si PDs). The UV response of Si PDs was significantly enhanced after integrating the Sm3+-doped CsPbCl2Br1 nanocrystal glass (PNG) with Si PDs, reaching a responsivity 7.5 times that of bare Si PDs at 320 nm. Moreover, a broadband response from ultraviolet to infrared was achieved by integrating 10% Sm3+-doped CsPbCl2Br1 PNG with InGaAs PDs. This study offers new perspectives for next-generation high-performance UV photodetectors.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Chengyuan Tang, Xinyu Shen, Xiufeng Wu, Yuan Zhong, Junhua Hu, Min Lu, Zhennan Wu, Yu Zhang, William W. Yu, Xue Bai
Summary: In this study, the impact of cobalt doping into zinc oxide on LED performance was investigated, showing improvements in maximum luminance and external quantum efficiency. These enhancements lead to significant improvements in LED efficiency and performance.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Hangtao Ye, Qin Wang, Ziyao He, Yao Tong, Wei Xia, Hongbin Fan, Weidong Xiang, Xiaojuan Liang
Summary: In recent years, silicon photodetectors have been widely used but have low response in the ultraviolet region. This study successfully fabricated perovskite nanocrystal glasses with high transmittance and improved detection performance in the UV region. By adjusting the concentration of CsPbCl2Br1 nanocrystals and introducing Tb3+ ions, energy transfer was achieved and the photoluminescence quantum yield was significantly boosted. Integrating the fabricated perovskite nanocrystal glasses with silicon photodetectors enhanced their UV response and maintained excellent photocurrent stability. These perovskite nanocrystal glasses are expected to be optimal semiconductor materials for next-generation high-performance UV photodetectors.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Muhammad Amin Padhiar, Minqiang Wang, Yongqiang Ji, Zhi Yang, Yun Zhou, Hengwei Qiu, Hao Wang, Azaz Ali Shah, Arshad Saleem Bhatti
Summary: Perovskite nanocrystals (PNCs) with adjustable emission bands and high photoluminescence are ideal for optical devices. This study introduces a simple strategy to enhance the stability of blue-light emitting PNCs, achieving highly stable PNCs with changes in bandgaps and PLQY values. The doped PNCs show potential for use as color converters in liquid crystal displays (LCDs) and demonstrate remarkable stability under various ambient conditions.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yu-Hsuan Hsu, Yi-Hsin Lin, Ming-Hsien Wu, Hao Chung Kuo, Ray-Hua Horng
Summary: The current confinement effect on micro-LEDs (mu LEDs) with different p-contact sizes was investigated. Narrow contact sizes led to higher operating temperatures and heat generation, while larger contact sizes decreased turn-on voltage and increased leakage current. The best performance was achieved with a contact ratio of 0.5, resulting in the highest external quantum efficiency.
Article
Chemistry, Multidisciplinary
Jiangshan Feng, Yuxiao Jiao, Hui Wang, Xuejie Zhu, Youming Sun, Minyong Du, Yuexian Cao, Dong Yang, Shengzhong (Frank) Liu
Summary: An efficient vacuum deposition approach for perovskite solar cells has been developed, enabling the fabrication of high-quality films on glass and flexible substrates. The optimization of in-vacuum annealing temperature can significantly improve the efficiency of PSCs to 21.32%, the highest value achieved through vacuum deposition, with excellent long-term stability in a solvent-free and air-free environment.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Energy & Fuels
Alexander Eberst, Andreas Lambertz, Weiyuan Duan, Vladimir Smirnov, Uwe Rau, Kaining Ding
Summary: Due to its high transparency, silicon carbide can replace amorphous silicon as a front contact material in crystalline silicon solar cells. The doping in nc-SiC:H with different deposition techniques and the influence of various deposition conditions on the electrical conductivity and optical bandgap of hot wire chemical vapor deposition-prepared nc-SiC:H are investigated. The layer thicknesses of the two different nc-SiC:H layers applied in solar cells have different impacts on cell performance, with the passivating nc-SiC:H layer showing a trade-off between passivation and fill factor.
Article
Materials Science, Ceramics
Rahul Anand, Bibhuti B. Nayak, Shantanu K. Behera
Summary: The study showed that pyrolyzed SiTiCNO ceramic hybrids exhibited an amorphous state in nitrogen atmosphere, with a uniform distribution of anatase TiO2 nanocrystals throughout the SiCN matrix. SiCN-TiO2 nanocomposites demonstrated enhanced oxidation resistance at high temperatures, promising applications in high temperature barrier coatings and structural components.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Jinhyeon Kang, Jae Taek Oh, Hyeokjun Kim, Hanjae Kim, Hyosung Choi, In Hwan Jung
Summary: This study reports the development of high-performance AgBiS2 nanocrystal-based quantum-dot photodetectors (QPDs) with improved photodetection ability. A novel conjugated polyelectrolyte (CPE) was incorporated as a cathode buffer layer (CBL) to enhance the photocurrent density and reduce the dark current density.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Yin-Wei Cheng, Chun-Hung Chen, Shih-An Wang, Yi-Chang Li, Bo-Liang Peng, Jun-Han Huang, Chuan-Pu Liu
Summary: This study investigates the effects of boron and arsenic doping on the performance of silicon thin film anode materials in lithium-ion batteries. The results show that boron and arsenic can respectively deteriorate and enhance the capacity retention and rate capabilities of the pristine materials.
Article
Physics, Applied
Eymana Maria, Ajanta Saha, M. Ryyan Khan, Md. Abdullah Zubair, Md. Zunaid Baten, Redwan N. Sajjad
Summary: This paper discusses the potential of CuIn1-xGaxSe2 thin-film photovoltaic technology for semi-transparent photovoltaics, analyzing the carrier transport physics and the impact of thickness on impedance.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Jonas Kern, Johannes Heitmann, Matthias Mueller
Summary: This study investigates the impact of doping densities and electron affinity on the power conversion efficiency of perovskite/silicon tandem solar cells.
ACS APPLIED ENERGY MATERIALS
(2023)
