Article
Chemistry, Physical
Haoyu Chai, Hui Li, Fei Zhong, Zhen Xu, Shengqiang Bai, Lidong Chen
Summary: The choice of solvent for film preparation has a significant impact on the film morphology, doping level, and charge transport behavior, and thus affects the electrical conductivity. Crystallinity plays a key role in charge transport properties.
Article
Engineering, Electrical & Electronic
Haoyu Chai, Zhen Xu, Hui Li, Fei Zhong, Shengqiang Bai, Lidong Chen
Summary: Polymer semiconductors can benefit from chemical doping, but this often disrupts the molecular packing. In this study, a sequential-twice-doping (STD) approach is proposed to avoid this issue and maximize doping efficiency. The results show that the STD approach can optimize polymer crystallinity and achieve high electrical conductivity.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Junseong Song, Eilho Jung, Byeong Wook Cho, Bumsub Song, Jae Woo Kim, Hyeonbeom Kim, Ki Kang Kim, Byoungchul Son, Jouhahn Lee, Jungseek Hwang, Young Hee Lee
Summary: This study demonstrates that Cu substitution in the Ni site (Ta2Ni1-xCuxSe5) can achieve invariant excitonic insulating states in Ta2NiSe5, and the carrier type of the sample is converted by electron doping. The excitonic transition temperature (T-c) does not significantly change with electron doping concentrations, which is in stark contrast to the declining T-c as the hole-type dopant of Fe or Co increases. Optical conductivity data also confirms the invariant excitonic-insulating states in Cu-doped Ta2NiSe5. These findings provide possibilities for further electronic device applications using excitons.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Maria Vicent-Morales, Maria Esteve-Rochina, Joaquin Calbo, Enrique Orti, Inigo J. Vitorica-Yrezabal, Guillermo Minguez Espallargas
Summary: In this study, the use of tetrathiavulvalene-tetrabenzoic acid in porous hydrogen-bonded organic frameworks to induce semiconductivity is reported. By adjusting the synthetic conditions, three different polymorphs were obtained, and efficient charge transport was observed in two of them, demonstrating the semiconductor nature of these organic frameworks.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
A. Yatsenko, V. F. Shulgin, M. N. Palatnikov, N. Sidorov, O. Makarova
Summary: In a series of lithium niobate crystals, it was found that the mobility of Li+ ions sharply increases as the crystal approaches stoichiometric composition, especially along the polar direction. Additionally, doping lithium niobate crystals with under-threshold concentrations of non-photorefractive Mg and Zn substantially decreases the mobility of H+ ions.
SOLID STATE IONICS
(2021)
Article
Chemistry, Multidisciplinary
Tariq Aqeel, Heather F. Greer
Summary: We have successfully synthesized fluordoped crystalline mesoporous tin dioxide powder at ambient pressure and temperature. This material exhibits high surface area, narrow pore size distribution, small average crystallite sizes, and good opto-electrical properties. The addition of fluorine increases the opto-electronic activity of tin dioxide by 20 times and conductivity by 100 times compared to pristine tin dioxide.
Article
Chemistry, Multidisciplinary
Sining Wang, Linlin Zhang, Tao Hong, Lizhong Su, Yi Wen, Bingchao Qin, Yu Xiao, Yuping Wang, Haonan Shi, Junqing Zheng, Yuting Qiu, Li-Dong Zhao
Summary: The introduction of Bi2SbSe3 with high carrier concentration and mobility into the BiSbSe3 matrix through in situ reaction and conventional mechanical mixing improves the electrical conductivity and thermoelectric performance.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Chunchun Song, Yilin Song, Lin Pan, Changchun Chen, Pengan Zong, Yifeng Wang
Summary: Ti-doping with the shear exfoliation-restacking process was used to improve the thermoelectric properties of Bi2O2Se, leading to higher electrical conductivity and lower thermal conductivity. This resulted in an increased ZT value of 0.56 for Bi1.99Ti0.01O2Se.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Aamir Mahmood, Asghari Maqsood, Afaq Khaliq, Muhammad Nawaz
Summary: This study investigates the synthesis, structure, magnetic interactions, and electrical transport properties of different copper-doped zinc ferrite nanoparticles. The synthesized nanoparticles exhibit a cubic spinel structure, and the lattice parameters decrease with increasing Cu content. The nanoparticles emit green light in the visible spectrum. Cu+2 doping results in the highest saturation magnetization, and the electrical conductivity increases with temperature and Cu content. These nanoparticles show potential for various applications including sensors, energy storage, and catalysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Xing Yang, Wen-Hao Gu, Wen-Jie Li, Yi-Xin Zhang, Jing Feng, Zhen-Hua Ge
Summary: Polycrystalline SnSe thermoelectric materials have attracted much attention due to their low thermal conductivity and desirable mechanical properties, but their low electrical conductivity limits their application. By introducing Hf and Cl substitution, more electrons were released, resulting in a high electrical conductivity of 33 S cm-1 for the SnSe0.95+1 wt%HfCl4 sample, about 5 times higher than that of SnSe0.95 sample. The lattice thermal conductivity was suppressed due to the enhanced phonon scattering caused by the decrease of grain size, leading to a low thermal conductivity of 0.33 W m-1 K-1 for the SnSe0.95+4 wt%HfCl4 sample. As a result, a peak ZT value of -1.1 was achieved for the SnSe0.95+3 wt%HfCl4 sample at 773 K.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Pooja Sindhu, K. S. Ananthram, Anil Jain, Kartick Tarafder, Nirmalya Ballav
Summary: Downsizing materials into hetero-structured thin film configurations is important for capturing various interfacial phenomena. In this study, we fabricated a hetero-structured thin film of a Mott MOF and a band insulating MOF and observed metallic conduction at the interface.
NATURE COMMUNICATIONS
(2022)
Article
Energy & Fuels
Surassa Sriwichai, Rowshanak Irani, Fanxing Xi, Dennis Friedrich, Christian Hoehn, Ibbi Y. Ahmet, Natda Wetchakun, Fatwa F. Abdi
Summary: The study demonstrates that Gd3+ as a dopant can significantly increase the photocurrent of BiVO4 photoanodes by enhancing carrier separation for performance optimization.
Article
Physics, Applied
Marten Koopmansa, L. Jan Anton Kosterb
Summary: Doping has a significant impact on the Seebeck coefficient in organic semiconductors, with high carrier-carrier interactions reducing the Seebeck coefficient. Reducing these interactions can lead to an increased Seebeck coefficient and power factor, potentially increasing the ZT value above 1 for organic thermoelectrics.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Kui Feng, Junwei Wang, Sang Young Jeong, Wanli Yang, Jianfeng Li, Han Young Woo, Xugang Guo
Summary: This study reports on polymers based on fused bithiophene imide dimers, which incorporate different oligo(ethylene glycol) side chains to optimize electrical conductivity. The polymer PO12, with a moderate side-chain size, exhibits the highest electrical conductivity and power factor in organic thermoelectric devices. The results demonstrate the potential of side chain tuning for improving organic thermoelectric performance.
Article
Materials Science, Multidisciplinary
Jun Guo, Yu-Ke Zhu, Lin Chen, Zi-Yuan Wang, Zhen-Hua Ge, Jing Feng
Summary: In this study, Bi2S3 with high electrical transport properties was synthesized via Se and Cl co-doping. The significantly improved electrical conductivity and power factor of the material make it a promising candidate for thermoelectric applications at medium temperatures, with a high ZT value and conversion efficiency.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
