Article
Multidisciplinary Sciences
Yuki Tsuruma, Emi Kawashima, Yoshikazu Nagasaki, Takashi Sekiya, Gaku Imamura, Genki Yoshikawa
Summary: The report introduces next-generation PDs based on thin films of amorphous oxide semiconductors with performance surpassing the silicon limit. This breakthrough was achieved by creating an ideal Schottky interface at the interface, resulting in low specific on-resistance and high breakdown voltage. The technology allows successful fabrication of prototypes on flexible polyimide films, which are not compatible with the fabrication process of bulk single-crystal devices.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Liqun Liu, Chang Cai, Zejian Zhang, Shitong Zhang, Jian Deng, Bing Yang, Cheng Gu, Yuguang Ma
Summary: The organic lamellar single crystal reported serves as a versatile optoelectronic material with low threshold energy and high quantum efficiency, showing extraordinary device performance in optical pumping and light-emitting transistors.
ACS MATERIALS LETTERS
(2021)
Article
Chemistry, Physical
Fangjuan Geng, Yu-Ning Wu, Daniel Splith, Liangjun Wang, Xiaowan Kang, Xiaojian Chen, Pengsheng Guo, Shanshan Liang, Lei Yang, Michael Lorenz, Marius Grundmann, Jiaqi Zhu, Chang Yang
Summary: By developing an amorphous Cu(S,I) material system, record high hole conductivities of 10(3)-10(4) S cm(-1) have been achieved in p-type amorphous transparent conductors (a-TCs), making them comparable with commercial n-type TCs made of indium tin oxide and 100 times greater than any previously reported p-type a-TCs. The high hole conduction is due to the overlap of large p-orbitals of I- and S2- anions, providing a hole transport pathway insensitive to structural disorder. Additionally, the bandgap of amorphous Cu(S,I) can be modulated from 2.6 to 2.9 eV by increasing the iodine content. These unique properties demonstrate the great potential of the Cu(S,I) system as a promising p-type amorphous transparent electrode material for optoelectronics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Materials Science, Multidisciplinary
Yue Wang, Sisi Jia, Zhitao Zhang
Summary: Organic optoelectronic devices have become increasingly attractive due to their potential applications in sensing, energy conversion, optical imaging, and optogenetic therapy. However, traditional devices based on brittle indium tin oxide electrodes are not suitable for highly stretchable optoelectronics. To overcome this challenge, novel electrodes with excellent stretchability, such as PEDOT and PEDOT:PSS, have been investigated. This review discusses various patterning strategies for fabricating high-resolution PEDOT and PEDOT:PSS thin-film electrode arrays, as well as modification methods to enhance their conductivity and stretchability.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
S. G. Ruvalcaba-Manzo, S. J. Castillo, M. Flores-Acosta, R. Ochoa-Landin, R. Ramirez-Bon
Summary: This study investigates the properties of CdO thin films obtained by thermal annealing of CdCO3 thin films. The results show that the obtained CdO thin films have suitable structural and optical properties for optoelectronic applications.
Article
Chemistry, Physical
Zhongguo Li, Zhendong Wu, Xiaolong Wang, Hongtao Cao, Lingyan Liang, Junyi Yang, Yinglin Song
Summary: The study demonstrates the fabrication of amorphous zinc tin oxide thin films with strong visible light absorption using rf magnetron sputtering and rapid postannealing. The ultrafast carrier dynamics of the ternary films were investigated using femtosecond transient absorption spectroscopy, revealing that visible light absorption is induced by band gap reduction rather than defect states in the ZTO film. These findings shed light on the photophysical mechanism of amorphous ZTO films and suggest their potential use in solar cell and photodetector devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Review
Chemistry, Multidisciplinary
Zhongkai Cheng, Deirdre M. O'Carroll
Summary: Photon recycling is crucial in the study of semiconductor materials, impacting their optoelectronic applications; however, further in-depth theoretical and experimental studies are needed to demonstrate its advantages and importance rigorously.
Article
Materials Science, Multidisciplinary
Yu Gan, Yongda Huang, Naihua Miao, Jian Zhou, Zhimei Sun
Summary: A group of 56 novel layered semiconducting IV-V-VI compounds with ultralow lattice thermal conductivity have been predicted through high-throughput ab initio calculations. These compounds exhibit intrinsically low lattice thermal conductivity at room temperature, attributed to avoided-crossing behavior between optical phonons and acoustic modes, leading to significant reduction of phonon group velocities and inducing strong anharmonic phonon-phonon scattering. This work provides a new family of semiconductors with exceptionally low lattice thermal conductivity and emphasizes the design of new low-kappa(l) materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Multidisciplinary Sciences
Yifan Yao, Yusheng Chen, Kuidong Wang, Nicholas Turetta, Stefania Vitale, Bin Han, Hanlin Wang, Lei Zhang, Paolo Samori
Summary: A foldable inverted polymer light-emitting diode (iPLED) based on a self-suspended asymmetrical vertical nanoscaffold is reported, exhibiting excellent mechanical robustness and high brightness. Arbitrary emitting patterns can be generated using photolithography and brush painting, with individual pixel resolution of 10 μm. The iPLED can be supported on flexible polyimide foils and recycled by washing and refilling with different conjugated polymers capable of emitting light of different color.
Article
Materials Science, Multidisciplinary
Rui Wang, Ralf Moos
Summary: A new method has been developed for measuring the electrical conductivity of semiconductor specimens, especially ceramics at high temperatures, without the need for accurate electrode preparation. The method involves processing an image of the specimen to a 3D model, calculating a form factor with finite element simulation, and deriving the actual conductivity using measured resistance. Experimental results have validated the method within a certain range of conductivity.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Ceramics
Marian Kubisztal
Summary: High-entropy ceramic oxide with the spinel structure and chemical composition Mn0.62(2)Fe0.62 (2)Ni0.60(3)Co0.58(2)Zn0.58(3)O4 was prepared using co-precipitation technique and low-temperature sintering process. The electrical conductivity variation in the temperature range of 120 K to 400 K was analyzed using theoretical models. It was found that the material exhibited a high temperature coefficient of resistance and a significant magnetoresistance coefficient.
CERAMICS INTERNATIONAL
(2023)
Article
Thermodynamics
K. Strzalkowski
Summary: The review discusses the thermal properties of selected II-VI binary, ternary, and quaternary semiconductors, including thermal diffusivity, heat capacity, and thermal conductivity. An analysis of thermal conductivity versus composition diagrams of ternary mixed crystals was conducted, revealing the contribution of lattice disorder to the total resistivity of the crystals. The use of different detection methods and modification of experimental systems were highlighted to adapt the photopyroelectric method for the thermal characterization of II-VI crystals.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Nanoscience & Nanotechnology
Frank Angeles, Samreen Khan, Victor H. H. Ortiz, Mingfei Xu, Shisong Luo, Dinusha Herath Mudiyanselage, Houqiang Fu, Yuji Zhao, Richard B. B. Wilson
Summary: The thermal conductivity of wide bandgap semiconductor thin films has a significant impact on the performance of various devices. However, accurately measuring the thermal conductivity of sub-micrometer thin films with high values is difficult. This study proposes a combination of magneto-optic thermometry and TiN interfacial layers to enhance the spatiotemporal resolution of pump/probe thermal transport measurements.
Article
Materials Science, Ceramics
Biswajyoti Mohanty, J. Nayak
Summary: The band gap energy of CeO2 nanostructures limits their efficiency in visible light harvesting, but forming a heterojunction with narrow band gap semiconductors such as CdS can reduce the optical band gap and effectively separate photogenerated charge carriers. CeO2/CdS nanocomposite thin films were successfully deposited on FTO glass substrates, showing improved carrier lifetime, reduced non-radiative recombination, and enhanced electrical conductivity. These improvements in CeO2/CdS films may lead to enhanced charge transportation ability, making them suitable for photovoltaic applications as demonstrated by significant values of J(sc) and V-oc obtained from photoelectrochemical solar cell measurements.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Chun Sum Brian Pang, Wessley Ng, Jing Liang, Qing Qu, Ho Tin Martin Chau, Muyao Niu, Man Kit Cheng, Iam Keong Sou
Summary: This article presents a simple and low-cost experimental setup for measuring the thermoelectric effect of thin film materials near room temperature to determine their conductivity types. By using Bi2Te3 and Sb2Te3 thin films as tested samples, the study confirmed their conductivity types through Seebeck coefficients and characterized a heterostructure through electrical transport measurements. The heterostructure's physical parameters were extracted, leading to the confirmation of a p-n junction based on its rectifying current-voltage behavior, reflecting the contrast in the conductivity types of Sb2Te3 and Bi2Te3.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
