Article
Materials Science, Multidisciplinary
M. Thirumoorthi, S. Shek Dhavud, V. Ganesh, T. H. Al Abdulaal, I. S. Yahia, D. Deivatamil
Summary: In this study, a n-ZnO/p-CuO heterojunction thin film was prepared using the low-cost SILAR method, and a comparative analysis was conducted with ZnO and CuO thin film photodetectors. The prepared heterojunction film exhibited a mixture of hexagonal structure of ZnO and monoclinic structure of CuO, with uniform surface morphology. The optical absorption spectrum showed high photon absorption in the range of 2-6% at 365 nm UV light. The photoluminescence spectrum indicated the presence of different types of point defects in the heterojunction film. The photo sensing results demonstrated that the ZnO/CuO heterojunction film exhibited good photodiode characteristics.
Article
Materials Science, Multidisciplinary
Takaya Kawagishi, Yusuke Adachi, Taizo Kobayashi
Summary: This study investigates the impact of different crystallographic structures of sputter-deposited TiO2 n-type window layers on the power conversion of TiO2/Se photovoltaic devices. The efficient photovoltaic conversion of TiO2/Se devices requires improving carrier collection in the Se layer and reducing recombination at the TiO2/Se interface. TiO2 window layers with varying anatase and rutile crystallographic structures were applied to TiO2/Se heterojunction devices. The power conversion efficiency of TiO2/Se photovoltaic devices was increased from 3.04% to 4.48% in devices with anatase/rutile mixture window layer.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Luanhong Sun, Wei Wang, Lingyun Hao, Zhichao Jia, Yijie Zhao, Guowei Zhi, Hanyu Yao
Summary: Synthesizing Cu2CdxZn1-xSn(S,Se)(4) (CCZTSSe) absorber through selenizing Cd2+ treated CZTS precursor significantly increases the grain size from nano to micron level, leading to enhanced device performance. The improved heterojunction characteristic with CdS buffer layer in CCZTSSe prevents carrier recombination caused by interface state defects, resulting in an optimized device efficiency of 4.38% for x = 0.07.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Physics, Applied
Qiyan Zhang, Mitsuhiro Honda, Yo Ichikawa
Summary: ZnS/ZnO nanocomposites were fabricated by a simple coating method, exhibiting higher photocatalytic activity due to the separation and transfer of photoexcited carriers at the contact. Additionally, thermal pre-treatment on ZnO thin films improved crystallinity and enhanced photocatalysis by extending the lifetime of the photoexcited carriers.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Ying Wang, Cheuk Kai Gary Kwok, Dezhi Xiao, Jiuzhou Zhu, Xingyu Shu, Chao Ping Liu, Kin Man Yu
Summary: Cu2O can exhibit enhanced p-type conductivity through Ni doping, and rapid thermal annealing leads to significant improvement in the crystallinity and conductivity of the alloy films.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Hadjer Hakkoum, Abderrahim Moumen, Mebrouk Ghougali, Nouredine Sengouga, Elisabetta Comini
Summary: Material properties are crucial for the efficiency and performance of optoelectronic devices like photodetectors, and we focused on fabricating a NiO/ZnO heterojunction with improved structural properties. By varying the spray solution volume, we investigated the influence of NiO and ZnO thickness on the structural and morphological properties using spray pyrolysis. Thicker NiO and ZnO films were found to be optimal for fabricating the desired heterostructure. Raman and XRD results confirmed the formation of the NiO/ZnO heterostructure, which exhibited smooth morphology without any pinholes. Further simulations allowed for studying the impact of structural properties on the photodetector performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Analytical
Victor V. Petrov, Victor V. Sysoev, Irina O. Ignatieva, Irina A. Gulyaeva, Maria G. Volkova, Alexandra P. Ivanishcheva, Soslan A. Khubezhov, Yuri N. Varzarev, Ekaterina M. Bayan
Summary: Thin nanocomposite films of Co3O4-ZnO were synthesized by solid-phase pyrolysis. The films show a wurtzite phase of ZnO and a spinel structure of Co3O4. Increasing annealing temperature and Co3O4 concentration result in larger crystallite sizes. The optical properties and charge carrier mobility of the films are influenced by the Co3O4 content. Photosensors based on the films exhibit enhanced photoresponse in specific wavelength ranges.
Article
Energy & Fuels
Santu Mazumder, Kasilingam Senthilkumar
Summary: This study simulated and optimized various factors in CZTS solar cells, including layer thickness, defects, and front contact transmission profile. The introduction of CuI as a hole transport layer was found to have advantages, and a high acceptor type defect density in CZTS was found to increase the open-circuit voltage. The finally optimized cell achieved a power conversion efficiency of 15.53%.
Article
Materials Science, Multidisciplinary
Yuhan Nie, Yadong Xie, Ying Zheng, Yao Luo, Jianguo Zhang, Zao Yi, Fusheng Zheng, Li Liu, Xifang Chen, Pinggen Cai, Pinghui Wu
Summary: This study successfully coated ZnO nanoarrays with Bi2O3 using magnetron sputtering to achieve a composite heterojunction structure with excellent photoelectric conversion performance. By preparing the ZnO/Bi2O3 composite heterostructure, the material's absorption of visible light was effectively enhanced and carrier recombination within the material was inhibited.
Article
Chemistry, Physical
Sagar B. Jathar, Sachin R. Rondiya, Yogesh A. Jadhav, Dhanaraj S. Nilegave, Russell W. Cross, Sunil Barma, Mamta P. Nasane, Shankar A. Gaware, Bharat R. Bade, Sandesh R. Jadkar, Adinath M. Funde, Nelson Y. Dzade
Summary: Ternary Cu2SnS3 (CTS) is an attractive non-toxic absorber material with suitable optoelectronic properties. High-quality CTS nanoparticles (NPs) were successfully synthesized using a low-cost hot injection route. The CTS photocathode shows excellent photoelectrochemical properties, and CdS is a better photoanode material to form a heterojunction with CTS for enhanced PEC activity.
CHEMISTRY OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Cihat Bozkaplan, Yusuf Selim Ocak, Kemal Akkilic
Summary: ZnS thin films were deposited on soda-lime glass and p-Si substrates using radio frequency sputtering, exhibiting (111) and (200) orientations of the ZnS structure with an average particle size of 44.00 +/- 0.56 nm. The optical band gap of the thin films was calculated as 3.7 eV. The electrical and photoelectrical properties of the Ag/ZnS/ p-Si heterojunction were analyzed, showing a barrier height of 0.694 eV and a series resistance of 449 ohms. The photodiode performance was evaluated using a solar simulator with AM1.5 global filter, and the barrier height values obtained from C-V measurements were consistent with the I-V method.
Article
Materials Science, Multidisciplinary
A. Jesu Jebathew, M. Karunakaran, Mohd Shkir, H. Algarni, S. AlFaify, Aslam Khan, Najla Alotaibi, Thamraa Alshahrani
Summary: ZnS and samarium-doped ZnS thin films were prepared for photo-detector applications using Nebulizer Spray Pyrolysis technique, and their structural, morphological, optical, and photo-detecting behaviors were characterized. The 0.5% Sm-doped ZnS thin film exhibited the lowest optical band gap and the highest Responsivity, EQE, and Detectivity values, indicating the significant influence of samarium doping on the photo conducting mechanism of ZnS.
Article
Engineering, Chemical
Reda M. Mohamed, Ibraheem A. Mkhalid, Maha Alhaddad, Amal Basaleh, Khalid A. Alzahrani, Adel A. Ismail
Summary: The study focused on converting CO2 into methanol through a photochemical method, and achieved promising results with the synthesized Pt/ZnS@ZnO heterostructure, which exhibited high activity and stability.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Analytical
Lianyun Cheng, Yanwei Li, Guohua Cao, Guang Sun, Jianliang Cao, Yan Wang
Summary: A sensitization strategy was proposed to improve the gas sensing performance of ZnO by constructing ZnS-ZnO n-n heterojunction. The gas sensing tests indicated that after modification with ZnS-ZnO heterojunctions, the gas sensing performances of the ZnO PHS sensor were remarkably improved, especially in terms of response speed, sensitivity, and selectivity.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Victor V. Petrov, Irina O. Ignatieva, Maria G. Volkova, Irina A. Gulyaeva, Ilya V. Pankov, Ekaterina M. Bayan
Summary: Transparent Al-doped ZnO films were synthesized by solid-phase pyrolysis and characterized by XRD, SEM, and TEM. The films exhibit wurtzite structure and have a uniform distribution of nanoparticles. The introduction of 1% Al results in a narrowed band gap and improved response time to radiation.
Article
Materials Science, Multidisciplinary
Ping Zhang, Xiujie Yue, Yeran Gao, Zhenyong Lin, Shunxiang Wang, Songting Zhang
Summary: This paper investigates the strengthening mechanism of highspeed cutting and solid particle-entrained waterjet peening (HSC-WJP) composite reinforcement on 7075-T6 aluminum alloy. The research results show that composite reinforcement can improve surface quality, reduce surface pits and roughness, and decrease the size of precipitation-free zone (PFZ) at grain boundaries.
Article
Materials Science, Multidisciplinary
Sangyoon Lee, Hwi Yoon, Sanghun Lee, Seung-min Chung, Hyungjun Kim
Summary: The wettability of metal oxides, particularly HfO2 thin films deposited via atomic layer deposition, and its correlation with surface free energy have been studied. It was found that surface oxygen species significantly affect the intrinsic hydrophilicity of HfO2 thin films, and the crystalline orientations also evolve with film thickness.
Article
Materials Science, Multidisciplinary
Changdong Yin, Yiwen Wu, Zhou Xu, Dongdong Ye, Jun Yao, Jianjun Chen, Qiang Liu, Xin Ge, Meiling Ding
Summary: This study proposed a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results showed that the hydrogen permeation curve obtained was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the specimens increased with increasing stress.
Article
Materials Science, Multidisciplinary
Huan Luo, Wei-yi Wang, Xin Yu, Xian-jun Lei, Lang Liu, Guo-zheng Zha, Wen-long Jiang, Bin Yang, Bao-qiang Xu
Summary: Separating selenium and tellurium is a general challenge in material and non-ferrous metallurgical industries. This paper proposes a novel method that achieved efficient separation of selenium and tellurium using gas-liquid equilibrium phase diagram and valence regulation-vacuum gasification technique.
Article
Materials Science, Multidisciplinary
Fan Zhang, Rong Xin Wang, Aiqin Tian, Fangzhi Li, Jianping Liu, Hui Yang
Summary: Deposition of Pd/Pt/Au three-layer films on p-GaN under high and ultra-high vacuum conditions was studied to investigate the electrical contact properties. Linear I-V curves were observed in samples deposited under ultra-high vacuum conditions, while nonlinear I-V characteristics were obtained in samples deposited under high vacuum conditions. The study also found that the samples deposited under high vacuum conditions had higher amounts of oxygen and Pd oxide. The oxide layer had an additional influence on the electrical characteristics of the Pd/Pt/Au/p-GaN contact.
Article
Materials Science, Multidisciplinary
Hongli Liu, Chengzhe Liu, Ying Sui, Zhongxian Liu, Tiangang Zhang, Zhiqiang Zhang, Shuang Sun, Jianwei Jia
Summary: This study utilized polysiloxane and hafnium carbide to produce Si-N-C-O-Hf hybridized ceramic fibers, and obtained ceramic fibers with hemispherical particles on the surface through electrostatic spinning and pyrolysis. The ceramic fibers exhibited excellent thermal stability, oxidation resistance, and high temperature insulation.
Article
Materials Science, Multidisciplinary
M. Abaker, Nazar Elamin Ahmed, A. Saad, H. F. Khalil, E. M. M. Ibrahim, A. M. Adam
Summary: This paper systematically studied the internal structure and thermoelectric properties of In1-xGaxSb alloys prepared by melting synthesis at 1123 K. The results showed that doping with Ga in the In sites led to a significant increase in the Seebeck coefficient and power factor, while reducing the thermal conductivity. The maximum dimensionless figure of merit was observed at 403 K.
Article
Materials Science, Multidisciplinary
Fucheng Yu, Jinlong Ren, Jielin Zhang, Haiyang Chen, Xin Tian, Chenchen Feng, Cuixia Li, Jianbin Zhang, Xianxi Tang, Xiaogang Hou
Summary: An environmentally friendly ZnO@BiVO4 composite photocatalyst was prepared using in-situ self-assembly and solvothermal methods, demonstrating good photocatalytic performance. The mass ratio of BiVO4 and NCZ was found to influence the photocatalytic performance of the composite.
Article
Materials Science, Multidisciplinary
Yaoming Shao, Pingping Zheng, Tianhao Dong, Lianghuan Wei, Haifei Wu, Jianxiao Si
Summary: In this paper, Mg3Bi2 films were prepared on glass substrate using magnetron sputtering, and the phase composition and thermoelectric properties of the films were investigated with different atomic ratios. The films displayed a metastable cubic phase and high conductivity when the atomic ratio exceeded stoichiometry.
Article
Materials Science, Multidisciplinary
I. V. Uimanov, D. L. Shmelev, S. A. Barengolts
Summary: A two-dimensional axisymmetric model has been developed to study the prebreakdown processes in a cathode microprotrusion under an external electric field. The simulation results show that electrohydrodynamic instability leads to the formation of a nanometer-sized conical protrusion on the microprotrusion tip, significantly accelerating the heating process.
Article
Materials Science, Multidisciplinary
Weilun Zhang, Di Yang, Feng Gong, Yongjun Chen, Tian Chen, Zhiwen Xie, Sirui Yang
Summary: A novel Pt doping method was designed to improve the thermal stability of CrWN coating. The doping of Pt atoms effectively blocks the coherent growth of the grains and creates a significant mixing effect, resulting in a smooth surface with uniform element distribution.
Article
Materials Science, Multidisciplinary
Xiaoye Wang, Xiaoguang Yang, Wenna Du, Tao Yang
Summary: In this study, the effects of multiple growth parameters on self-catalyzed growth of InAs/GaSb axial heterostructured nanowires on Si substrate by MOCVD were investigated. It was found that the growth temperature and switching time have significant influences on the nanowire growth.
Article
Materials Science, Multidisciplinary
Weizhong Cui, Yan Zhao, Can Cui, Xing Liu, Beili Pang, Jianguang Feng, Hongzhou Dong, Liyan Yu, Lifeng Dong
Summary: This study introduces Co2+ cations into Cs2AgBiBr6 film to improve its quality, grain size, and conductivity, resulting in enhanced solar cell efficiency.
Article
Materials Science, Multidisciplinary
Jian Wang, Ke Yang, Xianming Cheng, Yalin Lu, Ganghui Wu, Yang Zhang, Yun Kan
Summary: The corrosion behavior and microstructural evolution of Sc microalloyed Al-3.2Cu-1.5Li alloys were investigated in detail. The microstructural results showed higher levels of dislocations density in the Sc microalloyed sample, which resulted in significantly refined grains and T1 precipitates. Microalloying with Sc changed the corrosion mode of the alloy and localized corrosion was found to occur preferentially at the subgrain within unrecrystallized grains with high grain stored energy.
Article
Materials Science, Multidisciplinary
Weifeng Liu, Na Liu, Kaiqiang Song, Meiqin Zeng, Zhongchen Lu
Summary: Monoclinic WO3 prepared through plasma milling exhibits higher photocatalytic activity due to its higher surface area, increased oxygen vacancies, and defects.