Article
Materials Science, Multidisciplinary
Islam Mohammad Shafiqul, Raj Deep, Jie Lin, Toshiyuki Yoshida, Yasuhisa Fujita
Summary: This article presents the world's first homojunction UV light-emitting diode (LED) based on both p-type and n-type ZnO nanoparticles. By inserting an n-ZnO NP layer, the emission power of these LEDs is doubled, showing near UV electroluminescence (EL) at room temperature.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Md. Azizar Rahman, S. M. Naimul Mamun, Abul Kashem Mohammad Akther Hossain, Cuong Ton-That
Summary: In this work, an efficient p-n homojunction LED is fabricated based on the secondary growth of Ga-doped ZnO (GZO) nanorods onto a p-type Li-doped ZnO (LZO) thin film. The optimized GZO nanorods and LZO films exhibit low turn-on voltage and bright-yellow-orange electroluminescence. The optimized LED based on the GZO nanorods is 16 times more efficient in EL than the equivalent device made from ZnO nanorods.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Ceramics
Anu Katiyar, Nishant Kumar, R. K. Shukla, Anchal Srivastava
Summary: This study synthesized undoped, doped, and co-doped vertically aligned zinc oxide nanorods (NRs) using a sonicated sol-gel immersion method and investigated the structural, morphological, optical, and photoconductivity properties of NRs with different dopants. The results showed that the incorporation of Fe improved the growth of NRs, while the incorporation of Ag had a detrimental effect. Co-doping enhanced the light harvesting efficiency and reduced the persistent photoconductivity.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Islam Mohammad Shafiqul, Raj Deep, Jie Lin, Toshiyuki Yoshida, Yasuhisa Fujita
Summary: In this study, nitrogen-doped zinc oxide nanoparticles were successfully synthesized using the gas evaporation method with DC arc plasma. The nitrogen concentration was found to have an impact on the Raman spectra and photoluminescence spectra of the nanoparticles.
Article
Engineering, Electrical & Electronic
X. A. Cao, N. Liu, D. Shelhammer, H. J. Wang, Y. M. Zhou
Summary: MoO3 and Ca were incorporated into ambipolar 4,4'-N, N'-dicarbazolylbiphenyl (CBP) to improve both charge transport and injection in single-carrier devices. The p-i-n homojunction blue OLEDs based on this structure showed higher luminance, efficiency, and lifetime compared to traditional multilayer heterojunction blue OLEDs, benefiting from the simplified structure and stable inorganic dopants.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Chemistry, Physical
Kyunghan Ahn, Ga Hye Kim, Se-Jun Kim, Jihyun Kim, Gi-Seong Ryu, Paul Lee, Byungki Ryu, Jung Young Cho, Yong-Hoon Kim, Joohoon Kang, Hyungjun Kim, Yong-Young Noh, Myung-Gil Kim
Summary: This study reports the synthesis of highly conductive transparent p-type sulfur-doped CuI (CuI:S) thin film using a liquid-iodination method with a thiol additive. The CuI:S film exhibits a remarkably high electrical conductivity and optical transmittance, achieving a record-high figure of merit (FOM) value. The CuI:S electrode is successfully utilized in transparent electronic devices.
CHEMISTRY OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Maosheng Liu, Mingming Jiang, Qinzhi Zhao, Kai Tang, Shulin Sha, Binghui Li, Caixia Kan, Da Ning Shi
Summary: Through a single MW field-effect transistor, we successfully synthesized Sb-doped p-type ZnO microwires and achieved an optical microcavity with a regular hexagonal cross-section and smooth sidewall facets, enabling whispering-gallery-mode lasing. By combining p-ZnO:Sb MW with an n-ZnO layer, we constructed a single ZnO:Sb MW homojunction LED which exhibited typical UV emission. Spatially resolved electroluminescence spectra demonstrated strong exciton-photon coupling in the p-ZnO:Sb MW/n-ZnO homojunction LED, contributing to the exciton-polariton effect. Varying the cross-sectional dimensions of ZnO:Sb wires further modulated the exciton-photon coupling strengths. These results provide an effective exemplification of reliable p-type ZnO and greatly promote the development of low-dimensional ZnO homojunction optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Multidisciplinary Sciences
S. Aboulhadeed, M. Ghali, M. M. Ayad
Summary: This article introduces a homojunction p-n diode device based solely on PEDOT:PSS thin films, which exhibits nonlinear I-V behavior.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
Simran Arora, Subhabrata Dhar
Summary: The electroluminescence properties of n(+)-ZnO/p-GaN pn(+)-heterojunctions grown epitaxially have been investigated as a function of applied bias and temperature. The study reveals the presence of indirect interfacial excitons at lower temperatures. The electroluminescence feature associated with these excitons is redshifted with increasing forward bias. The formation of these excitons becomes unsustainable when the applied bias or temperature exceeds a threshold due to leakage and thermal escape of charges.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Sulaiman S. A. Al Ghafry, Hamood Al Shidhani, Basim Al Farsi, R. G. Sumesh Sofin, Abdullah S. Al-Hosni, Zahra Alsharji, Jamal Al-Sabahi, Mohammed Z. Al-Abri
Summary: The contamination of water resources is a major environmental concern, especially the presence of hazardous pollutants such as phenol. Therefore, developing cost-effective techniques to remove phenol from water is crucial. This study investigated the use of silver-doped zinc oxide nanorods (Ag-ZnO NRs) for the degradation of phenol under sunlight. The synthesized Ag-ZnO NRs exhibited two distinct structures, hexagonal and cubic, and their optical properties showed significant improvement due to silver doping. The 0.5% Ag-doped ZnO NRs showed the highest photocatalytic activity, achieving a degradation rate of 98.5% for phenol removal under solar light irradiation after 5 hours.
Article
Chemistry, Physical
Islam Mohammad Shafiqul, Toshiyuki Yoshida, Yasuhisa Fujita
Summary: Heterojunction light-emitting diodes (LEDs) based on p-type ZnO and n-type ZnMgO nanoparticles have been successfully fabricated. The experimental results show that the LEDs with the p-ZnO/n-ZnMgO/GZO structure exhibit better I-V characteristics and lower leakage current compared to the p-ZnO/GZO LEDs, and the emission intensity is improved by adding the ZnMgO NP layer.
Article
Chemistry, Physical
Havard Molnas, Boris Russ, Steven L. L. Farrell, Madeleine P. P. Gordon, Jeffrey J. J. Urban, Ayaskanta Sahu
Summary: This article introduces a simple technique to achieve p-type and n-type materials based on the same semiconductor using an isoelectronic surface dopant. By surface functionalization, thin p-type colloidal Bi2Te3 nanowires can be switched to n-type, thus increasing the availability of new nanocrystalline solution-processable p-n homojunctions.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Hamideh Hajighasemi, Hosein Eshghi
Summary: Undoped and doped (Co, Cu, N) ZnO nanorods were synthesized using the chemical bath deposition method and their UV sensitivity in the metal-semiconductor-metal configuration was compared. The results showed that the addition of dopants led to n-type conductivity, with different activation energies for different dopants. The doped nanorods exhibited improved crystallinity, higher UV absorbance and the ZnO:Co nanorods showed the highest photoresponse ratio.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Engineering, Environmental
Xinxin Ban, Tao Zhou, Kaizhi Zhang, Qingpeng Cao, Fengjie Ge, Dongen Zhang, Peng Zhu, Zunzheng Liu, Zimin Li, Wei Jiang
Summary: This study demonstrates for the first time that exciplex emission can be achieved by a single pure molecule, called homojunction exciplex. By using a flexible alkyl chain to link the donor and acceptor unit, the resulting compound maintains efficient exciplex emission property and eliminates phase separation issues. This research provides a new avenue for simplifying the structure and enhancing the stability of OLEDs.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Suvindraj Rajamanickam, Sabah M. Mohammad, Ibrahim Abdul Razak, A. Muhammad, Shireen Mohammed Abed
Summary: An innovative method of improving ZnO nanorods-based UV photodetectors was developed by depositing Ag micro-flakes on top of Ag-encapsulated Ag-doped ZnO nanorods. The Ag-doped ZnO nanorods were synthesized through a low-cost hydrothermal method and then subjected to photodeposition using AgNO3 solution. The doping process resulted in thinner and shorter ZnO nanorods with improved crystallinity and reduced deep-level emissions. The fabricated UV photodetectors exhibited enhanced sensitivity and gain compared to non-doped ZnO nanorods, but excess doping led to higher dark current and reduced sensitivity. A proposed mechanism identified Ag micro-flakes and Ag-doped ZnO nanorods as the sources of photocurrents.
MATERIALS RESEARCH BULLETIN
(2023)
