Article
Optics
Long Guo, Ke Jiang, Xiaojuan Sun, Zihui Zhang, Jianwei Ben, Yuping Jia, Yong Wang, Dabing Li
Summary: In this study, a photoconductive gain mechanism was successfully introduced into vertical AlGaN SBUV detectors, achieving high responsivity at 233 nm under zero bias. By inserting a multiple-quantum-well structure, carrier lifetime and internal current gain were improved, providing an effective approach for high current gain in vertical AlGaN SBUV detectors at zero bias.
PHOTONICS RESEARCH
(2021)
Article
Multidisciplinary Sciences
Qingyi Zhang, Ning Li, Tao Zhang, Dianmeng Dong, Yongtao Yang, Yuehui Wang, Zhengang Dong, Jiaying Shen, Tianhong Zhou, Yuanlin Liang, Weihua Tang, Zhenping Wu, Yang Zhang, Jianhua Hao
Summary: By lattice and band engineering, Zhang et al. constructed a unipolar barrier avalanche photodiode with suppressed dark current and reinforced reverse breakdown. Ga2O3-based solar blind avalanche photodetectors exhibit low voltage operation, optical filter-free and monolithic integration of photodetector arrays, and therefore they are promising to be an alternative to the bulky and fragile photomultiplier tubes for weak signal detection in deep-ultraviolet region. These findings provide insights into precise manipulation of band alignment in avalanche photodetectors, and also offer exciting opportunities for further developing high-performance Ga2O3-based electronics and optoelectronics.
NATURE COMMUNICATIONS
(2023)
Review
Optics
Nan Wang, Zhiwei Gu, Zexuan Guo, Dayong Jiang, Man Zhao
Summary: To create ultraviolet photodetectors with high sensitivity, detection rate, and responsivity, the lateral growth of ZnO nanowires arrays was controlled on a quartz substrate using a hydrothermal method. The combined effects of the ZnO seed layer and high-quality crystalline nanowires greatly improved the performance of the photodetectors.
JOURNAL OF LUMINESCENCE
(2023)
Article
Optics
Bowei Zhang, Yaxiong Tao, Sandeep Kumar Chamoli, Qi Chen, Kuo Zhao, YueHua Yu, Bin Wang
Summary: This article proposes a method for achieving selective photoresponse using phase-change material antimony trisulfide (Sb2S3) as an active medium. The method allows for dynamic optimization of the photodetector's response through controlled phase transition, while managing heat accumulation through radiative cooling. The study also demonstrates the ability to maintain the photodetector's temperature close to ambient temperature even under high irradiance of 1000 W/m(2).
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Tao Han, Zejiang Wang, Ning Shen, Zewen Zhou, Xuehua Hou, Shufang Ding, Chunzhi Jiang, Xiaoyi Huang, Xiaofeng Zhang, Linlin Liu
Summary: The authors propose a method to overcome the narrow bandgap of near-infrared polymers by using solvent vapor annealing. They form a diffusion interface layer between the channel layer and bulk heterojunction layer, which leads to an improvement in device performance.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Khizar Hayat, Zubair Ali, Vineet Tirth, Ali Algahtani, Tawfiq Al-Mughanam, Abdulaziz H. Alghtani, Hussein Alrobei, Abdullah Shah, Ejaz Ahmed, Said Karim Shah
Summary: Vertically aligned zinc oxide nanorods were grown uniformly over a comb-shaped working area through a wet chemical method. The ZnO nanorods showed semiconductor-like behavior and exhibited substantial photoconductivity under UV light illumination. The conduction mechanism was found to involve small polarons at the grain boundary and correlated barrier hopping at the bulk/grain interface. The high photoconductivity can be attributed to the high surface-to-volume ratio of the nanorods and the generation of electron-hole pairs by UV light absorption.
Review
Nanoscience & Nanotechnology
Jinning Hu, Jun Chen, Teng Ma, Zhenhua Li, J. Hu, T. Ma, Z. Li
Summary: This paper reviews the research progress of different types of ZnO UV PDs and summarizes the effects of different nanostructures on ZnO UV PDs in detail. In addition, physical effects such as piezoelectric photoelectric effect, pyroelectric effect, and three ways of heterojunction, noble metal local surface plasmon resonance enhancement and formation of ternary metal oxides on the performance of ZnO UV PDs were also investigated. The applications of these PDs in UV sensing, wearable devices, and optical communication are displayed. Finally, the possible opportunities and challenges for the future development of ZnO UV PDs are prospected.
Article
Chemistry, Multidisciplinary
Murat Yildirim, Adem Kocyigit, Yasemin Torlak, Esma Yenel, Ali Akbar Hussaini, Mahmut Kus
Summary: Polyoxometalates (POMs) are attractive materials for various applications such as energy storage, catalysis and medicine. In this study, Co and Ni-based POMs were chemically synthesized, characterized, and used to fabricate Schottky-type photodetector devices with Al metal and p-Si semiconductor. The electrical properties of the devices were investigated using current-voltage and current-transient measurements. The results showed that the devices exhibited phototransistor-like characteristics in forward biases, making them suitable for optoelectronic applications.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Physics, Applied
Zesheng Lv, Jiabing Lu, Haoming Xu, Tianzhi Peng, Quan Wen, Gang Wang, Hao Jiang
Summary: Visible-light field effect phototransistors (FEPTs) with high detectivity and high speed are fabricated using a polarization induced photogate in a simple In0.15Ga0.85N/GaN heterostructure. Experimental results show that the polarization electric field can fully deplete the channel layer and leads to an ultra-low dark current, and the channel conductivity can be significantly promoted with visible-light illumination. Therefore, the FEPT achieves a high visible-light gain and a superhigh shot noise limited specific detectivity, as well as a high speed with rise/fall time of 15 ns/160 ns. These results not only present huge potential in visible-light photodetection, but also provide an insight into the application of polarization effects in wide bandgap semiconductors.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Miaomiao Zhang, Shuai Kang, Liang Wang, Kun Zhang, Yutong Wu, Shuanglong Feng, Wenqiang Lu
Summary: A Ga2O3 nanowire network structure was successfully obtained on a sapphire substrate using chemical vapor deposition method, showing potential for high-performance solar-blind UV photodetectors.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Youwei Zhang, Wang Shen, Su Wu, Weijia Tang, Yantao Shu, Kankan Ma, Butian Zhang, Peng Zhou, Shun Wang
Summary: This study demonstrates a field-induced Schottky barrier photodiode based on transition-metal dichalcogenides, showing high responsivity and fast response time. The device achieves high data transmission rates in visible light and infrared light communication applications.
Article
Engineering, Electrical & Electronic
Yan Liang, Bo Xu, Qilai Fei, Wen Wu, Xiao Shan, Kun Huang, Heping Zeng
Summary: In this study, a high-performance GHz-gated InGaAs/InP APD is developed to optimize photon detection efficiency (PDE) and timing jitter, improving the performance of LIDAR. The SPAD has little effect on PDE changes and has a short dead time, making it suitable for rapid mapping of targets. As a proof-of-principle demonstration, the SPAD achieves sub-centimeter depth resolution in a time-of-flight LIDAR system.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Guanqi Li, Ruifan Tang, Na Gao, Cheng Li, Jinchai Li, Kai Huang, Junyong Kang, Rong Zhang
Summary: The research shows that devices fabricated with Au electrodes have lower dark current and higher photocurrent compared to those with Ti electrodes. Devices oxidized for 10 hours with Au electrodes exhibit solar-blind responsivity with a full width at half maxima of 12 nm, attributed to the thicker Ga2O3 film.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Review
Materials Science, Multidisciplinary
Vinod Panwar, Sukanta Nandi, Mandira Majumder, Abha Misra
Summary: This article discusses the efforts to develop self-powered photodetectors (PDs) using ZnO-based heterointerfaces for an improved pyro-phototronic effect. It focuses on the pyro-phototronic effect, exploring ZnO-based materials, doped ZnO-based materials, and ZnO-based materials with the plasmonic effect. The article concludes with a discussion on the challenges in the state-of-the-art technology and possible directions for future research.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Physical
Fengyuan Lin, Jinzhi Cui, Zhihong Zhang, Zhipeng Wei, Xiaobing Hou, Bingheng Meng, Yanjun Liu, Jilong Tang, Kexue Li, Lei Liao, Qun Hao
Summary: A high-performance GaAs nanowire photodetector was fabricated by modifying the surface defects with Au nanoparticles. Plasmons and Schottky barriers were introduced to enhance light absorption and carrier separation. The modified photodetectors showed reduced dark current and increased photocurrent and responsivity. The improvement in performance was analyzed using the energy band theory model. This work proposes a new method to enhance the performance of GaAs nanowire photodetectors.
Article
Multidisciplinary Sciences
Dylan C. Ullery, Sina Soleymani, Andrew Heaton, Juan Orphee, Les Johnson, Rohan Sood, Patrick Kung, Seongsin M. Kim
SCIENTIFIC REPORTS
(2018)
Article
Chemistry, Physical
P. S. Shinde, P. R. Fontenot, J. P. Donahue, J. L. Waters, P. Kung, L. E. McNamara, N. I. Hammer, A. Gupta, S. Pan
JOURNAL OF MATERIALS CHEMISTRY A
(2018)
Article
Optics
Antaryami Mohanta, Jay G. Simmons, Gang Shen, Seongsin M. Kim, Patrick Kung, Henry O. Everitt
JOURNAL OF LUMINESCENCE
(2019)
Article
Physics, Applied
Phuong X. Nguyen, Sourav Garg, Wang-Kong Tse, Shanlin Pan, Patrick Kung, Seongsin M. Kim
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Multidisciplinary Sciences
Sina Soleymani, M. Zeki Gungordu, Patrick Kung, Seongsin M. Kim
SCIENTIFIC REPORTS
(2019)
Article
Chemistry, Physical
Lyndi E. Strange, Jeetika Yadav, Sourav Garg, Pravin S. Shinde, Joshua W. Hill, Caleb M. Hill, Patrick Kung, Shanlin Pan
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2020)
Article
Chemistry, Physical
Justin L. Rife, Patrick Kung, Ryan J. Hooper, Jimmy Allen, Gregory B. Thompson
Article
Multidisciplinary Sciences
Sergio Catalan-Gomez, Maria Briones, Sandra Cortijo-Campos, Tania Garcia-Mendiola, Alicia de Andres, Sourav Garg, Patrick Kung, Encarnacion Lorenzo, Jose Luis Pau, Andres Redondo-Cubero
SCIENTIFIC REPORTS
(2020)
Article
Chemistry, Multidisciplinary
Sourav Garg, J. Pierce Fix, Andrey Krayev, Connor Flanery, Michael Colgrove, Audrey R. Sulkanen, Minyuan Wang, Gang-Yu Liu, Nicholas J. Borys, Patrick Kung
Summary: The study characterizes the interface in lateral heterostructures of single-layer MoS2/WS2 using TERS, showing variations in size and composition. Nanoscale imaging of the Raman spectra reveals the evolution of the interface.
Article
Chemistry, Physical
Sandra Cortijo-Campos, Patrick Kung, Carlos Prieto, Alicia de Andres
Summary: The complex Raman spectra of single- to few-layer MoS2 are sensitive to variables like the number of layers, growth method, and substrate, with specific peaks showing strong dependence on electronic structure modifications, substrate coupling, and temperature. Peaks unique to vapor deposition methods suggest the presence of specific defects.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Electrochemistry
Lyndi E. Strange, Sourav Garg, Patrick Kung, Md Ashaduzzaman, Gregory Szulczewski, Shanlin Pan
Summary: This study presents a method for preparing transition metal dichalcogenides (TMD) and TMD bilayer electrodes using electrodeposition for electrocatalytic hydrogen evolution reaction (HER). The results demonstrate cost-effective deposition techniques and enhanced proton reduction activity for sequentially deposited bilayer TMD structures (including MoS2 and MoSe2).
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Juan M. Marmolejo-Tejada, J. Pierce Fix, Patrick Kung, Nicholas J. Borys, Martin A. Mosquera
Summary: Recent studies have focused on atomically thin lateral heterostructures for modifying the properties of 2D semiconductor systems. Tip-enhanced Raman scattering (TERS) imaging and spectroscopy have been used to characterize the interfaces of these heterostructures, showing a continuous evolution of the Raman-active modes. In this study, density functional theory (DFT) is used to calculate the evolution of vibrational modes, Raman spectra, optical absorption, and electronic structure of various alloys. The calculations confirm the extended alloyed nature of the heterostructure interface and provide a direct mapping of TERS spectra to local alloy compositions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Sergio Catalan-Gomez, Sourav Garg, Andres Redondo-Cubero, Nuria Gordillo, Alicia de Andres, Flavio Nucciarelli, Seonsing Kim, Patrick Kung, Jose Luis Pau
NANOSCALE ADVANCES
(2019)
Article
Nanoscience & Nanotechnology
Hyeokjae Kwon, Sourav Garg, Ji Hoon Park, Yeonsu Jeong, Sanghyuck Yu, Seongsin M. Kim, Patrick Kung, Seongil Im
NPJ 2D MATERIALS AND APPLICATIONS
(2019)
Proceedings Paper
Optics
Elizabath Philip, Sharmistha Pal, Hancheng Shen, M. Zeki Gungordu, Sina Soleymani, Patrick Kung, Seongsin Margaret Kim
2018 IEEE RESEARCH AND APPLICATIONS OF PHOTONICS IN DEFENSE CONFERENCE (RAPID)
(2018)