Article
Materials Science, Multidisciplinary
Jie Zhang, Fengjing Liu, Dong Liu, Yanxue Yin, Mingxu Wang, Zixu Sa, Li Sun, Xiaoxin Zheng, Xinming Zhuang, Zengtao Lv, Wenxiang Mu, Zhitai Jia, Yang Tan, Feng Chen, Zai-xing Yang
Summary: The study investigates the photodetection performance of thin amorphous Ga2O3 nanosheet, which has been widely used as dielectric and passivation materials. By peeling off from the Ga solid-melt surface, the amorphous Ga2O3 nanosheet is confirmed to have an amorphous characteristic through selected area electron diffraction and X-ray diffraction. However, due to limited absorption ability and abundant defect states, the amorphous Ga2O3 nanosheet shows low photocurrent and slow response time even at a bias voltage. To enhance the photodetection performance, PbI2 nanosheet is grown on the surface of the amorphous Ga2O3 nanosheet, forming a Ga2O3/PbI2 heterojunction photodetector. The heterojunction photodetector exhibits larger photocurrent (1.6 nA) and faster response times (2 ms rise time and 3 ms decay time) even at a zero bias voltage, and it also shows excellent self-powered photoresponse characteristic and mechanical flexibility when configured into a flexible photodetector. This work provides a pathway for the development of high-performance flexible optoelectronic devices.
MATERIALS TODAY PHYSICS
(2023)
Article
Physics, Multidisciplinary
Tong Mei, Shan Li, Shaohui Zhang, Yuanyuan Liu, Peigang Li
Summary: This paper describes the performance of an epsilon-Ga2O3 film/ZnO nanoparticle hybrid heterojunction deep UV photodetector for 254 nm wavelength sensing. The photodetector can operate in both power supply mode and self-powered mode, delivering excellent photoelectrical properties in each. The results lay a solid foundation for the application of epsilon-Ga2O3/ZnO heterojunction in deep UV sensors.
Article
Engineering, Multidisciplinary
Shan Li, Zeng Liu, Maolin Zhang, Lili Yang, Yufeng Guo, Weihua Tang
Summary: This paper presents a self-powered ultraviolet photodetector with high performance at zero bias by constructing a hybrid heterojunction of n-type GaN film and p-type PEDOT:PSS material. The device exhibits excellent self-powered photoelectrical properties in dual-band and achieves outstanding photodetection performance parameters with high reliability.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Chemistry, Physical
Sunil Agrohiya, Ravinder Singh, Sajjan Dahiya, Ishpal Rawal, Amit Kumar, Anil Ohlan, R. Punia, A. S. Maan
Summary: Pure and zinc-doped cobalt oxide heterojunction devices have been fabricated on n-type silicon substrates using sol-gel spin coating deposition. The introduction of Zn2+ into Co3O4 results in a substantial increase in the photoresponse, detectivity, EQE values, and linear dynamic range (LDR) of the devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Guo-Liang Ma, Ang Gao, Zeng Liu, Wei-Ming Sun, Shan Li, Zu-Yong Yan, Wei-Yu Jiang, Bing-Yang Sun, Xiao-Hui Qi, Pei-Gang Li, Wei-Hua Tang
Summary: In this study, a self-powered deep ultraviolet photodetector based on Ga2O3/BFO heterojunction was fabricated, showing excellent deep UV signal detection ability and potential for self-powered deep UV photodetection applications.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Physical
Wushuang Han, Kewei Liu, Jialin Yang, Xing Chen, Qiu Ai, Yongxue Zhu, Zhen Cheng, Binghui Li, Lei Liu, Dezhen Shen
Summary: This study demonstrates a high-performance self-powered UV-visible photodetector enhanced by the ferroelectric effect on amorphous BaTiO3/p-Si heterojunction. The device achieves significantly improved responsivities of 14 mA/W, 27 mA/W, and 223 mA/W at 254 nm, 365 nm, and 600 nm, respectively, outperforming other BaTiO3-based self-driven photodetectors reported. The device also exhibits a fast response speed with rising/fall times of 450 μs/460 μs at 254 nm and 80 μs/140 μs at 600 nm. The defect-assisted recombination of photogenerated carriers at the amorphous BaTiO3/p-Si interface and grain boundaries enables the visualization of transient photocurrent spikes under 254 nm illumination. This work presents a novel strategy for the design and research of high-performance self-powered photodetectors.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Harmanpreet Kaur Sandhu, John Wellington John, Alka Jakhar, Abhishek Sharma, Alok Jain, Samaresh Das
Summary: This study demonstrates the fabrication of MoSe2/p-GaN heterostructure for light detection, exhibiting low noise broadband spectral response and high photocurrent to dark current ratio. The device achieves high responsivity and low noise equivalent power at an applied bias of 1 V, with fast rise/fall time.
Article
Engineering, Electrical & Electronic
Parashurama Salunkhe, Prashant Bhat, Dhananjaya Kekuda
Summary: NiO/ZnO thin film heterojunction diodes were constructed using dc magnetron sputtering technique and their performance for ultraviolet sensor applications was evaluated. The device configuration, ITO/ZnO/NiO/Ag, showed excellent current-voltage rectifying characteristics at room temperature. The photodetector characteristics of the fabricated ITO/ZnO/NiO thin film stack were evaluated after rapid thermal annealing treatment. The diodes were tested under 365 nm UV light illumination and showed a fast response speed and stable photo detectivity in self-powered mode.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Materials Science, Multidisciplinary
Ang Gao, Weiyu Jiang, Guoliang Ma, Zeng Liu, Shan Li, Zuyong Yan, Weiming Sun, Shaohui Zhang, Weihua Tang
Summary: A stable lead-free CsCu2I3 film was successfully prepared and coupled with Ga2O3 to create a deep ultraviolet photodetector. The photodetector showed sensitivity to 254 nm UV light, good reproducibility, and an ultra-high PDCR.
CURRENT APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Menghan Jia, Libin Tang, Kar Seng Teng, Yanfei Lu
Summary: In this study, a self-powered UV photodetector with high performance and low energy consumption was fabricated. The effect of different films on the performance of the photodetector was investigated.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Guojiao Xiang, Jinming Zhang, Zhiang Yue, Xian Zhang, Chengle Song, Bingxin Ding, Lukai Wang, Yang Wang, Hangyu He, Hui Wang, Yang Zhao
Summary: In this study, a self-powered p-CuI/n-GaN heterojunction UV photodetector was successfully fabricated using a vacuum thermal evaporation method. The photodetector exhibited high light response, fast response time, and excellent stability and recovery performance.
APPLIED SURFACE SCIENCE
(2023)
Article
Physics, Multidisciplinary
Li-Li Yang, Yu-Si Peng, Zeng Liu, Mao-Lin Zhang, Yu-Feng Guo, Yong Yang, Wei-Hua Tang
Summary: A self-powered solar-blind ultraviolet (UV) photodetector (PD) was successfully fabricated on a Ga2O3/Bi2WO6 heterojunction. The PD demonstrated a distinct photovoltaic effect and excellent photodetection performance with an ultra-low dark current and a high light-to-dark current ratio in self-powered mode. The PD also showed a stable and fast response speed under different light intensities and voltages. Overall, the Ga2O3/Bi2WO6 heterojunction has the potential to be a candidate for self-powered and high-performance UV photodetectors.
Article
Materials Science, Multidisciplinary
Haozhe Li, Jian Yuan, Qinzhuang Liu, Haoran Mu
Summary: In this paper, an alpha-In2Se3/PtSe2 heterojunction photodetector is fabricated, which achieves a wide wavelength response from 405 to 1550 nm and a fast response speed of about 127 μs, taking advantage of the high mobility and narrow bandgap of PtSe2. The photodetector can work without any external bias due to the strong built-in electric field between In2Se3 and PtSe2, with a responsivity as high as 80 mA/W. This fast self-powered In2Se3/PtSe2 photodetector presents a pathway for future low-energy-consumption optoelectronics.
Article
Nanoscience & Nanotechnology
Shuang Qiao, Yuan Liu, Jihong Liu, Guangsheng Fu, Shufang Wang
Summary: By combining organic-inorganic hybrid perovskite layers of different band gaps and thicknesses, a series of narrowband perovskite heterojunction photodetectors with adjustable spectral range have been designed and prepared, showing excellent photoresponse performances and self-powered properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Ceramics
Shun Wang, Honglie Shen
Summary: This work proposed fast response and broadband self-powered photodetectors based on heterojunctions of vertical smooth silicon nanowires. The devices achieved self-driven detection under UV-VIS-NIR light irradiation without an external energy supply. The CZTS/SiNWs core-shell heterojunctions exhibited excellent light response characteristics and rectification characteristics.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
P. Michael Preetam Raj, M. P. Srinivasan, Souvik Kundu
Summary: Multi-bit data can be programmed into a memristor through frequency and time based modulation. Novel memristive programming techniques were proposed to enhance design freedom. A memristor based FSK demodulator with lower circuit complexity and smaller on-chip area was implemented. The effect of random telegraph noise was mitigated using a simple current mirror approach. These approaches open up new possibilities for developing futuristic circuits with lower power consumption, on-chip area and latency in electronics and communication.
IETE JOURNAL OF RESEARCH
(2022)
Article
Computer Science, Hardware & Architecture
P. Michael Preetam Raj, Arvind Subramaniam, Souvik Kundu
Summary: The combination of memristor and bipolar junction transistor in circuits shows stable electronic characteristics, tunable current regulation, and reduced circuit complexity. The circuit also exhibits strong stability to frequency variations, improved linearity, and variable negative resistance, which can be used for solving linear equations and implementing pulse signal generators. These results were obtained through simulation and fabrication routes, paving the way for futuristic oscillators and logic control circuits with reduced on-chip area for portable electronic systems.
ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING
(2021)
Article
Biochemical Research Methods
Prateek Raj, S. Karthik, S. M. Arif, U. Varshney, M. Vijayan
ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY
(2020)
Article
Engineering, Electrical & Electronic
Priyanka B. Ganganaik, G. Abhijith, P. Michael Preetam Raj, H. Renuka, B. V. V. S. N. Prabhakar Rao, Souvik Kundu
Summary: In this work, an oxide memristor was used for analog computing and exhibited controllable transitions within its stable resistive states. The proposed memristive state machine, tailored for tunable edge detection, outperformed conventional software-based edge detection systems with an 8% improvement in accuracy. With its simplicity and accuracy, this system shows potential as an efficient alternative to conventional systems and paves the way for future low hardware-based smart system designs.
IETE JOURNAL OF RESEARCH
(2023)
Article
Microbiology
Ve Van Le, Haeseong Lee, Shalem Raj Padakandla, In-Tae Cha, Ki-Eun Lee, Jong-Chan Chae
Summary: Bacterium P2-65(T) is a novel species of the genus Flavobacterium, with a wide range of growth conditions and close relationships with certain Flavobacterium species.
ARCHIVES OF MICROBIOLOGY
(2021)
Article
Computer Science, Hardware & Architecture
Aditya Viswakumar, Priyanka B. Ganganaik, P. Michael Preetam Raj, B. V. V. S. N. Prabhakar Rao, Souvik Kundu
Summary: Effort was devoted to develop an in-memory processor for Bayesian text classification using memristive crossbar architecture, which proved to be efficient with an average accuracy of 91% on two distinct datasets. This work paves the way for hardware realization of cognitive systems using in-memory processors.
COMPUTERS & ELECTRICAL ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Pavan Kumar Reddy Boppidi, Bharathwaj Suresh, G. Abhijith, P. Michael Preetam Raj, Souri Banerjee, Souvik Kundu
Summary: In this research, Pt/Cu:ZnO/Nb:STO memristive devices were found to exhibit random switching behavior, leading to the development of a Stochastic Voltage Threshold Adaptive Memristor (SVTAM) model. This model enables an innovative method to perform arithmetic operations using a memristor crossbar architecture, allowing for compact and simultaneous implementation of a large number of functions. The functionality was successfully verified with low input pulses and minimal error, making it a novel solution in the field of approximate computing.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Infectious Diseases
Lalit Kishore Ahirwar, Esther Sheba, Saumya Jakati, Rajagopalaboopathi Jayasudha, Shalem Raj Padakandla, Bhupesh Bagga, Savitri Sharma
Summary: This study reports the clinico-microbiological features of Macrophomina phaseolina keratitis. DNA sequencing, phylogenetic analysis, and specific PCR confirmed the presence of Macrophomina phaseolina in six patients with keratitis. Although the susceptibility testing showed the organism to be susceptible to natamycin, five patients did not respond to treatment and needed keratoplasty.
Article
Multidisciplinary Sciences
Shalem Raj Padakandla, Taraprasad Das, Gumpili Sai Prashanthi, Kiran Kumar Angadi, S. Sreenivasa Reddy, G. Bhanuprakash Reddy, Sisinthy Shivaji
Summary: This study compared the gut mycobiomes of diabetic rats and diabetic rats with retinal changes with normal control rats, indicating dysbiosis at the genus level in both diabetic groups. The researchers speculated that increased pathogenic fungi may contribute to inflammatory status in both diabetic rats and rats showing retinal changes.
Article
Chemistry, Medicinal
Prateek Raj, Karthik Selvam, Koyel Roy, Shailesh Tripathi, Sharyu Kesharwani, Balasubramanian Gopal, Umesh Varshney, Sandeep Sundriyal
Summary: This study conducted the first structure-based virtual screening and discovered a series of potential compounds inhibiting Mycobacterium tuberculosis uracil-DNA glycosylase. One compound exhibited better inhibitory effect than known inhibitors. These compounds represent a diverse set of scaffolds for developing next-generation MtUng inhibitors.
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
(2022)
Article
Ophthalmology
Taraprasad Das, Shalem Raj Padakandla, Sisinthy Shivaji, Rajagopalaboopathi Jayasudha, Brijesh Takkar
Summary: This study compared the microbiome in the aqueous humour and gut of people with diabetes mellitus (DM) with and without diabetic retinopathy (DR). It was found that there are differences in the microbiome of the eye and gut regardless of disease or health. The intraocular microbiome showed more distinct features compared to the gut, but further confirmation is needed with larger studies.
OPHTHALMOLOGY AND THERAPY
(2023)
Article
Biology
Jini Sugatha, Amulya Priya, Prateek Raj, Ebsy Jaimon, Uma Swaminathan, Anju Jose, Thomas John Pucadyil, Sunando Datta, Felix Campelo
Summary: SNX32 interacts with SNX4 via its BAR domain and with TfR, CIMPR, and BSG through its PX domain, regulating cargo sorting and trafficking processes. Silencing of SNX32 leads to defects in intracellular trafficking and neuronal differentiation, suggesting its crucial role in maintaining neuroglial coordination.
Article
Engineering, Electrical & Electronic
P. Michael Preetam Raj, Sravan K. Vittapu, Sree Giri Prasad Beri
Summary: Great attention is being paid to resistive switching devices due to their lower switching voltage, higher tolerance, higher scalability, multi-bit operations, and longer information storage time compared to transistor technology. This study successfully synthesized a Cu/Cu: ZnO/Cu resistive switching device and demonstrated previously unreported important characteristics.
IETE JOURNAL OF RESEARCH
(2023)
Article
Ophthalmology
Shalem Raj Padakandla, Taraprasad Das, Gumpili Sai Prashanthi, Kiran Kumar Angadi, S. Sreenivasa Reddy, G. Bhanuprakash Reddy, Sisinthy Shivaji
Summary: The gut bacterial microbiome of diabetic rats with retinal changes showed dysbiosis compared to control rats at phylum and genus levels. This study could potentially lead to the development of novel therapeutics for diabetic individuals with retinal changes.
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Avani Mehta, Prateek Raj, Sandeep Sundriyal, Balasubramanian Gopal, Umesh Varshney
Summary: Uracil DNA glycosylases are crucial enzymes for DNA repair in mycobacteria, particularly due to the high risk of cytosine deamination in their genomes. A fluorescence-based assay has been developed to evaluate the activity of this enzyme, allowing for high-throughput screening of inhibitors. This method shows promise for identifying potential inhibitors of Mycobacterium tuberculosis uracil DNA glycosylase.
BIOCHEMISTRY AND BIOPHYSICS REPORTS
(2021)
