PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Mixed-dimensional nanowires/nanosheet heterojunction of GaSb/Bi2O2Se for self-powered near-infrared photodetection and photocommunication

2025-08-12
(Press-News.org)

In the rapidly advancing field of optoelectronics, self-powered near-infrared (NIR) photodetectors are gaining attention for applications in imaging, environmental monitoring, and optical communication. Recently, a research team from Shandong University led by Professor Zai-xing Yang has made a significant leap forward by constructing a novel mixed-dimensional heterojunction between GaSb nanowires (NWs) and Bi2O2Se nanosheets (NSs). This breakthrough device demonstrates ultralow dark current, ultrafast response, and multifunctional capabilities — all without an external power supply.

Why This Research Matters

Record-Low Dark Current: The GaSb/Bi2O₂Se NW/NS and NW array/NS devices achieve ultralow dark currents of 0.07 pA and 0.08 pA, respectively, enabling exceptionally clean signal detection. Ultrafast Response: Response times of < 2 ms (single NW/NS) and 6/4 ms (NW array/NS) outperform most comparable systems, crucial for high-speed data processing. Broadband Sensitivity: Effective photodetection from visible to 1310 nm wavelengths makes these devices versatile for diverse NIR applications. Integrated Functionality: Beyond detection, the devices successfully demonstrated self-powered imaging and optical data transmission.

Innovative Design and Mechanisms

Mixed-Dimensional Type-II Heterojunction: Combining 1D GaSb NWs and 2D Bi2O2Se NSs yields a built-in electric field (~140 meV) that promotes rapid, bias-free separation of photo-generated carriers. Array Architecture for Enhanced Performance: Ordered NW arrays, fabricated via contact printing, provide larger active areas, stronger photocurrents, and improved Ilight/Idark ratios. Interface Characterization: Advanced tools such as Kelvin probe force microscopy (KPFM), XRD, and AFM confirm precise band alignment and high-quality heterointerfaces.

Applications and Future Outlook

Imaging: The team demonstrated single-pixel imaging of a “panda,” highlighting potential for compact NIR cameras. Photocommunication: Successful ASCII code transmission (“HAPPY”) proves feasibility for secure, high-speed optical links. Next Steps: Scaling up fabrication, integrating with flexible substrates, and exploring other material pairings could open new pathways for wearable sensors, IoT devices, and space-borne imaging systems. Stay tuned for more exciting developments from Prof. Yang’s group as they continue redefining the boundaries of self-powered optoelectronics and NIR photodetection technology.

END



ELSE PRESS RELEASES FROM THIS DATE:

Universities that eliminated admission test requirements saw gains in student body diversity

2025-08-12
  Universities that have eliminated standardized test requirements for admissions in recent years generally experienced gains in diversity in their student bodies, according to research by the University of California, Davis. However, if the universities also faced recent financial shortfalls or enrollment declines, or continued to prioritize quantitative academic criteria such as test scores and class rank, these gains in diversity diminished or disappeared. The paper, “Same Policy, No Standardized Outcome: How Admissions Values and Institutional Priorities ...

Head-to-head against AI, pharmacy students won

2025-08-11
TUCSON, Ariz. — Students pursuing a Doctor of Pharmacy degree routinely take – and pass – rigorous exams to prove competency in several areas. Can ChatGPT accurately answer the same questions? A new study by University of Arizona R. Ken Coit College of Pharmacy researchers said no, it can’t. Researchers found that ChatGPT 3.5, a form of artificial intelligence, fared worse than PharmD students in answering questions on therapeutics examinations that ensure students have the knowledge, skills, and critical thinking abilities to provide safe, effective and patient-centered care. ChatGPT was less likely to correctly answer application-based questions (44%) ...

Only some emotions help posts go viral

2025-08-11
The positive emotions of love and joy might seem to have much in common. Similarly, anxiety and anger appear to be close emotional siblings. But on social media, seemingly similar emotions can lead to very different responses. According to new research by Yifan Yu, assistant professor of information, risk, and operations management at Texas McCombs, certain emotions pack a bigger punch than others when it comes to how posts spread on social media. “Some emotions, like anxiety and love, help content go viral, while others, like anger or sadness, tend to slow ...

Predicting risk in children with heart defects

2025-08-11
A multi-center study has identified critical risk factors that increase the likelihood of death in children with a heart defect who are awaiting or have recently undergone heart transplantation, according to findings published in Circulation. Fontan circulatory failure (FCF) is a long-term complication in children born with single-ventricle heart defects who have undergone a series of surgeries that culminates with the Fontan procedure. While this surgery helps reroute blood flow and extend life expectancy, it can lead to chronic health problems, including ...

Test performance improves when children can exercise briefly beforehand, UNCG researchers find

2025-08-11
A new study from UNC Greensboro (UNCG) researchers suggests giving children just nine minutes to engage in high-intensity interval exercise can boost their academic performance.   “In the classroom, you have teachers that say, ‘Let’s take a movement break to get you focused again,’” said lead author and UNCG Assistant Professor Eric Drollette, Ph.D.. “We know that’s the case anecdotally in the classroom, but we hadn’t put the science to it.”   Investigating the science behind this classroom wisdom, the researchers created a short sequence of exercises that can be completed in ...

Meet IDEA: An AI assistant to help geoscientists explore Earth and beyond

2025-08-11
A new artificial intelligence tool developed by researchers at the University of Hawai‘i (UH) at Mānoa is making it easier for scientists to explore complex geoscience data—from tracking sea levels on Earth to analyzing atmospheric conditions on Mars. Called the Intelligent Data Exploring Assistant (IDEA), the software framework combines the power of large language models, like those used in ChatGPT, with scientific data, tailored instructions, and computing resources. By simply providing questions in everyday ...

Ready for market: New process boosts clean, cost-efficient chemical production

2025-08-11
Building on their success developing a cleaner way to make valuable organic acids, researchers from the Center for Advanced Bioenergy and Bioproducts Innovation (CABBI) have pushed one product closer to commercialization with a major upgrade in yield. A CABBI team from the University of Illinois Urbana-Champaign and Princeton University re-engineered the metabolism of the yeast Issatchenkia orientalis to supercharge its fermentation of plant glucose into succinic acid – an important industrial chemical used in food additives and a diverse array of agricultural and pharmaceutical products. Since ...

Losing weight before IVF may increase chance of pregnancy

2025-08-11
Embargoed for release until 5:00 p.m. ET on Monday 11 August 2025    Follow @Annalsofim on X, Facebook, Instagram, Bluesky, and Linkedin              Below please find summaries of new articles that will be published in the next issue of Annals of Internal Medicine. The summaries are not intended to substitute for the full articles as a source of information. This information is under strict embargo and by taking it into possession, media representatives are committing to the terms of the embargo ...

New study uncovers how genetics and lifestyle drive the heart disease dilated cardiomyopathy

2025-08-11
An international team, led by scientists from the Victor Chang Cardiac Research Institute has studied around 3000 people affected by the heart disease dilated cardiomyopathy (DCM) – a driver of heart failure and sudden cardiac arrest. They discovered those who had a mutation in a particular gene called TTN were 21 times more likely to develop the disease than family members who did not carry a mutation. For the first time, the team found that a person's general health and lifestyle factors; such as being overweight or having high alcohol consumption, contributed to an earlier DCM diagnosis. The study published in the European Heart Journal involving 1000 families affected ...

City of Hope study shows childhood cancer survivors face new health problems later in life

2025-08-11
LOS ANGELES — Researchers at City of Hope®, one of the largest and most advanced cancer research and treatment organizations in the United States with its National Medical Center ranked among the nation’s top cancer centers by U.S. News & World Report, today published a new study which found that some survivors of childhood cancer are more at risk for serious health issues as they grow older, including new cancers and chronic conditions like heart disease.  While a cause for concern, the findings published in the Journal of Clinical Oncology also point to a silver ...

LAST 30 PRESS RELEASES:

Calorie labelling linked to 2% average reduction in energy content of menu items

Widely prescribed opioid painkiller tramadol not that effective for easing chronic pain

Exercise snacks may boost cardiorespiratory fitness of physically inactive adults

15,000 women a year with breast cancer could benefit from whole genome sequencing, say researchers

Study highlights risks of Caesarean births to future pregnancies

GLP-1 agonists pose emerging challenge for PET-CT imaging, study finds

Scripps Research scientists unlock new patterns of protein behavior in cell membranes

Panama Canal may face frequent extreme water lows in coming decades

Flash Joule heating lights up lithium extraction from ores

COMBINEDBrain and MUSC announce partnership to establish biorepository for pediatric cerebrospinal fluid and CNS tissue bank

Questionable lead reporting for drinking water virtually vanished after Flint water crisis, study reveals

Assessing overconfidence among national security officials

Bridging two frontiers: Mitochondria & microbiota, Targeting Extracellular Vesicles 2025 to explore game-changing pathways in medicine

New imaging tech promises to help doctors better diagnose and treat skin cancers

Once dominant, US agricultural exports falter amid trade disputes and rising competition

Biochar from invasive weed shields rice from toxic nanoplastics and heavy metals

Rice University announces second cohort of Chevron Energy Graduate Fellows

Soil bacteria and minerals form a natural “battery” that breaks down antibiotics in the dark

Jamestown colonists brought donkeys, not just horses, to North America, old bones reveal

FIU cybersecurity researchers develop midflight defense against drone hijacking

Kennesaw State researcher aims to discover how ideas spread in the digital age

Next-generation perovskite solar cells are closer to commercial use

Sleep patterns linked to variation in health, cognition, lifestyle, and brain organization

University of Oklahoma researcher awarded funding to bridge gap between molecular data and tissue architecture

Nationally-recognized pathologist Paul N. Staats, MD, named Chair of Pathology at University of Maryland School of Medicine

The world’s snow leopards are very similar genetically. That doesn’t bode well for their future

Researchers find key to stopping deadly infection

Leafcutter ants have blind spots, just like truck drivers

Tayac receives funding for community engagement project

Parker receives funding for Elementary Education Program Professional Development School (PDS)

[Press-News.org] Mixed-dimensional nanowires/nanosheet heterojunction of GaSb/Bi2O2Se for self-powered near-infrared photodetection and photocommunication