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Six Effects of Enzymes in the Human Body

Six Effects of Enzymes in the Human Body

Do you know when enzymes begin to be produced in the human body? The answer is that they existed during the egg and sperm period. It is also because of the activity of the enzyme that the egg and sperm can be combined. Cell division must use enzyme because the medium,...

5G in new directions just got Weird

5G in new directions just got Weird

Industry group 3GPP takes 5G in new directions in the latest set of standards The only reason you’re able to read this right now is because of the Internet standards created by the Internet Engineering Task Force. So while standards may not always be the most exciting...

Researchers Turning Bricks Into Supercapacitors in 2020

Researchers Turning Bricks Into Supercapacitors in 2020

Researchers at Washington University in St. Louis made a fast energy storage device out of common building bricks As solar panels and wind turbines multiply, the big problem is how with how to store all the excess electricity produced when the sun is up or the wind...

Human Sperm Don’t Swim Like We Thought

Human Sperm Don’t Swim Like We Thought

3D microscope reveals that sperm have been fooling scientists for 350 years For more than three centuries scientists have believed that human sperm swim by swishing their tails in a side-to-side, symmetrical motion. But that’s because we’ve been...

Path to Powerful Analog AI found by Startup and Academics

Path to Powerful Analog AI found by Startup and Academics

Equilibrium propagation allows all-analog training Engineers have been chasing a form of AI that could drastically lower the energy required to do typical AI things like recognize words and images. This analog form of machine learning does one of the key mathematical...

Why Sweat Will Power Your Next Wearable

Why Sweat Will Power Your Next Wearable

Biofuel cells can generate enough watts for fitness trackers and health monitors- By Patrick Mercier and Joseph Wang Here’s how a wearable turns sweat into energy: A fuel cell consists of two electrodes—an anode and a cathode—with an electrolyte between them. The fuel...










Spherical Silicon Solar Cells Absorb Scattered Sunlight

by | Jul 23, 2020 | Tech News | 0 comments




Silicon solar cells folded into spheres hint at solar power’s flexibility in even small devices

By Jeremy Hsu

The spherical solar cell also delivered about 60 percent more power output than its flat counterpart when both could collect only scattered sunlight under a simulated roof rather than receiving direct sunlight. Additional experiments with different reflective backgrounds—including an aluminum cup, aluminum paper, white book , and sand—showed that the hexagonal aluminum cup background helped the spherical photovoltaic cell outperform the flat solar cell by one hundred pc in terms of power output.

Creating the large spherical solar cell required the researchers to etch alternating grooves in 15 percent of a flat solar cell to make a pattern resembling a band of elliptical shapes connected at the middle. A CO2 laser created the appropriate pattern in a polymeric hard mask covering the solar cell and allowed a deep reactive ion etching tool to create grooves in the exposed areas of the silicon solar cell. The flex and bend in those groove areas allowed the researchers to subsequently fold the solar cell into a spherical shape.

Measurement setup of the spherical solar cell under a solar simulator in air and using a regular a white paper as the reflective background material.
Photo: Nazek El-Atab/KAUST
Measurement setup of the spherical solar cell under a solar simulator in air and using a regular a white paper as the reflective background material.

The loss of solar cell material in the areas that have been etched out reduces the overall potential solar power output. But the researchers see cost over time favoring spherical solar cells over flat solar cells in certain parts of the planet because the spherical design is a smaller amount susceptible to dust accumulation and may help dissipate heat that might otherwise reduce the solar cell’s efficiency. In addition, the spherical solar cells don’t require additional costly moving parts to continually track the sun.

Still, the spherical photovoltaic cells might not replace traditional solar cell technology at utility-scale solar energy plants, says Liu at MIT. In his view, this particular spherical photovoltaic cell design could find use in additional niche market applications. He noted that one of his colleagues is currently searching for a solar cell design to cover a golf ball so that it can power a tracker inside the ball. But Liu sees much promise in such ultra-flexible solar cell designs being installed in buildings, cars, or even mobile devices.

Dust accumulation on a spherical solar cell is limited to the silicon area with a small tilt angle.
Image: Rabab Bahabry/University of Jeddah and KAUST
Dust accumulation on a spherical solar cell is limited to the silicon area with a small tilt angle.

“The application of spherical design may seem very limited, but the ability to make commercial silicon solar cells into any shapes would enable broad adaption of photovoltaic in autonomous devices, such as IoT (Internet of Things) sensors, and autonomous vehicles,” Liu says. “If we can fully power these autonomous devices with shaped photovoltaic panels, this could be a game changer.”

Soure: IEEE Spectrum










200 CIVIL ENGINEERING Interview Questions & Answers

200 CIVIL ENGINEERING Interview Questions & Answers

200 CIVIL ENGINEERING Interview Questions & Answers 1. What are the causes of building collapse?The passage of time is one reason. Buildings also collapse due to weak foundations. Earthquakes, hurricanes and other natural disasters can also damage the structure of...

Tesla Valve Working

Tesla Valve Working

Nikola Tesla had invented a very interesting one-way value. Let's understand the complete physics of this valve in this video. https://youtu.be/suIAo0EYwOE

Jobs in TATA

Jobs in TATA

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