• 4 minute Hey Oil Bulls - How Long Till Increasing Oil Prices and Strengthening Dollar Start Killing Demand in Developing Countries?
  • 8 minutes Could oil demand collapse rapidly? Yup, sure could.
  • 15 minutes Oil and Trade War
  • 3 hours Could oil demand collapse rapidly? Yup, sure could.
  • 11 hours Migrants: Italy Wants EU Border Agency In Africa, Not At Sea
  • 8 hours Are EVs Safer Than Combustion Engine Vehicles?
  • 4 hours What If Canada Had Wind and Not Oilsands?
  • 7 hours WE Solutions plans to print cars
  • 6 hours Russia, Saudi Push For Big Hike In Oil Output Despite Iran Opposition
  • 7 hours Oil prices going down
  • 12 hours Nopec Sherman act legislation
  • 11 hours Sell out now or hold on?
  • 14 hours The Irrelevance Of BTU Rating - Big Oil's Gimmick To Hoodwink The Public
  • 16 hours China & India in talks to form anti-OPEC
  • 18 hours Sabotage at Tesla
  • 14 hours After Three Decade Macedonia End Dispute With Greece, new name: the Republic of Northern Macedonia
  • 13 hours Trump Hits China With Tariffs On $50 Billion Of Goods
  • 6 hours Oil and Trade War
  • 6 hours Australia mulls LNG import
Alt Text

The World’s Largest “Virtual Power Plant”

Tesla has announced plans to…

Alt Text

China Outpaces Competition In Renewable Race

China’s ambitious renewable goals, spurred…

Futurity

Futurity

Futurity covers research news from the top universities in the US, UK, Canada and Australia

More Info

Trending Discussions

This Solar Cell Transformation Will Make Self-Driving Cars Safer

solar

Engineers working to make solar cells more cost effective ended up finding a method for making sonar-like collision avoidance systems in self-driving cars.

The twin discoveries started, the researchers say, when they began looking for a solution to a well-known problem in the world of solar cells.

“…the huge ramp up in autonomous vehicles and LIDAR suddenly made this 100 times more important…”

Solar cells capture photons from sunlight in order to convert them into electricity. The thicker the layer of silicon in the cell, the more light it can absorb, and the more electricity it can ultimately produce. But the sheer expense of silicon has become a barrier to solar cost-effectiveness.

So the engineers figured out how to create a very thin layer of silicon that could absorb as many photons as a much thicker layer of the costly material. Specifically, rather than laying the silicon flat, they nanotextured the surface of the silicon in a way that created more opportunities for light particles to be absorbed.

Their technique increased photon absorption rates for the nanotextured solar cells compared to traditional thin silicon cells, making more cost-effective use of the material.

Sonar but with light

After the researchers shared these efficiency figures, engineers working on autonomous vehicles began asking whether this texturing technique could help them get more accurate results from a collision-avoidance technology called LIDAR, which is conceptually like sonar except that it uses light rather than sound waves to detect objects in the car’s travel path. Related: The Bearish Backlash In Energy This Fall

LIDAR works by sending out laser pulses and calculating the time it takes for the photons to bounce back. The autonomous car engineers understood that current photon detectors use thick layers of silicon to make sure they capture enough photons to accurately map the terrain ahead. They wondered if texturing a thin layer of silicon, much like on the solar cells, would lead to more accurate maps than the current thin silicon.

Indeed, in their new paper, James Harris, a professor in the School of Engineering at Stanford University, and graduate student Kai Zang report that their textured silicon can capture as many as three to six times more of the returning photons than today’s LIDAR receivers.

They believe this will enable self-driving car engineers to design high-performance, next-generation LIDAR systems that would continuously send out a single laser pulse in all directions. The reflected photons would be captured by an array of textured silicon detectors, creating moment-to-moment maps of pedestrian-filled city crosswalks.

2 LIDAR problems

Harris says the texturing technology could also help to solve two other LIDAR problems unique to self-driving cars—potential distortions caused by heat and the machine equivalent of peripheral vision. Related: U.S. Oil Rig Count Falls As Prices Falter

The heat problem occurs because the LIDAR laser apparatus can heat up during extended use, causing photon wavelengths to shift slightly. Such shifts could cause light particles to bounce off traditional silicon that is made to absorb specific wavelengths. But the nanotexturing technology can absorb photons across a broad spectrum, eliminating this heat-shift issue.

With respect to the machine equivalent of peripheral vision, the researchers believe it may be possible to make a flexible version of their nanotextured silicon receptor. Flexibility would allow them to curve the receptor. Between that and the light-trapping advantage of their nanotextured surface, they think it may be possible for LIDAR systems to enlarge the angle of acceptance for photons, in order to more completely identify all potential obstacles.

Harris says he always thought Zang’s texturing technique was a good way to improve solar cells. “But the huge ramp up in autonomous vehicles and LIDAR suddenly made this 100 times more important,” he says.

The researchers report their work in the journal Nature Communications.

By Futurity

More Top Reads From Oilprice.com:


x


Back to homepage

Trending Discussions


Leave a comment

Leave a comment




Oilprice - The No. 1 Source for Oil & Energy News