"Avian eye-inspired perovskite artificial vision system for foveated and multispectral imaging".

The paper is paywalled, but from the abstract what I'm able to figure out is these researchers have developed an, essentially, digital camera, except unlike a regular digital camera which produces pictures with a uniform density of pixels everywhere, this camera has a ton of extra pixels in the center of the image, giving it a "fovea" like birds of prey. Also, like bird eyes, this "foveated" digital camera can see ultraviolet light, in addition to regular visible light.

If any of you can get around the paywall it would be interesting to find out if the reason it's made with perovskites is to provide this additional ultraviolet detection. The say it's construction is a "vertically stacked perovskite photodetector". This may mean it's not a charge-coupled device (CCD) like regular digital cameras.

This is obviously a research product so no word yet on commercialization, but it seems obvious to me that this has immediate application in military drones.

Avian eye-inspired perovskite artificial vision system for foveated and multispectral imaging

#solidstatelife #computervision #photodetectors #perovskites

More Progress on Perovskite Solar Cells

#science #solarhacks #materialsscience #nanoscale #nanostructure #perovskites #solarcells #solarenergy #hackaday
posted by pod_feeder_v2

More Progress On Perovskite Solar Cells

Perovskites hold enormous promise for generating solar energy, with the potential to provide lighter and cheaper cells than those made from silicon. Unfortunately, the material breaks down too rapi…

Speeding perovskite solar cell development with machine learning

MIT and Stanford researchers are employing artificial intelligence to test perovskites in pursuit of a commercially viable PV cell manufacturing process.
https://pv-magazine-usa.com/2022/04/15/speeding-perovskite-solar-cell-development-with-machine-learning/
#pv, #technology, #mit, #perovskites, #energy, #r&d, #renewable

---

Speeding perovskite solar cell development with machine learning

MIT and Stanford researchers are employing artificial intelligence to test perovskites in pursuit of a commercially viable PV cell manufacturing process.

Perovskites Understood

#science #solarhacks #perovskites #solarcells #solarenergy #hackaday
posted by pod_feeder_v2

Perovskites Understood

The usual solar cell is made of silicon. The better cells use the crystalline form of the element, but there are other methods to obtain electric energy from the sun using silicon. Forming silicon …

Transistors can be made out of perovskites, the material people keep saying will be used for solar cells yet we still never see them anywhere. Anyway, scientists "have found a solution to the perovskite problem, enabling the material to work as a transistor at room temperature. The device has been 'tricked' into ignoring the material's ion content by shunting these electrically charged species away from the gate to a different part of the transistor, where they can't interfere with the flow of current."

"We modified the construction of the transistors instead of modifying the material, resulting in a transistor with an extra, auxiliary gate. Ions are then pushed to the auxiliary gate and fixed in position."

"The auxiliary gate was created by depositing a ferroelectric layer onto the transistor. Ferroelectrics (dielectric materials that show stable polarisation when the external electric field is turned off) can induce a large surface charge that attracts ions and holds them in position, thereby freeing up the gate for the flow of electrons."

The article touts this development as "green" but fails to mention that perovskites are usually made with toxic heavy metals such as lead. I don't think they are really "green" but they are touted as "green" in solar cells because they are so much cheaper than silicon solar panels, which should theoretically lead to them being everywhere. My understanding is that the reason this hasn't happened is because perovskite solar cells wear out quickly while silicon lasts for decades.

Still, as CMOS transistors hit their limits, the world is looking for alternatives to silicon, and it's interesting to know it's possible to make transistors with perovskites. I never would've expected that.

Perovskite: the material that allows a greener fabrication of transistors

#solidstatelife #transistors #perovskites

Better Solvents Could Lead to Cleaner, Greener Perovskite Solar Cells

#news #dmf #gbl #ghbgvl #organic #perovskites #photovoltaic #solar #solvent #toxix #hackaday
posted by pod_feeder_v2

Better Solvents Could Lead To Cleaner, Greener Perovskite Solar Cells

Regardless of appearances, almost all scientific progress comes at a price. That which is hailed as a breakthrough technology that will save the planet or improve the lots of those living upon it a…