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BBCNEWS The Engineers June 4, 2024 01:38:00

Vehicles off the road. wow, that is pretty, pretty impressive. henry, look, i want to turn back to solar for a second. perovskite is the material you ve been working on. what is it, how does it work, and why is it such an improvement and such a possibility for the revolution of solar power? perovskite is a crystal structure. one of the unique aspects of them is because they re composed of three different irons, we can actually change the composition of these irons and that changes the optical properties and electronic properties of this material. this means instead of using a single material to absorb the sunlight, we can actually tune the perovskite to absorb in different regions and stack these materials on top of each other. now, this stacking of solar cells on top of each other we call multi junctions, and the simplest mult junction is a tandem cell, two solar cells on top of each other. and the perovskite we tune to match perfectly silicon. it absorbs only the visible light and we ....

Henry Snaith , Working On , Solar Power , Crystal Structure , Each Other , Solar Cells , Multi Junctions , Mult Junction ,

BBCNEWS The Engineers June 4, 2024 01:35:00

From the material. now, in terms of the limitations, if we look at the optimum efficiency a single solar absorbent material could be, like silicon, they top out at about 25%. that s really the practical limit for an actual solar panel with today s silicon technology. so, i m hearing 6%, 7%, 8% from danielle. i m hearing 20% from you. we re not quite at that 85%. and all of this energy we generate needs storing, doesn t it? so, kristian, i know that you re a man of the fjords and boats and ships have been a constant thread throughout your life, even before you became a marine engineer. so, 90% of the world s trade travels by sea, as well as 3% of the world s greenhouse gases, it s estimated nearly half a million people die prematurely every year from the air pollution created by ships. your company created the world s first fully electric ship, a battery operated ferry which has travelled the equivalent of eight times around the equator since it was launched in 2015. but what are the ch ....

Kinetic Energy , Solar Absorbent Material , Needs Storing , Solar Panel , Silicon Technology , Doesn T , Kristian Eikeland Holmefjord , Marine Engineer , Air Pollution , Greenhouse Gases , A Million ,

BBCNEWS The Engineers June 4, 2024 01:34:00

Solar panels use silicon. can you explain how that technology works, and what its limitations are in helping us reach the goal danielle just outlined? so, silicon is a semiconductor. that s the material that s used to absorb sunlight and generate electricity in a solar cell. it works by absorbing sunlight, particles of sunlight, that we call photons, they carry energy, they re absorbed in the silicon and what they do is give electrons in that silicon extra kinetic energy, the energy from the photons transferred to the electrons, and those electrons, with that energy, can move around and they re freed from the lattice they re freed from being bound and localised. and that s the current, in essence, those moving electrons, that if we contact the silicon on either side we can extract in an external circuit and generate current and voltage ....

Solar Panels , Technology Works , Kinetic Energy ,

BBCNEWS The Engineers June 4, 2024 01:39:00

Two solar cells on top of each other. and the perovskite we tune to match perfectly silicon. it absorbs only the visible light and we left the silicon absorb all the infrared. and in doing that we actually fundamentally improve the efficiencies. if we made a perfect perovskite on silicon tandem cell, that would top out at about 45%. so we ve fundamentally lifted the ceiling. and if we went one step further to anotherjunction, triple junction, three junctions, that would top out at just above 50%. so what perovskite does is lift the ceiling for potential efficiency and gives us a new path forward to go to higher and higher efficiency. so, i mean, substantial gains in efficiency here. how close is this really to being a real technology? is this now, or this is far flung future? this is very near term. ....

Each Other , Triple Junction ,

BBCNEWS The Engineers June 4, 2024 05:39:00

Multi junctions, and the simplest mult junction is a tandem cell, two solar cells on top of each other. and the perovskite we tune to match perfectly silicon. it absorbs only the visible light and we left the silicon absorb all the infrared. and in doing that we actually fundamentally improve the efficiencies. if we made a perfect perovskite on silicon tandem cell, that would top out at about 45%. so we ve fundamentally lifted the ceiling. and if we went one step further to anotherjunction, triple junction, three junctions, that would top out at just above 50%. so what perovskite does is lift the ceiling for potential efficiency and gives us a new path forward to go to higher and higher efficiency. so, i mean, substantial gains in efficiency here. how close is this really to being a real technology? is this now, or this is far flung future? this is very near term. you can t go out today and buy perovskite solar cells, ....

Each Other , Multi Junctions , Mult Junction , Triple Junction , T Go Out ,