B Two/three photon absorption chemical substance producing photons for electricity generation

Thread starter Cybersoya
Start date Sep 6, 2025

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The discussion explores the theoretical possibility of creating a chemical substance that can absorb two or three infrared photons and emit one photon suitable for electricity generation in photovoltaic cells. It highlights existing technology that converts heat from molten silicon into visible light for electricity but seeks solutions that operate at lower temperatures. The idea of using an efficient thermoacoustic heat pump to raise ambient temperatures to around 300 degrees Celsius is proposed as a means to generate sufficient infrared photons. The conversation also references "porphyrin derivatives" as a potential class of substances for this application. Overall, the feasibility of producing such a chemical substance remains uncertain and depends on various factors.

Sep 6, 2025

Cybersoya

TL;DR: Electricity from (ambient)heat - molten silicon batteries work that way

I am not a physicist myself, so i ask you for patience.
I am posting my post here, althougt it also covers (useful)heat transfer (out of hot towns) or air-conditionig. At the core of question is quantum physics, is it theoretically possible to produce a chemical substance, which would absorb two or three infrared photons and emit one photon suitable for voltage production in photovoltaic cells. Technology for convertig heat from molten silicon emitting visible light to electricity in photovoltaic cells alreay exists (https://silbat.com/).

But it would have to work at lower temperatures than molten silicon batteries. Maybe efficient thermoacoustic heat pump with no moving parts(except the loudspeaker) could rise the temperature from ambient to some 300 degrees Celsius. Would this produce enough IR photnos to ba captured by chemical substance which would triple their frequency, to be suitable for photovoltaic cells?
It all depends on many variables, but could such cemical substance be produced (i found mentioned class of substances called "porphyrin derivatives". https://en.wikipedia.org/wiki/Two-photon_absorption)?

Thank you for your answers.

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