Cada foton dos electrones?
el prof. Martí hablava de nanomateriales para el futuro de las celulas.
En este articulo en inglès se explica un nuevo phenomeno que puede portar a nuevas celulas con la ayuda de nanoparticulas.
" The basic operation of solar cells has essentially remained unchanged over the past four decades -- the absorption of a photon by the solar cell material generates a single exciton (a bound state of a negatively charged electron and a positively charged hole), which undergoes charge separation and produces electrical current. Traditionally, the single photon produces only one exciton. The rest of the photon's energy is lost as heat. Over the decades, scientists have proposed various methods for improving the efficiency of solar panels, including a method called carrier multiplication.
Carrier multiplication was discovered in the 1950s, but has always been considered a very inefficient method for solar energy conversion since it produced, at best, an increase in solar energy conversion efficiency of less than 1 percent. Los Alamos scientists have demonstrated that the use of nanoscale semiconductor particles can greatly improve the efficiency of carrier multiplication through a significant enhancement of the effect called impact ionization. Impact ionization is a process where an exciton, created in a semiconductor by absorbing a photon, transfers the excess energy that would normally have been lost as heat to another electron. The result of this energy transfer process is that two excitons are formed for one absorbed photon."
http://www.lanl.gov/worldview/news/releases/archive/04-040.shtml
http://quantumdot.lanl.gov/pages/Research/PbSeNQD.jpg
En este articulo en inglès se explica un nuevo phenomeno que puede portar a nuevas celulas con la ayuda de nanoparticulas.
" The basic operation of solar cells has essentially remained unchanged over the past four decades -- the absorption of a photon by the solar cell material generates a single exciton (a bound state of a negatively charged electron and a positively charged hole), which undergoes charge separation and produces electrical current. Traditionally, the single photon produces only one exciton. The rest of the photon's energy is lost as heat. Over the decades, scientists have proposed various methods for improving the efficiency of solar panels, including a method called carrier multiplication.
Carrier multiplication was discovered in the 1950s, but has always been considered a very inefficient method for solar energy conversion since it produced, at best, an increase in solar energy conversion efficiency of less than 1 percent. Los Alamos scientists have demonstrated that the use of nanoscale semiconductor particles can greatly improve the efficiency of carrier multiplication through a significant enhancement of the effect called impact ionization. Impact ionization is a process where an exciton, created in a semiconductor by absorbing a photon, transfers the excess energy that would normally have been lost as heat to another electron. The result of this energy transfer process is that two excitons are formed for one absorbed photon."
http://www.lanl.gov/worldview/news/releases/archive/04-040.shtml
http://quantumdot.lanl.gov/pages/Research/PbSeNQD.jpg
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