文档介绍：Approach
As is well known, the maximum ther-
modynamic efficiency for the conversion
Solar Cells Based on of unconcentrated solar irradiance into
electrical free energy in the radiative limit,
assuming detailed balance, a single thresh -
old absorber, and thermal equilibrium
Quantum Dots: between electrons and phonons, was cal-
culated by Shockley and Queisser in 19611
to be about 31%. For full solar concentra-
Multiple Exciton tion (46,300 suns), the maximum single -
bandgap efficiency increases to about 41%.
In the Shockley–Queisser analysis, two
major factors limit the conversion effi-
Generation and ciency to 31%: (1) the excess ic energy
of hot photogenerated carriers created by
the absorption of supra- bandgap photons
is lost as heat through phonon emission,
Intermediate Bands and (2) photons less than the bandgap are
not absorbed. The first approach to third-
generation solar cells discussed here
Antonio Luque, Antonio Martí, addresses the first factor in the Shockley–
Queisser analysis (thermalization loss of
and Arthur J. Nozik hot electrons), whereas the second ap-
proach addresses the second factor (loss of
sub- bandgap photons).
Abstract Multiple- Exciton- Generation
Semiconductor quantum dots may be used in so- called third- generation solar cells Solar Cells
that have the potential to greatly increase the p