Photovoltaic effect for narrow-gap Mott Insulators - Florida Energy ...

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What is wrong with a band semiconductorThe excess energy E beyond the <strong>gap</strong>of the higher energy photons iswasted into heat via phonon emissionor electron-phonon scattering andwithin 10 -12 secs the created electronsor holes relax in their band edges.

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kd*2 cos( )1E t k a1/WThe value of Z is calculated usingthe strong U limit of Hubbardi.e, the t-J modelTake V=U=1 eV, t=1/4For these valueJ/t=4t/U=1 and W=0.96 t, Z=0.53i.e. W=0.24 eV =0.9x10 15 sec -1which is much larger than decayvia phonon emission or phononscattering.

Page 4: The Mott insulatorHˆ t c c U nˆ
Page 9: As a perturbative process
Page 13 and 14: Photovoltaic effect in wide-bandnar
Page 15 and 16: Narrow-gap Wide-band Mott insulator
Page 17 and 18: Equilibrium stateT e is the cell’
Page 19 and 20: Fully concentrated sunlightFully co
Page 21 and 22: Optical conductivityand optical gap
Page 23 and 24: We are focusing our attention to th

Photovoltaic effect for narrow-gap Mott Insulators - Florida Energy ...

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