Page 27 - RSE - Results of the Apollon Project
P. 27
Results of the APolloN PRoject ANd coNceNtRAtiNg PhotovoltAic PeRsPective
FiguRE 17. Optimization of cSi CPV solar cells processes for enhancing the Spectral Response for > 600 nm
y
Narec Cz Starts (1) ENEA Fz Starts (1)
s s
Narec Saw damage + texture ENEA Saw damage + texture
s s
ENEA RCA ENEA RCA
s s
ENEA light doping (3) ENEA light doping (3)
s s
Narec Laser groove + Etch (4) Narec Laser groove + Etch (4)
s s
s s s s
Narec groove dope ENEA groove dope (5) Narec groove dope ENEA groove dope (5)
s s s s
Narec Alu dep s s Narec Alu dep s s
s Narec Alu dep ENEA Alu dep s Narec Alu dep ENEA Alu dep
Narec Metalisation s s Narec Metalisation s s
s Narec Metalisation ENEA Metalisation s Narec Metalisation ENEA Metalisation
Narec isolation s s Narec isolation s s
Narec isolation ENEA isolation Narec isolation ENEA isolation
New solar cell modelling tools have been developed to optimize the solar cell effciency value in concentration.
Since Sic CPV solar cells have a small area, amounting to even some cm , current densities are so high that the
2
voltage drop related to the lateral path of the current along the emitter region and the metal grid have to be taken
into due account by proper 2D-3D modelling. 2-D and 3-D design tools available at Naples University (ATLAS by
Silvaco and Medici and Sentaurus by Synopsys) were implemented by ENEA in order to optimize the solar cell
structure and geometry under different concentration factor (1, 30, 100 X) and sun spectrum values (AM 1.5 D and
25
AM 1.5 Filtered >600 nm) .
y
FiguRE 18. (a) Comparison among 1-D, 2-D, 3-D cSi solar cell modelling and their ftting to experimental data;
(b) Optimization of emitter junction depth and fnger spacing for three different concentration regimes, considering
the fltered AM1.5 solar spectrum ( > 600 nm)
y
a) b)
25 Design strategies for solar cells devised to the low wavelengths portion of the solar spectrum S. Daliento, O.Tari , L. Lancellotti, F. Roca, K. C. Heasman,
L. M. Brown 26 EPVSEC 5-8 September 2011, Hamburg Germany.
th
26
