solar cells and integration of nanotechnology organic/inorganic solar cells silicon solar cells are...
TRANSCRIPT
Solar Cells and Integration of Nanotechnology
• Organic/Inorganic solar cells• Silicon solar cells are most common
and efficient right now.• Reflection of incoming light is a big
natural limitation for efficiency.
Konarka
Evergreen Solar, Inc. Marlboro, MA
Top side metallization grid
Sunlight
0.5 µm
n+ emitte
r
Average phosphorus~1018cm-3
~100-300 µm
Boron~1016cm-3
p base
Optional p+ back surface diffusionBack side metalliza
tion
Typical P-N Junction Silicon Solar Cell Structure
REFLECTION!
Anti-reflection coating
Pattern Transfer by Etching (Tunable Anti-Reflective Coating)
J. Vac. Sci. Technol. B 20.6., Nov. Dec 2002
UMASS
Can work as an anti-reflective coating!
Single Cell
Vout~0.5 Volts
Cut cells connected in series
Vout~3 Volts
Single Cell vs. Cut Cells
Electrical Measurements
Maximum power rectangle
VocVmax
Imax
Isc
FF VmaxImaxIscVoc
Dist.
I V I.V