Silicon heterojunction solar cell

Panasonic high efficiency solar cell is unique in structure.
The crystalline silicon substrate is sandwhiched by the ultra-thin layers of amorphous silicon.
This amorphous silicon layer reduces the electrons lost on the surface resulting in high efficiency.



Amorphous layer

i-type amorphous layer

n-type crystalline silicon

i-type amorphous layer

Amorphous layer

Transparent electrode (TCO)

These amophous silicon layers
reduces the recombination of
electrons to minimum level.

Ultra-thin amorphas silicon layer


Bifacial cell design

Heterojunction solar cell has a bifacial structure.
The cell even utilize the sunlight reflected back from the rear side material.


Special Black Sheet


Black Sheet

High performance at high temperature

Unlike conventional solar panels
that suffer a radical drop in power generation efficiency at elevated surface temperature,
HIT maintains high efficiency even at high temperature.

PV system output during one day

Stress-controlled tab connetion

Typical tab interconnecting process is a soldering [temperature 800℃],
but we believe the high thermal stress could degrade the reliability of cell in longrun.
By reviewing process and material from the scratch,
we created an original interconnecting process which only requires less than 1/3 of temperature to ensure highest level reliability.


Busbar electrode

Finger electrode



Panasonic’s low temperature tabbing process
minimizes stresses on tab and keeps high durability against changes in temperature