Wow, , ,i had this video in 1993 and have been searching for it ever since, , ,EPFL now make solid state DSSC at 15% efficiency
EXAMPLE :- One Sun = 75mW/cm2, 1>400nm.
One percent of solar power = 75mW /100% = 0.75
mWs Per Cm2 divided by one percent of sun power = SOLAR CELL EFFICENTCY.
KNEX CELL EFFICENTCY = 13.8mW / 0.75 = 18.4 %
I did that course.
And passed.