Solar cell system

A solar cell system comprising:

• a plurality of P-N junction cells comprising M number of P-N junction cells, M being equal to or greater than 2, the plurality of P-N junction cells being arranged from a first P-N junction cell to a Mth P-N junction cell along a straight line and electrically connected to each other in series;
• an inner electrode between adjacent two of the plurality of P-N junction cells, a number of the inner electrode being M−1, at least one of the inner electrode comprising an array of carbon nanotubes comprising a plurality of carbon nanotubes;
• a first collecting electrode on an outside surface of the first P-N junction cell;
• a second collecting electrode on an outside surface of the Mth P-N junction cell;
• and
• a photoreceptive surface configured to directly receive incident light beams, the photoreceptive surface being parallel to the straight line.