I have the following questions regarding solar panels. 1)Why solar panels which use sunlight concentrators gain in efficiency despite they produce larger currents?Usually it`s believed that with increase in current flow efficiency should fall. Example here is a fuel cells. 2)Currently sunlight concentration up to 100 times acheived on solar panels.Usual sunlight gives around 1000 Watts on square meter.100X1000=100 kW.How could solar cells handle such big currents? If they use P-n potential for charge separation shouldn`t we increase voltage to deal with bigger currents?Or electrostatic potential of P-n junction (voltage) could stay the same as before?