Figure 5From: Efficiency improvement of InGaP/GaAs/Ge solar cells by hydrothermal-deposited ZnO nanotube structureI-V characteristics of T-J solar cells and External quantum efficiency. (a) Photovoltaic I-V characteristics of T-J solar cell with and without Si3N4and ZnO nanotube structure, respectively. (b) External quantum efficiency of bare triple-junction (T-J) solar cell and T-J solar cell with SiN4 and ZnO nanotube coating, respectively.Back to article page