We have demonstrated through a
very wide and strong quantum efficiency spectra that
the configured nanotube solar cells can effectively
enhance carrier generation and collection. In preliminary
experiments, the nanotube CdS-CdTe solar
cells, with no additional antireflection coating, exhibited
a short current density of 25.5 mA/cm2, an open-circuit
voltage of 750 mV, and a power conversion efficiency
of 10.7% under 1-sun illumination.