Figure 4.

IVcharacteristics of the sandwiched Si-ncs/P3HT bulk-heterojunction in the dark and under illumination at AM1.5 after annealing at 140 °C. TheIVcharacteristics were taken from the blend sandwiched on solid nonporous substrate (a) and within TiO2nanotube arrays with the diameters of 50 nm (b) and 90 nm (c), respectively. TheIVcharacteristics of pure polymer are shown for comparison

Švrček et al. Nanoscale Research Letters 2009 4:1389-1394   doi:10.1007/s11671-009-9410-y