Figure 3

The measured electrical current–voltage (I–V) characteristics from the NWs. a I–V curves of three p–n NWs and a p–i(unimplanted) NW. Please refer to Table 1 for details of the NWs.Inset of Fig. 3a shows the I–V curve of the substrate in the same voltage range. b Semi-log plot of the I–V curves in Fig. 3a. For extracting the ideality factors of the p–n junctions, the linear regions of the curves of the p–n NWs in forward bias (−0.2 to −0.6 volt) were used