Figure 5

a Schematic diagram of the same cell as in Fig. 4 after H3PO4 etching. Local Al shunts are removed. b The corresponding dark I–V curve showing rectifying behaviour and a large shunt resistance (Rsh = 2 × 105 Ω)
a Schematic diagram of the same cell as in Fig. 4 after H3PO4 etching. Local Al shunts are removed. b The corresponding dark I–V curve showing rectifying behaviour and a large shunt resistance (Rsh = 2 × 105 Ω)