fig11
![Direct Z-scheme photocatalytic systems based on vdW heterostructures for water splitting and CO<sub>2</sub> reduction: fundamentals and recent advances](https://image.oaes.cc/ba04a360-c1e8-4c19-8989-bf9420411ccd/microstructures3076.fig.11.jpg)
Figure 11. Two different stacking configurations are used in the construction of the α-In2Se3/arsenene vdW heterostructures because the α-In2Se3 layer has a different ferroelectric polarisation orientation, where A, B and C belong to Configuration I and D, E and F belong to Configuration II. The spontaneous out-of-plane electrode polarisation P in Configuration II points in the arsenene direction, whereas P in Configuration I points in the opposite direction. (Reproduced with permission[65]. Copyright 2022, Elsevier).