1：Experimental Design and Method Selection:

The vertical aligned ZnO nanowalls templates were synthesized via a facile solution method. CdS NWs were deposited by a simple chemical bath deposition method.

2：Sample Selection and Data Sources:

CdCl2 and thiourea (H2NCSNH2) were used as precursors for cadmium (Cd) and sulphur (S), respectively. Ammonia (NH3) was used as a complexing agent.

3：List of Experimental Equipment and Materials:

Field emission scanning electron microscopy (FESEM, FEI QAUANTA400), transmission electron microscopy (TEM, JEM-2010). UV–vis diffuse reflectance spectrophotometer (Varian Cary 500) was used to record UV–vis absorption spectra.

4：0). UV–vis diffuse reflectance spectrophotometer (Varian Cary 500) was used to record UV–vis absorption spectra. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The prepared ZnO nanowalls were dipped into the solution and yellow CdS NWs were deposited into the porous structure of ZnO nanowalls after standing for another 20mins. Subsequently, the electrode was rinsed with pure deionized water and allowed to dry at room temperature in ambient air. Finally, the samples were annealed in air at 420 (cid:1) for 1 h.

5：Data Analysis Methods:

The photo resistance response properties were measured and recorded by a CGS-1TP.