How to save screenshots on Android with Unity and C#?

I'm trying to make it so that when I touch a button on my tablet, it will call the ScreenShot script component connected to the Main Camera. Am I doing this right or am I missing some code?

 public class ScreenShot : MonoBehaviour
 {    
     public static string ScreenShotName(string testbed)
     {
         return string.Format("{0}/Screenshot/{1}-{2}.png", Application.persistentDataPath, testbed, System.DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss"));
     }
 
     public void OnClickSaveImage()
     {
         string name = ScreenShotName("test");
         print(name);
         Debug.Log(name);
         Application.CaptureScreenshot(name);
     }
 }