How to Increase the defaault size of PE(physical extent) in LVM(logical volume manager)

I have created a LV of 16GB for testing purpose and it has a default PE size of 4mb, I want to increase the default size.How is it possible? What is the command for that.
Also, if there is a way to define the size while creating a LV, then also please help me.
I'm using CentOS 7.

The size is set with the -s option when you vgcreate the volume group, but there is no reason to change it; it will not effect performance.