How can I have a single sided material?

Hello,
I am using standard shader in unity, and that is how the image is appearing (below). I am wondering how can I, using unity or external program like blender, make it a single sided as I want only the back side of my character appearing transparent without its other side appearing.
53054-screen-shot-2015-08-28-at-111931-pm.png

In any .shader file, you can change the Cull property to say Cull Back (or Front, Back, None).