Building a V-SHAPE back with dumbbells?

Hello guys,
I am wondering if you guys could suggest some exercises only with dumbbells that will target the back and could help me achieve a V-SHAPE body in the future.
I attached a picture showing what I mean by a V-SHAPE body.

Any help will be appreciated. http://forum.simplyshredded.com/cached/7e54573c50038479b6e3a9c8d1f5390a.jpg