You're probably not going to find an organic way to target carpenter ants. You can spread diatomaceous powder around the house. Insects eat it and they dry up and die. It takes a while. Carpenter ants actually don't eat wood, they burrow in it. So they remove wood and make little trails. They eat aphids and insects - including termite larvae! But they can cause damage after a long time.
They like soft wood. Wood that's wet or stays damp. If you have a whole lot of them, you might also have other issues like termites or leaking or rotting wood some where. They do usually congregate together. You've probably seen this when you lift a board and thousands of them will pour out. You can kill those on site just to target them with any kind of inspect killer. But, like I said, I don't know of any organic repellant that only attacks carpenter ants and not other insects or animals.