I agree, a dehydrator with a fan is the only way to go. I always slice the peppers in 1/2 as the skin is a natural barrier to the drying process.
I usually deseed after drying as the seeds have a bitterness to them. some times I crush the dried peppers for flakes, and others I process though a coffee bean grinder to make powder.
I also dry spaghetti sauce in my dehydrator and then powderize it in the coffee bean grinder. I do this for homemade spaghetti sauce for backpacking. it re-hydrates easily this way.