I have been trying to achieve this effect, and I have a client that possibly wants something like this on a shoot this weekend. Thing is I never get it quite right. I am looking to have the background fully exposed and the subject as a silhouette.
Yes I agree with George, that should do it. Funny how what is generally considered a "mistake" can be exactly right for some situations and for some clients. So expose for the background and let the foreground go dark but not totally black so that you can still make out some basic shapes. Fine tuning in your editing program will probably be the way to get just the right mix.
Here's an old joke: Shooting out of focus or with a bad exposure once is a mistake, three times and it's a style!