Here are a few options:

• Spray the plants with soapy water every few days, especially on the underside of the leaves.  One tablespoon of dish soap or castile soap per gallon of water is enough.
• Spray with dish soap plus cayenne pepper and/or neem oil.  Neem oil sprays are available at most garden centers.
• Knock them off by hand or a hose and remove the older leaves.
• Put beneficial insects like ladybugs or green lacewings on the plants.
• Grow companion plants like marigolds, garlic, and catnip with the pepper plants.

There’s lots of information online about aphid control.  Here’s a good article that specifically talks about peppers.

Here’s a more detailed article about aphids and aphid control.

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