"使具有感光性" can be translated into English as "to render photosensitive" or "to make photosensitive".
For example:
This chemical treatment renders the material photosensitive. （这种化学处理使材料具有感光性。）
We need to make the film photosensitive for photography. （我们需要使胶片具有感光性以用于摄影。）