Perovskite　solar　cells　have　made　significant　strides　in　recent　years.　However,　there　are　still　challenges　in　terms　of　photoelectric　conversion　efficiency　and　long-term　stability　associated　with　perovskite　solar　cells.　The　presence　of　defects　in　perovskite　materials　is　one　of　the　important　influencing　factors　leading　to　subpar　film　quality.　Adopting　additives　to　passivate　defects　within　perovskite　materials　is　an　effective　approach.　Therefore,　we　first　discuss　the　types　of　defects　that　occur　in　perovskite　materials　and　the　mechanisms　of　their　effect　on　performance.　Then,　several　types　of　additives　used　in　perovskite　solar　cells　are　discussed,　including　ionic　compounds,　organic　molecules,　polymers,　etc.　This　review　provides　guidance　for　the　future　development　of　more　sustainable　and　effective　additives　to　improve　the　performance　of　solar　cells.