Organolead　halide　perovskite　solar　cells　(PSC)　are　arising　as　promising　candidates　for　next-generation　renewable　energy　conversion　devices.　Currently,　inverted　PSCs　typically　employ　expensive　organic　semiconductor　as　electron　transport　material　and　thermally　deposited　metal　as　cathode　(such　as　Ag,　Au,　or　Al),　which　are　incompatible　with　their　large-scale　production.　Moreover,　the　use　of　metal　cathode　also　limits　the　long-term　device　stability　under　normal　operation　conditions.　Herein,　a　novel　inverted　PSC　employs　a　SnO2-coated　carbon　nanotube　(SnO2@CSCNT)　film　as　cathode　in　both　rigid　and　flexible　substrates　(substrate/NiO-perovskite/Al2O3-perovskite/SnO2@CSCNT-perovskite).　Inverted　PSCs　with　SnO2@CSCNT　cathode　exhibit　considerable　enhancement　in　photovoltaic　performance　in　comparison　with　the　devices　without　SnO2　coating　owing　to　the　significantly　reduced　charge　recombination.　As　a　result,　a　power　conversion　efficiency　of　14.3%　can　be　obtained　on　rigid　substrates　while　the　flexible　ones　achieve　10.5%　efficiency.　More　importantly,　SnO2@CSCNT-based　inverted　PSCs　exhibit　significantly　improved　stability　compared　to　the　standard　inverted　devices　made　with　silver　cathode,　retaining　over　88%　of　their　original　efficiencies　after　550　h　of　full　light　soaking　or　thermal　stress.　The　results　indicate　that　SnO2@CSCNT　is　a　promising　cathode　material　for　long-term　device　operation　and　pave　the　way　toward　realistic　commercialization　of　flexible　PSCs.