摘要： Hybrid organic-inorganic perovskites are attractive materials for the fabrication of efficient thin film solar cells. In order to make perovskite solar cells (PSCs) suitable for commercialization, stability issue should be addressed properly. In this work, we introduce a new dopant-free organic material, PV2000, as a stable hole transporting layer (HTL) for the fabrication of stable and efficient PSCs. For this purpose, we fabricate planar PSCs using a triple-A cation perovskite composition and replace commonly used 2,2′,7,7′ -Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) HTL by dopant-free PV2000 polymer. Our characterization results disclose that the PV2000 has a great thermal stability, good hole mobility and suitable band alignment that well-matched with the valence band of triple-A cation perovskite. After proper optimization of PV2000 film thickness, we achieve a planar PSC with a maximum power conversion efficiency (PCE) of 18.93%, which is comparable with the spiro-based device (19.62%). Moreover, we further improve the PCE of the PV2000 based device up to 20.5% using a band alignment engineering by deposition thin layer of polyvinylpyrrolidone (PVP) at perovskite/HTL interface. More importantly, we find that the thermal, moisture and operational stabilities of the PSCs with PV2000 HTL are improved drastically as compared to the spiro-based devices, where the PSC with PV2000 retains ~88% of its initial PCE value under continuous illumination for 250 h as compared to the spiro-based one (39%).