Discovery of organic-inorganic hybrid perovskites ignites the dream of next-generation solar cells fabricated by low-cost solution processing. To date, fullerene derivative [6,6]-phenyl-C₆₁- butyric acid methyl ester (PC₆₁BM), is the most prevalently used electron transport material (ETM) for high efficiency inverted planar heterojunction (PHJ) perovskite solar cells. Compared with PC₆₁BM, pristine fullerenes, such as C₆₀ and C₇₀, have shown superiority of higher electron mobility and much lower costs. Due to the poor solubility and strong tendency to crystallize for pristine fullerenes in solution process, it is still a challenge to deposit compact and continuous film of pristine fullerenes for inverted PHJ perovskite solar cells by solution processing. Herein, solution processed pristine fullerenes (C₆₀ and C₇₀) were used as ETMs to replace PC₆₁BM in inverted PHJ perovskite solar cells with high performance and enhanced stability. Power conversion efficiency of 14.04% was obtained by using mixture of C₆₀ and C₇₀ as ETM, which is comparable to that of PC₆₁BM-involving device (13.74%). We demonstrated that the strong tendency of pristine fullerenes to crystallize on solvent removal can be largely mitigated by mixing different kinds of pristine fullerenes, with implication about a promising future of pristine fullerenes as ETMs for high performance perovskite solar cells.