Solar cells are a promising source of renewable energy. However, current cells are limited by their high cost of production and relatively low efficiencies. Perovskite solar cells show promise to overcome these obstacles. Perovskite solar cells are organic-inorganic hybrid devices and are the most rapidly developing type of solar cell, which quickly evolved from efficiencies of near 3% up to 22.1% in just over a half a decade. Fullerene derivatives are the most efficient electron transport layers used in perovskite solar cells due to their exceptional electrochemical properties. PCBM is one of the most widely used derivatives, having an ideal LUMO energy level to accept electrons from the perovskite. PCBM derived dimers have a similar LUMO energy level and exhibit improved charge mobility. The dimer of interest in this work was formed by linking two molecules of PCBA with one molecule of 2,2-diethyl-1,3-propanediol via two consecutive Fisher esterification reactions. With this PCBM derivative dimer as the electron transport material, the efficiency of perovskite solar cells can reach 13.7%.