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2-(trimethylsilyloxy)-l,3-butadiene reacted with fullerenes via sing-step Diels-Alder reaction to give cyclohexanone containing fullerene mono-adduct, abbreviated as CHOC₆₀ with purity as high as 99% through much more simplified synthesis and purification process compared with PC₆₁BM, as electron acceptor for organic solar cells (OSCs). After easy reduction and esterification, CHOC₆₀ could be further modified into cyclohexyl acetate functionalized fullerene mono-adduct, named as CHAC₆₀ with excellent solubility in common organic solvents, such as chloroform, toluene and 1,2-dichlorobenzene etc. P3HT-based bulkheterojunction photovoltaic devices were fabricated by using CHOC₆₀ and CHAC₆₀ as the electron acceptors through a layered structure of ITO/PEDOT:PSS/P3HT:acceptor/Ca/Al. Composite ratios of P3HT and the fullerene derivatives were varied such as 1:0.5, 1:1 and 1:1.5. The device performances of these OSCs are determined by the open-circuit voltage (V_oc), short-circuit current density (J_sc), and fill factor (FF). After optimization, the highest PCE of the devices fabricated using CHOC₆₀ and CHAC₆₀ were 2.97% and 3.15%, respectively, which significantly reduced the manufacturing cost by consuming much less fullerene acceptor and exhibited comparative photovoltaic performances with PC₆₁BM.