We report a new efficient exciton blocking material, tris(2,4,6-trimethyl-3-(pyridin-3-l)phenyl) (3TPYMB), for organic solar cell applications. The introduction of 3TPYMB as an exciton blocking layer instead of well known BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline) results in the significant improvement of short circuit current (Jsc) and open circuit voltage (Voc) in the boron subphthalocyanine (SubPC)/C-60 based organic solar cell devices. As the results, the power conversion efficiency is enhanced by 11.8%. Such improvement with this new exciton blocking layer is mainly attributed to the good electron transportation by deep penetration of Al cathode metal to 3TPYMB layer.