Small molecule solution-processed bulk heterojunction solar cells with inverted structure using porphyrin donor

Utilizing tetraethynyl porphyrin derivative (TE-Por) as a small molecule donor material, we fabricated a small molecule solution-processed bulk heterojunction (BHJ) solar cell with inverted structure, which exhibited 1.6% power conversion efficiency (J(SC) (short-circuit current) = 4.6mA/cm(2), V-OC (open-circuit voltage) = 0.90 V, and FF (fill factor) = 0.39) in the device configuration indium tin oxide/TiOx (titanium sub-oxide)/[6,6]-phenyl-C61-butyric acid methyl ester: TE-Por (5:1)/MoOx (molybdenum sub-oxide)/Au under AM1.5G illumination at 100 mW/cm(2). Without encapsulation, the small molecule solution-processed inverted BHJ solar cell also showed remarkable durability to air, where it kept over 73% of its initial power conversion efficiency after storage for 28 days under ambient atmosphere in the dark. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4773910]