Mesoporous organic solar cells

The device configuration with mesoporous titanium dioxide (m-TiO2) has garnered considerable attention as a promising solution for high-stable perovskite and dye-sensitized solar cells, although its application in organic solar cells remains unexplored. In this communication, we have incorporated this structure into both bulk-heterojunction (BHJ) and single-component organic solar cells (SCOSCs). Surprisingly, Mesoporous OSCs (M-OSCs) demonstrate a deteriorative efficiency in BHJ-type cells, whereas this configuration succeeds in SCOSCs, exhibiting competitive performance with Planar OSCs (P-OSCs). This pioneering study has resulted in a competitive power conversion efficiency of 9.67% for m-TiO2-based cells, marking a significant milestone in the advancement of OSCs. Importantly, profiting from the better ultraviolet resistance of m-TiO2 than zinc oxide, this M-OSC exhibits superior photostability than that of P-OSCs when subjected to continuous one-sun (AM1.5G) illumination. In its entirety, this research not only introduces the concept of M-OSCs for the first time but also unveils a novel device architecture poised to address the long-term stability concerns within the realm of OSCs.