Double Fence Porphyrins that are Compatible with Cobalt(II/III) Electrolyte for High‐Efficiency Dye‐Sensitized Solar Cells

A series of new double fence porphyrin dyes bJS1 – bJS3 , with eight long alkoxyl chains attached to four β‐phenyl groups, have been designed and synthesized. The single fence meso ‐substituted counterparts mJS1 – mJS3 were also prepared as reference dyes. Dyes bJS1 – bJS3 and mJS1 – mJS3 exhibit power conversion efficiencies of 8.03–10.69 % and 2.33–6.69 %, respectively. Based on photovoltaic studies, the remarkable cell performance of double fence porphyrin sensitizers can be attributed to reduced dye aggregation and a decreased charge‐recombination rate. Notably, porphyrins bJS2 and bJS3 exhibit better efficiency than the benchmark YD2‐ o ‐C8 (9.83 % in this work), demonstrating that the double fence structure is a promising design strategy for efficient porphyrin sensitizers in high‐performance DSSCs.