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

Abstract

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.

Dye-sensitized solar cells strike back

“…Specifically, the introduction of an anthracene group between the amine donor and porphyrin (mJS3) resulted in a red shift of both the Soret and Q-band relative to no added anthracene group. 302,303 However, the PCE of mJS3 dropped significantly compared to a benchmark YD2-o-C8 DSC cell under identical conditions (2.3 % versus 9.8 %) primarily due to loss of photocurrent with possible aggregation-limited performance for mJS3. De-aggregating groups at the β positions of the porphyrin were explored in the same study and termed a “double fence” porphyrin due to the use of two de-aggregating aryl groups on each side of the porphyrin (see dye bJS3).…”

Silicon Naphthalocyanine Tetraimides: Cathode Interlayer Materials for Highly Efficient Organic Solar Cells

“…Although excellent CIMs with different structures and properties are desired to meet the requirements of various OSCs, potential candidate chromophores for CIMs are scarce [20–25] . We are interested in phthalocyanine (Pc) and naphthalocyanine (Nc) derivatives, as Pc derivatives and similar porphyrin derivatives with disk π‐conjugated systems have shown excellent performance as active layer materials in OSCs [26–28] . In our previous work, subphthalocyanine triimides (SubPcTIs), subnaphthalocyanine triimides (SubNcTIs), and phthalocyanine tetraimides (PcTIs, structures are shown in Figure S1) with electron‐withdrawing imide groups have been firstly synthesized and used as electron acceptors in OSCs.…”

Stable Dye‐Sensitized Solar Cells Based on Copper(II/I) Redox Mediators Bearing a Pentadentate Ligand

“…[1,2] Dyesensitized solar cells (DSCs) have attracted widespread research attention as one of the most promising nextgeneration solar cell technologies over the past three decades, because of their simplicity of fabrication, aesthetic design characteristics,a nd excellent performance especially for diffuse and low light applications. [3][4][5][6][7][8][9][10][11][12][13][14] In the past few years,copper(II/I) complexes have gained stimulating interest as redox mediators and hole conductors in DSCs,which have enabled high photovoltage of over 1.0 V and astonishing performance under low light conditions. [13][14][15][16][17][18][19][20][21][22][23][24][25] Them ajority of the studies for copper redox mediators has been currently dominated by bidentate ligands,t hat is, pyridine and phenantroline derivatives.…”

“…The ever‐increasing energy demands combined with climate and environmental concerns have motivated our society to find alternative renewable energy sources [1, 2] . Dye‐sensitized solar cells (DSCs) have attracted widespread research attention as one of the most promising next‐generation solar cell technologies over the past three decades, because of their simplicity of fabrication, aesthetic design characteristics, and excellent performance especially for diffuse and low light applications [3–14] …”