Influence of Ionic Liquid Electrolytes on the Photovoltaic Performance of Dye‐Sensitized Solar Cells

Abstract

New binary ionic liquid electrolytes based on 1‐methyl‐1‐butylpyrrolidinium bis(trifluromethylsulfonyl)imide, 1‐butylpyridinium bis(trifluromethylsulfonyl)imide, 1‐methyl‐3‐ethylimidazolium bis(trifluromethylsulfonyl)imide, 1‐methyl‐3‐ethylimidazolium tetracyanoborate, or 1‐methyl‐3‐ethylimidazolium tricyanomethanide coupled with 1‐methyl‐3‐propyl‐imidazolium iodide were developed for dye‐sensitized solar cells (DSCs). We examined these ionic liquid compositions in conjunction in conjunction with a diketopyrrolopyrrole‐based donor‐π bridge acceptor dye (DPP‐13) in dye‐sensitized solar cells and also investigated the influence of adding lithium ions to the electrolyte to enhance the device performance. The best device exhibited a short‐circuit current density of 15.2 mA cm−2, an open‐circuit voltage of 678 mV, and a fill factor of 71 %, corresponding to an overall power conversion efficiency (PCE) of 7.1 % under standard AM 1.5G illumination at 100 mW cm−2.

Photovoltaic Performance of Porphyrin‐Based Dye‐Sensitized Solar Cells with Binary Ionic Liquid Electrolytes

“…The lower viscosity of the E1 electrolyte compared with E4 clearly reflected in higher J SC and PCE values of DSC device J than those of device G. Similar trend was observed in the reported DPP13 dye‐based DSC devices with these two electrolytes . It is interesting to note the influence of cations of IL on DSC device performances.…”

“…The viscosities of the electrolytes E1–E5 are 85, 108, 203, 216, and 780 cP, respectively. In these formulated binary IL electrolytes, the triiodide diffusion coefficients are 5.4 × 10 −7 , 2.7 × 10 −7 , 2.9 × 10 −7 , 3.1 × 10 −7 , and 2.2 × 10 −7 cm 2 s −1 , respectively . The viscosity of the electrolytes decreases in the order of E5 > E4 > E3 > E2 > E1 which is reflected by an increase in the triiodide diffusion coefficients, E1 > E2 > E3 > E4 > E5, respectively.…”

“…It is interesting to note that even though the V OC is higher for the Y350 dye‐based devices compared with DPP13 dye‐based devices, the PCE of Y350‐based device is relatively lower due to lower short‐circuit photocurrent density ( J SC ) values . The higher J SC of the DPP13 devices is due to its broad spectral response compared with Y350 dye, but it requires lithium ions in the electrolyte to enhance electron injection efficiency due to its lower lowest unoccupied molecular orbital level …”

“…We previously investigated the application of IL electrolytes with a blue dye (DPP13), which is from the diketopyrrolopyrrole family, in DSCs . In the building integration PV (BIPV), it is highly demanding to find various color solar cells.…”

Interface Modification by Ionic Liquid: A Promising Candidate for Indoor Light Harvesting and Stability Improvement of Planar Perovskite Solar Cells

“…[3][4][5] In addition to the tailoring role of the energy levels, the upper interfacial film can also act as a significant protecting layer for the perovskite layer. [28][29][30][31][32][33] examples, some ILs with unique physicochemical properties have been utilized as the interfacial layers in organic solar cells and PSCs. For example, bathocuproine (BCP) is commonly used as an upper buffer layer in the inverted planar PSCs.…”