Effect of Water on the Performance of Dye-Sensitized Solar Cells with Quasi-Solid-State Electrolytes

Nath, Narayan Chandra Deb; Joon, Lee Ho; Lee, Jae‐Joon

doi:10.1166/jnn.2016.13198

Cited by 1 publication

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“…In addition, recently, they reached over 5% PCE, basing on a cobalt bipyridine-pyrazole redox couple in a 100% aqueous solution without any surfactant addition. Another approach that should be mentioned is the application of quasi-solid electrolytes based on water and jellifying agents, which provide remarkable stability of devices without toxicity problems. ,− Nevertheless, construction of high-performing and durable aqueous DSSCs is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

Effects of Aqueous Electrolyte, Active Layer Thickness and Bias Irradiation on Charge Transfer Rates in Solar Cells Sensitized with Top Efficient Carbazole Dyes

2018

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The photovoltaic performance and electron-transfer dynamics from femtoseconds to milliseconds are explored for very efficient carbazole sensitizers applied in solar cells, including the champion dye ADEKA-1. The photocurrent in the novel, environmentally friendly aqueous electrolyte is about 40% of that in the standard acetonitrile one, both based on cobalt complexes as a redox pair. The drop in the photocurrent is found to be correlated with increased electron recombination between sensitized titania particles and dyes, taking place with a time constant of several hundreds of picoseconds. Electron injection and recombination between titania and dye are slowed down under the presence of water (about 10 times) and with additional 1 sun bias irradiation (about 2 times). These effects are interpreted as due to reduced electronic coupling between the electron donors (dyes) and acceptor framework (titania). Moreover, a decrease in the relative photocurrent, photovoltage, and fill factor of the cells with increasing thickness of titania layers are observed. The obtained results should be relevant for the optimization of solar cells with a large class of organic sensitizers, especially when looking for nontoxic configurations and determining true charge transfer rates under operating solar cell conditions.

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