Crystal formation involving 1-methylbenzimidazole in iodide/triiodide electrolytes for dye-sensitized solar cells |
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| Authors: | Andreas Fischer Henrik Pettersson Anders Hagfeldt Gerrit Boschloo Lars Kloo Mikhail Gorlov |
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| Affiliation: | aCenter of Molecular Devices, Department of Chemistry, Royal Institute of Technology (KTH), S-100 44 Stockholm, Sweden;bIVF Industrial Research and Development Corporation, S-431 53 Mölndal, Sweden |
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| Abstract: | Nitrogen heterocyclic compounds, such as N-methylbenzimidazole (MBI), are commonly used as additives to electrolytes for dye-sensitized solar cells (DSCs), but the chemical transformation of additives in electrolyte solutions remains poorly understood. Solid crystalline compound (MBI)6(MBI-H+)2(I−)(I3−) (1) was isolated from different electrolytes for DSCs containing MBI as additive. The crystal structure of 1 was determined by single-crystal X-ray diffraction. In the crystal structure, 1 contains neutral and protonated MBI fragments; iodide and triiodide anions form infinite chains along the crystallographic a-axis. The role of the solvent and additives in the crystallization process in electrolytes is discussed. |
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| Keywords: | Solar cell Electrolyte Additive Crystal structure |
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