The electrolyte is the second key component governing at once the power conversion performances and the stability of dye-sensitized solar cells. Towards the integration of more sustainable materials, we have focused on the replacement of the major constituent of the electrolyte, namely the 1,3-di-alkyl imidazolium iodide. We synthesized two new iodide molecules derived from the natural amino acid L-proline: (S)-2-(methoxycarbonyl)-1,1-dimethylpyrrolidinium iodide (PMeI) and (S)-2-(ethoxycarbonyl)-1,1-ethylpyrrolidinium iodide (PEtI). In combination with the C106 polypyridyl ruthenium(+II) sensitizer, power conversion efficiencies of 7.1% for PMeI and 6.5% for PEtI were obtained under standard Air Mass 1.5G conditions in conjunction with the low-volatile 3-methoxypropionitrile-based solvent. The relationships between these iodide molecules with the power conversion efficiencies and the interfacial charge transfer processes are herein discussed, and the new iodide molecules are systematically compared to the best standard 1,3-di-methylimidazolium iodide.

中文翻译：

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新型基于碘化物的氨基酸分子，可在染料敏化太阳能电池中提供更可持续的电解质

电解质是立即控制功率转换性能和染料敏化太阳能电池稳定性的第二个关键成分。为了整合更具可持续性的材料，我们集中于更换电解质的主要成分，即1,3-二烷基碘化咪唑鎓碘化物。我们合成了两个从天然氨基酸L-脯氨酸衍生的新碘化物分子：( S）-2-（甲氧羰基）-1,1-二甲基吡咯烷碘化物（PMeI）和（S）-2-（乙氧羰基）-1,1-乙基吡咯烷碘化物（PEtI）。与C106聚吡啶钌（+ II）敏化剂，在标准空气质量1.5G条件下，结合低挥发性3-甲氧基丙腈基溶剂，获得的PMeI功率转换效率为7.1％，PEtI的功率转换效率为6.5％。本文讨论了这些碘化物分子与功率转换效率和界面电荷转移过程之间的关系，并将新的碘化物分子与最佳标准的1,3-二甲基咪唑鎓碘化物进行了系统比较。