Low toxicity environmentally friendly single component aqueous organic ionic conductors for high efficiency photoelectrochemical solar cells†,Journal of Materials Chemistry A

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Low toxicity environmentally friendly single component aqueous organic ionic conductors for high efficiency photoelectrochemical solar cells†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-12-08 00:00:00 , DOI: 10.1039/c7ta09557k
Jayraj V. Vaghasiya _{1,

2,

3} , Dilip Krishna Nandakumar _{1,

2,

3} , Zhang Yaoxin _{1,

2,

3} , Swee Ching Tan _{1,

2,

3}

Affiliation

Photoelectrochemical solar cells have gained impetus over the past two decades owing to several advantages over conventional Si solar cells. The redox capabilities of the electrolyte play a major role in determining the overall photo-conversion efficiency (PCE) of dye sensitized solar cells. In this work we report a novel low toxicity and environmentally friendly aqueous organic ionic conductor (AOIC) for high efficiency DSSCs. This study presents the effect of water on the photocurrent density (J_sc) and stability of DSSCs. Interestingly we have also found that the addition of water to the OICs strongly alters the flat band potential (E_fb) of nano-crystalline TiO₂, hinders the recombination at the TiO₂–AOIC interface and positively shifts the redox potential of I⁻/I₃⁻. Under 1 sun illumination, OICs with 3-methoxypropionitrile solvent and OICs in water show a PCE of 6.02% and 3.57% respectively. This reduced PCE and J–V characteristics are attributed to the negative influence of water on the electron lifetime, electron recombination kinetics and the dark current. Substituting the electron withdrawing group present in the para-position of pyridinium salts mitigates the toxicity and enhances the cationic effect in the electrolyte. The DSSCs fabricated using AOICs showed excellent stability for more than 20 days.

中文翻译：

用于高效光电化学太阳能电池的低毒性，环保型单组分水性有机离子导体†

在过去的二十年中，光电化学太阳能电池由于与传统的硅太阳能电池相比具有许多优势而获得了动力。电解质的氧化还原能力在确定染料敏化太阳能电池的整体光转换效率（PCE）中起着重要作用。在这项工作中，我们报告了一种用于高效DSSC的新型低毒且环保的水性有机离子导体（AOIC）。这项研究提出了水对DSSCs的光电流密度（J _sc）和稳定性的影响。有趣的是，我们还发现，加入的水的强烈的OIC改变平带电位（Ë _FB）纳米晶的TiO ₂，阻碍了在重组在TiO ₂-AOIC接口和正移的我的氧化还原电位^- / I ₃^-。在1个阳光照射下，含3-甲氧基丙腈溶剂的OIC和水中的OIC的PCE分别为6.02％和3.57％。降低的PCE和J – V特性归因于水对电子寿命，电子重组动力学和暗电流的负面影响。取代存在于吡啶鎓盐的对位的吸电子基团减轻了毒性并增强了电解质中的阳离子作用。使用AOIC制成的DSSC在20天内显示出出色的稳定性。

更新日期：2017-12-08

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