Testing New Concepts in Solar Cells Sensitized with Indoline Dyes—Alkoxysilyl Anchoring Group, Molecular Capping, and Cobalt-Based Electrolyte,The Journal of Physical Chemistry C

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Testing New Concepts in Solar Cells Sensitized with Indoline Dyes—Alkoxysilyl Anchoring Group, Molecular Capping, and Cobalt-Based Electrolyte
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-11-06 , DOI: 10.1021/acs.jpcc.8b06389
Mateusz Gierszewski ₁ , Adam Glinka ₁ , Iwona Grądzka ₁ , Błażej Gierczyk ₂ , Marcin Ziółek ₁

Affiliation

Basic photovoltaic parameters of the cells sensitized with a popular indoline D149 dye, containing the carboxyl anchoring group, were compared with those of the cells sensitized with the dye modified by the addition of the alkoxysilyl anchoring moiety. Desorption measurements of both compounds showed that the time constant of this process was longer for the modified dye. Two types of electrolytes were used, and the long-time stability and open-circuit voltage were significantly improved when the iodide electrolyte was replaced by the cobalt–bipyridine one. The dynamics of electron injection and titania–electrolyte recombination processes that occur in different time scales, from femtoseconds to seconds, were monitored by femtosecond transient absorption and electrochemical impedance spectroscopy. Additionally, the effect of molecular passivation by post-sensitization capping was checked. The cells after molecular capping showed better relative photocurrent and longer lifetime of the excited state, which was explained as resulting from the suppressed self-quenching of the dyes.

中文翻译：

在用吲哚啉染料敏化的太阳能电池中测试新概念-烷氧基甲硅烷基锚定基团，分子封端和钴基电解质

将用含有羧基锚定基团的流行吲哚啉D149染料敏化的电池的基本光伏参数与通过添加烷氧基甲硅烷基锚定部分修饰的染料敏化的电池的基本光伏参数进行了比较。两种化合物的解吸测量表明，对于改性染料，该过程的时间常数更长。使用两种类型的电解质，当用碘化钴-联吡啶代替碘化物电解质时，长期稳定性和开路电压得到了显着改善。通过飞秒瞬态吸收和电化学阻抗谱监测从飞秒到秒的不同时间范围内发生的电子注入和二氧化钛-电解质复合过程的动力学。此外，检查了敏化后加帽对分子钝化的影响。分子封端后的细胞表现出更好的相对光电流和更长的激发态寿命，这可以解释为是由于染料的自猝灭性降低所致。

更新日期：2018-11-06

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