The Effect of H‐ and J‐Aggregation on the Photophysical and Photovoltaic Properties of Small Thiophene–Pyridine–DPP Molecules for Bulk‐Heterojunction Solar Cells,Advanced Functional Materials

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The Effect of H‐ and J‐Aggregation on the Photophysical and Photovoltaic Properties of Small Thiophene–Pyridine–DPP Molecules for Bulk‐Heterojunction Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-03-10 , DOI: 10.1002/adfm.201605779
Miriam Más-Montoya ₁ , René A. J. Janssen _{1,

2}

Affiliation

The performance of organic semiconductors in optoelectronic devices depends on the functional properties of the individual molecules and their mutual orientations when they are in the solid state. The effect of H‐ and J‐aggregation on the photophysical properties and photovoltaic behavior of four electronically identical but structurally different thiophene–pyridine–diketopyrrolopyrrole molecules is studied. By introducing and changing the position of two hexyl side chains on the two peripheral thiophene units of these molecules, their aggregation in thin films between H‐type and J‐type is effectively tuned, as evidenced from the characteristics of optical absorption, fluorescence, and excited state lifetime. The two derivatives that assemble into J‐type aggregates exhibit a significantly enhanced photovoltaic performance, up to an order of magnitude, compared to the two molecules that form H‐type aggregates. The reasons for this remarkably different behavior are discussed.

中文翻译：

H-和J-聚集对本体-异质结太阳能电池中小噻吩-吡啶-DPP分子的光物理和光伏特性的影响

光电子器件中有机半导体的性能取决于单个分子的功能特性及其在固态时的相互取向。研究了H和J聚集对四个电子相同但结构不同的噻吩-吡啶-二酮吡咯并吡咯分子的光物理性质和光伏行为的影响。通过在这些分子的两个外围噻吩单元上引入和改变两个己基侧链的位置，可以有效地调节它们在H型和J型之间的薄膜中的聚集，这从光吸收，荧光和激发态寿命。组装成J型聚集体的两种衍生物显示出显着增强的光伏性能，与形成H型聚集体的两个分子相比，最多可达到一个数量级。讨论了这种行为显着不同的原因。

更新日期：2017-03-10

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