Is there such a thing as a molecular organic alloy?,Materials Horizons

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Is there such a thing as a molecular organic alloy?
Materials Horizons ( IF 12.2 ) Pub Date : 2019-09-10 , DOI: 10.1039/c9mh01351b
Xinjing Huang _{1,

2,

3,

4} , Xiao Liu _{2,

3,

4,

5} , Kan Ding _{2,

3,

4,

6} , Stephen R. Forrest _{1,

2,

3,

4,

5}

Affiliation

In inorganic materials, an alloy is a mixture of two or more substances that generally exhibits electronic and/or physical properties that differ from those of its constituents. In organic systems, the formation of a “molecular alloy” comprising mixtures of molecular organic materials has also been proposed. We test the validity of this concept via the study of the optoelectronic properties of a ternary system that has previously been identified to form a molecular acceptor alloy, namely a blend of a poly(3-hexylthiophene) (P3HT) donor, with two acceptors indene-C₆₀ bisadduct (ICBA) and phenyl-C₆₁-butyric acid methyl ester (PC₆₁BM) [R. A. Street, et al., J. Am. Chem. Soc., 2013, 135, 986–989]. Using photoelectron spectroscopy, we find that the ICBA:PC₆₁BM blend shows the same highest occupied molecular orbital and exciton energies as that of ICBA, indicating the absence of a new exciton state in the blend. Furthermore, charge transfer state spectra of ternary blends are found to comprise a simple linear superposition of the corresponding binaries. From these results, no evidence of new, emergent electronic states is found to support the existence of a molecular alloy in this system. To our knowledge there is as yet no clear evidence of the existence of an alloy in any organic semiconductor system. We discuss the criteria that should be met by a molecular organic alloy and procedures needed for their unambiguous identification.

中文翻译：

有分子有机合金吗？

在无机材料中，合金是两种或多种物质的混合物，这些物质通常表现出不同于其成分的电子和/或物理特性。在有机体系中，还提出了形成包含分子有机材料的混合物的“分子合金”的方法。我们通过研究三元体系的光电性能来测试该概念的有效性，该三元体系先前已被确定形成分子受体合金，即聚（3-己基噻吩）（P3HT）供体与两个受体茚的混合物-C ₆₀双加合物（ICBA）和苯基-C _61-丁酸甲酯（PC ₆₁ BM）[RA Street等，，J。Am。化学 Soc。，2013，135，986-989]。使用光电子能谱，我们发现ICBA：PC ₆₁ BM共混物显示出与ICBA相同的最高占据分子轨道和激子能，表明共混物中不存在新的激子态。此外，发现三元共混物的电荷转移状态光谱包括相应二元的简单线性叠加。从这些结果中，没有发现新的，出现的电子状态的证据支持该系统中分子合金的存在。据我们所知，尚无任何有机半导体系统中存在合金的明确证据。我们讨论了分子有机合金应满足的标准及其明确鉴定所需的程序。

更新日期：2020-01-04

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