Impact of the solubility of organic semiconductors for solution-processable electronics on the structure formation: a real-time study of morphology and electrical properties,Soft Matter

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Impact of the solubility of organic semiconductors for solution-processable electronics on the structure formation: a real-time study of morphology and electrical properties
Soft Matter ( IF 2.9 ) Pub Date : 2018-03-08 00:00:00 , DOI: 10.1039/c7sm02408h
E. S. Radchenko _{1,

2,

3,

4,

5} , D. V. Anokhin _{1,

2,

3,

4,

5} , K. L. Gerasimov _{1,

2,

3,

4,

5} , A. I. Rodygin _{1,

2,

3,

4,

5} , A. A. Rychkov _{1,

2,

3,

4,

5} , E. D. Shabratova _{1,

2,

3} , S. Grigorian _{6,

7,

8,

9} , D. A. Ivanov _{1,

2,

3,

4,

5}

Affiliation

The control of structure formation in the active layers of organic solar cells allows for improvement in their processability and enhancement of the efficiency of the final devices. In the present work, in situ studies of film formation from binary toluene solutions of an electron donor, poly(3-hexylthiophene) (P3HT), and an electron acceptor such as [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) or indene-C₆₀ bisadduct (ICBA) have been conducted. These experiments were carried out using GIWAXS with simultaneous electric current measurements. The comparative analysis of the intensity of the amorphous halo, and the 100 and 020 peaks of P3HT reveals the development of the semicrystalline morphology of the donor through a partly-ordered phase. The experiments show the impact of the chemical structure of the acceptor, as well as that of the donor : acceptor ratio on the kinetics of drying and crystallization. The optimal bulk heterojunction morphology was achieved for P3HT : ICBA 1 : 1, which exhibited the highest value of current. A more efficient phase separation in non-annealed P3HT:ICBA films as compared to P3HT:PCBM was accounted for by the differences in solubility of the components in toluene. The structure formation during solvent evaporation can be subdivided into three stages, including the ordering of the polymer in solution, phase separation during precipitation, and the perfectioning of P3HT crystals in the dry film.

中文翻译：

可溶液处理电子产品的有机半导体溶解度对结构形成的影响：形态和电学性质的实时研究

通过控制有机太阳能电池的有源层中的结构形成，可以改善其可加工性并提高最终器件的效率。在本工作中，原位研究电子供体，聚（3-己基噻吩）（P3HT）和电子受体，例如[6,6]-苯基-C-61-丁酸的二甲苯溶液成膜甲酯（PCBM）或茚-C ₆₀进行了双加合物（ICBA）。这些实验是使用GIWAXS进行的，同时进行电流测量。对无定形晕的强度以及P3HT的100和020峰的强度的比较分析表明，供体的半结晶形态通过部分有序相得以发展。实验表明受体的化学结构以及供体：受体比例对干燥和结晶动力学的影响。对于P3HT：ICBA 1：1，获得了最佳的本体异质结形态，其表现出最高的电流值。与P3HT：PCBM相比，未退火的P3HT：ICBA膜中的相分离效率更高，这是由于组分在甲苯中溶解度的差异所致。

更新日期：2018-03-08

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