scholarly journals MOLECULAR-DYNAMIC SIMULATION OF MIXTURES OF MODIFIED FULLERENES AND 1,8-OCTANDITHIOL

Author(s):  
Максим Дмитриевич Малышев ◽  
Shih-Huang Tung ◽  
Павел Вячеславович Комаров

В данной работе мы сообщаем о результатах сравнительного атомистического моделирования двух систем, содержащих функцианализированные фуллерены метилового эфира фенил- C-масляной кислоты (PCBM ) и фенил- C-масляной кислоты (PCBM ) в присутствии растворителя 1,8-октандитиола (ODT). Для реализации расчетов использовался метод молекулярной динамики на базе программного пакета LAMMPS. Зафиксировано принципиальное различие в упаковке молекул PCBM и PCBM . В случае систем с PCBM наблюдается тенденция к постепенному разделению растворителя и фуллеренов. При этом в образцах с PCBM наблюдается тенденция к формированию устойчивых трехмерных сетчатых структур, образованных двумя взаимопроникающими фазами: фуллеренами и молекулами ODT. С целью проверки масштабируемости наблюдаемого структурного упорядочения для смеси PCBM с ODT было выполнено моделирование в ячейке с удвоенным размером ребер. В этом случае мы также наблюдаем формирование биконтинуальных структур из фуллеренов и растворителя. In this work, we report on the results of comparative atomistic modeling of two systems containing functionalized fullerenes of phenyl-C-butyric acid methyl ester (PCBM ) and phenyl- C -butyric acid (PCBM ) in the presence of a high-boiling solvent 1,8 -octanedithiol (ODT). The calculations were performed by full atomistic molecular dynamics with using LAMMPS software package. A fundamental difference in the packaging of PCBM and PCBM molecules was detected. In the case of systems with PCBM , there is a tendency towards gradual separation of the solvent and fullerenes. At the same time, in samples with PCBM , there is a tendency to the formation of stable three-dimensional network structures formed by two interpenetrating phases: fullerenes and ODT molecules. In order to check the scalability of the observed structural ordering for the mixture of PCBM with ODT, an additional simulation was performed in a cell with doubled edge size. In this case, we also observe the formation of bicontinual structures from fullerenes and the solvent.

2020 ◽  
Vol 16 (4) ◽  
pp. 556-567
Author(s):  
Asma Khalil ◽  
Zubair Ahmad ◽  
Farid Touati ◽  
Mohamed Masmoudi

Background: The photo-absorption and light trapping through the different layers of the organic solar cell structures are a growing concern now-a-days as it affects dramatically the overall efficiency of the cells. In fact, selecting the right material combination is a key factor in increasing the efficiency in the layers. In addition to good absorption properties, insertion of nanostructures has been proved in recent researches to affect significantly the light trapping inside the organic solar cell. All these factors are determined to expand the absorption spectrum and tailor it to a wider spectrum. Objective: The purpose of this investigation is to explore the consequence of the incorporation of the Ag nanostructures, with different sizes and structures, on the photo absorption of the organic BHJ thin films. Methods: Through a three-dimensional Maxwell solver software, Lumerical FDTD, a simulation and comparison of the optical absorption of the three famous organic materials blends poly(3- hexylthiophene): phenyl C71 butyric acid methyl ester (P3HT:PCBM), poly[N-9″-heptadecanyl-2,7- carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)]: phenyl C71 butyric acid methyl ester (PCDTBT:PCBM) and poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt- 4,7-(2,1,3-benzothiadiazole)]: phenyl C71 butyric acid methyl ester (PCDPDTBT:PCBM) has been conducted. Furthermore, FDTD simulation study of the incorporation of nanoparticles structures with different sizes, in different locations and concentrations through a bulk heterojunction organic solar cell structure has also been performed. Results: It has been demonstrated that embedding nanostructures in different locations of the cell, specifically in the active layer and the hole transporting layer had a considerable effect of widening the absorption spectrum and increasing the short circuit current. The effect of incorporation the nanostructures in the active layer has been proved to be greater than in the HTL. Furthermore, the comparison results showed that, PCDTBT:PCBM is no more advantageous over P3HT:PCBM and PCPDTBT:PCBM, and P3HT:PCBM took the lead and showed better performance in terms of absorption spectrum and short circuit current value. Conclusion: This work revealed the significant effect of size, location and concentration of the Ag nanostructures while incorporated in the organic solar cell. In fact, embedding nanostructures in the solar cell widen the absorption spectrum and increases the short circuit current, this result has been proven to be significant only when the nanostructures are inserted in the active layer following specific dimensions and structures.


2016 ◽  
Vol 52 (36) ◽  
pp. 6107-6110 ◽  
Author(s):  
Meera Stephen ◽  
Hasina H. Ramanitra ◽  
Hugo Santos Silva ◽  
Simon Dowland ◽  
Didier Bégué ◽  
...  

PCBM is polymerised using the SACAP route to give solution processable thin films and raised LUMOs.


ACS Omega ◽  
2018 ◽  
Vol 3 (8) ◽  
pp. 9369-9377 ◽  
Author(s):  
Ryota Shoji ◽  
Takuya Omori ◽  
Yusuke Wakikawa ◽  
Tomoaki Miura ◽  
Tadaaki Ikoma

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