Performance enhancement of block-copolymer solar cells through tapering the donor–acceptor interface: A multiscale study
Performance enhancement of block-copolymer solar cells through tapering the donor–acceptor interface: A multiscale study
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DOI：
10.1016/j.polymer.2014.01.052
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发表时间：
2014-03
期刊：
影响因子：
4.6
通讯作者：
A. Pershin;Sergii Donets;S. A. Baeurle
中科院分区：
文献类型：
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作者：
A. Pershin;Sergii Donets;S. A. Baeurle
锥形嵌段共聚物提供了一个令人兴奋的机会，通过保存它们的相分离的介观结构，使具有所需的空间动力学性能的聚合物系统的生成定制不同组分之间的界面区域。在这里，我们探索它们的有用性，优化聚合物体异质结的光伏性能。为此，我们应用最近开发的基于粒子的多尺度太阳能电池算法，并研究在电子供体-（D）和电子受体-（A）嵌段之间的化学连接处的随机锥形化对各种层状聚芴嵌段共聚物系统的光伏性能的影响。我们的模拟结果表明，引入一个锥形的中间块与最佳的长度导致激子解离效率的显着增加，但只适度恶化的电荷传输效率。这导致通过将太阳能电池的活性层的厚度在DA界面的方向上从10 nm增加到50 nm，内部量子效率从25%增加到39%。
Tapered block copolymers offer an exciting opportunity to tailor the interfacial region between different components by conserving their phase-separated mesoscale structure, which enable the generation of polymer systems with the desired spatio-dynamic properties. Here, we explore their usefulness for optimizing the photovoltaic performance of polymer bulk heterojunctions. To this end, we apply a recently developed particle-based multiscale solar-cell algorithm and investigate the effect of random tapering at the chemical junctions between the electron-donor- (D) and electron-acceptor- (A) blocks on the photovoltaic properties of various lamellar-like polyfluorene-based block-copolymer systems. Our simulation results reveal that introducing a tapered middle block with optimal length leads to a significant increase of the exciton dissociation efficiency, but deteriorates the charge transport efficiency only moderately. This results in a gain of the internal quantum efficiency from 25 up to 39% by increasing the thickness of the active layer of the solar cell from 10 up to 50 nm in direction to the DA interface.