Engineered exciton diffusion length enhances device efficiency in small molecule photovoltaics†,Journal of Materials Chemistry A

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Engineered exciton diffusion length enhances device efficiency in small molecule photovoltaics†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-04-19 00:00:00 , DOI: 10.1039/c8ta01226a
Muhammad T. Sajjad _{1,

2,

3,

4} , Oskar Blaszczyk _{1,

2,

3,

4} , Lethy Krishnan Jagadamma _{1,

2,

3,

4} , Thomas J. Roland _{1,

2,

3,

4} , Mithun Chowdhury _{1,

2,

3,

4} , Arvydas Ruseckas _{1,

2,

3,

4} , Ifor D. W. Samuel _{1,

2,

3,

4}

Affiliation

In organic photovoltaic blends, there is a trade-off between exciton harvesting and charge extraction because of the short exciton diffusion length. Developing a way of increasing exciton diffusion length would overcome this trade-off by enabling efficient light harvesting from large domains. In this work, we engineered (enhanced) both exciton diffusion length and domain size using solvent vapour annealing (SVA). We show that SVA can give a three-fold enhancement in exciton diffusion coefficient (D) and nearly a doubling of exciton diffusion length. It also increases the domain size, leading to enhancement of charge extraction efficiency from 63 to 89%. Usually larger domains would reduce exciton harvesting but this is overcome by the large increase in exciton diffusion, leading to a 20% enhancement in device efficiency.

中文翻译：

工程激子扩散长度可提高小分子光伏电池的器件效率†

在有机光伏混合物中，由于激子扩散长度短，因此在激子收获和电荷提取之间需要权衡。开发一种增加激子扩散长度的方法将通过允许从大范围有效地收集光来克服这种折衷。在这项工作中，我们使用溶剂蒸汽退火（SVA）设计（增强）了激子扩散长度和畴尺寸。我们证明SVA可以使激子扩散系数（D）提高三倍），激子扩散长度几乎增加了一倍。它还增加了域的大小，从而使电荷提取效率从63％提高到89％。通常，较大的域会减少激子的收获，但是激子扩散的大幅度增加可以克服这一点，从而使器件效率提高20％。

更新日期：2018-04-19

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