Mitigating the Undesirable Chemical Reaction between Organic Molecules for Highly Efficient Flexible Organic Photovoltaics,Advanced Science

当前位置： X-MOL 学术 › Adv. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Mitigating the Undesirable Chemical Reaction between Organic Molecules for Highly Efficient Flexible Organic Photovoltaics
Advanced Science ( IF 14.3 ) Pub Date : 2021-05-07 , DOI: 10.1002/advs.202100865
Adi Prasetio _{1,

2} , Muhammad Jahandar ₁ , Soyeon Kim ₁ , Jinhee Heo ₁ , Yong Hyun Kim ₃ , Dong Chan Lim ₁

Affiliation

Organic photovoltaics (OPVs) with nonfullerene acceptors (NFAs) feature excellent device performance and device stability. However, they are facing problems when the amine-rich polyelectrolytes are used as cathode interfacial layers. In this work, a small molecule, ethanedithiol (EDT) at the polyethyleneimine ethoxylated (PEIE)/active layer interface is inserted for mitigating the undesirable reaction between amine-rich groups and electron-acceptor moieties in NFA. The main role of EDT is to passivate the PEIE surface and prevent electron flow to NFA and the unwanted reaction can be mitigated. It improves the performance of OPV devices by reducing the work function, decreasing trap-assisted recombination, and improving electron-mobility. As a result, the flexible device with the PEIE interfacial layer with a power conversion efficiency (PCE) of 7.20% can be improved to 10.11% after the inclusion of EDT. Moreover, EDT-modified device can retain 98.18% after it is bent for 200 cycles and can maintain 80.83% of its initial PCE under continuous light illuminated in ambient conditions without any encapsulation. Based on these findings, the proposed strategy constitutes a crucial step toward highly efficient flexible OPVs.

中文翻译：

减轻有机分子之间不良化学反应，实现高效柔性有机光伏

具有非富勒烯受体（NFA）的有机光伏（OPV）具有出色的器件性能和器件稳定性。然而，当富含胺的聚电解质用作阴极界面层时，它们面临着问题。在这项工作中，在聚乙烯亚胺乙氧基化 (PEIE)/活性层界面插入小分子乙二硫醇 (EDT)，以减轻 NFA 中富含胺基团和电子受体部分之间的不良反应。 EDT 的主要作用是钝化 PEIE 表面并防止电子流向 NFA，从而可以减轻不需要的反应。它通过降低功函数、减少陷阱辅助复合和提高电子迁移率来提高 OPV 器件的性能。结果，具有PEIE界面层的柔性器件的功率转换效率（PCE）为7.20%，在添加EDT后可将其提高至10.11%。此外，经过EDT修饰的器件在弯曲200次循环后仍能保持98.18%的性能，并且在环境条件下连续光照下，无需任何封装，仍能保持其初始PCE的80.83%。基于这些发现，所提出的策略是迈向高效灵活 OPV 的关键一步。

更新日期：2021-05-07

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11