用于具有深 HOMO 能级的聚合物供体的溶液可加工氧化镍空穴传输层,Advanced Materials Interfaces

当前位置： X-MOL 学术 › Adv. Mater. Interfaces › 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.)

用于具有深 HOMO 能级的聚合物供体的溶液可加工氧化镍空穴传输层
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2022-08-28 , DOI: 10.1002/admi.202201274
Hong Nhan Tran ₁ , Heunjeong Lee ₁ , Chan Beom Park ₂ , Narra Vamsi Krishna ₂ , Febrian Tri Adhi Wibowo ₂ , Sung‐Yeon Jang ₂ , Jin Young Kim ₂ , Shinuk Cho ₁

Affiliation

非富勒烯有机太阳能电池（OSC）的光敏层通常由低带隙受体和具有深最高占据分子轨道（HOMO）的共轭聚合物组成，因为空穴从受体转移到供体以及电子从供体聚合物到受体的转移对于获得更好的性能非常重要。因此，需要供体聚合物的HOMO与空穴传输层的功函数（WF）之间的能级匹配。由于本征 p 型 NiO 具有较低的 WF 值，因此基于 NiO 的 PBDB-T-2F:Y6 OSC 的效率受到一定程度的抑制。在这项工作中，通过使用 4-(三氟甲基)苯甲酸 (PTF-BOA) 偶极层 (NiO- PTF-BOA) 被成功淘汰。₃基团吸引电子，因此在CF ₃侧产生部分负电荷。该 PTF-BOA 偶极层诱导真空能级上移，从而将 NiO-PTF-BOA 的功函数提高到 5.5 eV。具有 NiO-PTF-BOA 的 PBDB-T-2F:Y6 OSC 的效率为 16.36%，这是报道的基于 NiO 的 OSC 的最高效率。

"点击查看英文标题和摘要"

Solution-Processable Nickel Oxide Hole Transport Layer for a Polymer Donor with a Deep HOMO Level

The photoactive layer of non-fullerene organic solar cells (OSCs) generally consists of a low band-gap acceptor and conjugated polymer with a deep highest occupied molecular orbital (HOMO) because the hole transfer from the acceptor to the donor as well as the electron transfer from the donor polymer to the acceptor is very important to achieve better performance. Therefore, energy level matching between the HOMO of the donor polymer and the work-function (WF) of the hole transport layer is required. Since the intrinsic p-type NiO has a lower WF value, the efficiency of NiO-based PBDB-T-2F:Y6 OSCs is somewhat suppressed. In this work, the energy barrier between the NiO (5.1 eV) and HOMO of PBDB-T-2F (5.6 eV) by modifying the NiO surface using a 4-(trifluoromethyl)benzoic acid (PTF-BOA) dipole layer (NiO-PTF-BOA) is successfully eliminated. The carboxyl group of PTF-BOA is bonded with Ni atoms on the NiO surface, while the CF₃ group attracts electrons, thus resulting in a partial negative charge on the CF₃ side. This PTF-BOA dipole layer induces the vacuum level upshift thus enhancing the work function of NiO-PTF-BOA to 5.5 eV. The PBDB-T-2F:Y6 OSCs with NiO-PTF-BOA exhibit an efficiency of 16.36%, which is the highest reported efficiency for NiO-based OSCs.

更新日期：2022-08-28

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南