Fluorination of the Quinoxaline-Based p-Type Polymer and n-Type Small Molecule for High VOC Organic Solar Cells

被引:26
作者
Ji, Hongru [1 ,2 ]
Li, Jianfeng [2 ]
Du, Mengzhen [3 ]
Yang, Jing [4 ]
Tang, Ailing [2 ]
Li, Gongqiang [1 ]
Guo, Qiang [3 ]
Zhou, Erjun [2 ]
机构
[1] Nanjing Tech Univ, Inst Adv Mat, Nanjing 211816, Peoples R China
[2] Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Nanosyst & Hierarch Fabricat, Beijing 100190, Peoples R China
[3] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China
[4] Inst Sci & Technol, China Three Gorges Corp, Beijing 100038, Peoples R China
基金
中国国家自然科学基金;
关键词
PERFORMANCE; ACCEPTOR; PHOTOVOLTAICS; IMPROVE; COST; GAP;
D O I
10.1021/acs.jpcc.1c01967
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The "Same-A-Strategy" (SAS) employing the same acceptor unit (A) to construct both donor and acceptor materials was effective to achieve high open-circuit voltage (V-OC) but only confined to the benzotriazole (BTA) unit. In this work, we chose quinoxaline (Qx) instead of BTA as the A unit to construct photovoltaic materials and extended the application of the SAS. By introducing the fluorine atom to the thiophene side chains of the p-type polymer and Qx units of the n-type small molecule, the optoelectronic properties can be effectively fine-tuned. The photovoltaic device based on PE61:Qx3b achieved a power conversion efficiency (PCE) of 8.24% with a V-OC of 1.02 V. After fluorination of the n-type material, the PE61:F-Qx3b-based device achieved an improved PCE of 10.45% with a medium V-OC of 0.98 V owing to the stronger pi-pi stacking, more matched energy levels, and suppressed bimolecular recombination. Further fluorination of the p-type material, the PE62:F-Qx3b-based device obtained a V-OC as high as 1.09 V while achieving a slightly high PCE at 9.78% based on the Qx unit with a very high V-OC. These four devices maintain a high V-OC around 1.0 V with a low energy loss from 0.57 to 0.71 eV. Our results indicate that the Qx unit is also appropriate for the SAS to attain high-voltage solar cells, and fluorination is helpful to promise performance.
引用
收藏
页码:10876 / 10882
页数:7
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