High‐Pressure Fabrication of Binary Organic Solar Cells with High Molecular Weight D18 Yields Record 19.65 % Efficiency

Author:

Lu Hao12,Liu Wenlong3,Ran Guangliu4,Liang Zezhou5,Li Hongxiang6,Wei Nan3,Wu Hongbo7,Ma Zaifei7,Liu Yahui2,Zhang Wenkai4,Xu Xinjun3,Bo Zhishan2ORCID

Affiliation:

1. College of Materials Science and Engineering Qingdao University Qingdao 266071 P. R. China

2. College of Textiles & Clothing State Key Laboratory of Bio-fibers and Eco-textiles Qingdao University Qingdao 266071 China

3. Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University Beijing 100875 China

4. Department of Physics and Applied Optics Beijing Area Major Laboratory Beijing Normal University Beijing 100875 China

5. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Photonic Technique for Information Xi'an Jiaotong University Xi'an 710049 P. R. China

6. College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 China

7. Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China

Abstract

AbstractIn this work, inspired by the principles of a pressure cooker, we utilized a high‐pressure method to address the processing challenges associated with high molecular weight polymers. Through this approach, we successfully dissolved high molecular weight D18 in chloroform at 100 °C within a pressure‐tight vial. The increased steam pressure raised the boiling point and dissolving capacity of chloroform, enabling the creation of a hybrid film with superior properties, including more ordered molecular arrangement, increased crystallinity, extended exciton diffusion length, and improved phase morphology. Organic solar cells (OSCs) based on D18 : L8‐BO prepared using this high‐pressure method achieved an outstanding power conversion efficiency of 19.65 %, setting a new record for binary devices to date. Furthermore, this high‐pressure method was successfully applied to fabricate OSCs based on other common systems, leading to significant enhancements in device performance. In summary, this research introduces a universal method for processing high molecular weight D18 materials, ultimately resulting in the highest performance reported for binary organic solar cells.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shandong Province

Publisher

Wiley

Subject

General Medicine

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