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

Hao Lu; Wenlong Liu; Guangliu Ran; Zezhou Liang; Hongxiang Li; Nan Wei; Hongbo Wu; Zaifei Ma; Yahui Liu; Wenkai Zhang; Xinjun Xu; Zhishan Bo

doi:10.1002/anie.202314420

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

Angew Chem Int Ed Engl. 2023 Dec 11;62(50):e202314420. doi: 10.1002/anie.202314420. Epub 2023 Nov 10.

Authors

Hao Lu^{1

2}, Wenlong Liu³, Guangliu Ran⁴, Zezhou Liang⁵, Hongxiang Li⁶, Nan Wei³, Hongbo Wu⁷, Zaifei Ma⁷, Yahui Liu², Wenkai Zhang⁴, Xinjun Xu³, Zhishan Bo²

Affiliations

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.

PMID: 37881111
DOI: 10.1002/anie.202314420

Abstract

In 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.

Keywords: Binary; High Molecular Weight; High Pressure; Solar Cells; Solubility.

Abstract

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