Manipulating the Charge Carriers Through Functionally Bridged Components Advances Low‐Cost Organic Solar Cells with Green Solvent Processing

Author:

Dela Peña Top Archie123ORCID,Ma Ruijie45ORCID,Luo Yongmin1ORCID,Xing Zengshan6,Wei Qi2,Hai Yulong1ORCID,Li Yao1ORCID,Garcia Sheena Anne7ORCID,Yeung King Lun7ORCID,Jia Tao8,Wong Kam Sing6,Yan He3ORCID,Li Gang45ORCID,Li Mingjie25,Wu Jiaying19ORCID

Affiliation:

1. Function Hub Advanced Materials Thrust The Hong Kong University of Science and Technology Nansha 511400 Guangzhou P. R. China

2. Faculty of Science Department of Applied Physics The Hong Kong Polytechnic University Kowloon Hong Kong 999077 P. R. China

3. School of Science Department of Chemistry The Hong Kong University of Science and Technology Kowloon Hong Kong 999077 P. R. China

4. Department of Electrical and Electronic Engineering Research Institute for Smart Energy (RISE) Guangdong‐Hong Kong‐Macao (GHM) Joint Laboratory for Photonic‐Thermal‐Electrical Energy Materials and Devices The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 P. R. China

5. Photonics Research Institute The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 P. R. China

6. School of Science Department of Physics The Hong Kong University of Science and Technology Kowloon Hong Kong 999077 P. R. China

7. School of Engineering Department of Chemical and Biomolecular Engineering The Hong Kong University of Science and Technology Kowloon Hong Kong 999077 P. R. China

8. School of Optoelectronic Engineering Guangdong Polytechnic Normal University Guangzhou 510665 P. R. China

9. School of Engineering Department of Chemical Engineering The Hong Kong University of Science and Technology Kowloon Hong Kong 999077 P. R. China

Abstract

AbstractOrganic solar cell (OSC) development continues to demonstrate impressive device efficiency improvements. However, the materials synthetic simplicity essential to industrialization remains seriously lacking attention, imparting inferior performance records in low‐cost devices. Hence, low bandgap and completely non‐fused electron acceptors (CNFEAs) having simple molecular structures are investigated herein. In contrast to typically explored fused‐ring acceptors with smaller backbone conformational variations, minimizing the interface recombination sites through a greater extent of localized domains is identified as more critical in CNFEAs, leading to remarkable fill factors (FFs) approaching 75%, among the highest currently realized for low‐cost systems. However, this comes with diminishing charge generation efficiency. The general ternary blend optimization strategy modifying the morphology of host components is limited in preserving such remarkably high FFs. To suppress the trade‐off while keeping notable FFs, a new perspective of constructing functionally bridged components based on optical, electronic, and thermodynamic properties is introduced here. Specifically, charge generation is unrestrained from the host acceptor localized domains through the introduction of a “bridge” component while also taking advantage of the configuration to channel polarons toward the efficient transport moieties of the host components. Accordingly, this work incubates understanding‐guided optimizations toward the advancement of more practical devices.

Funder

Guangzhou Municipal Science and Technology Project

Science, Technology and Innovation Commission of Shenzhen Municipality

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Materials Science,Renewable Energy, Sustainability and the Environment

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