Molecular Optimization Enables over 13% Efficiency in Organic Solar Cells
Wenchao Zhao(Chinese Academy of Sciences), Sunsun Li(Chinese Academy of Sciences), Huifeng Yao(Chinese Academy of Sciences), Shaoqing Zhang(Chinese Academy of Sciences), Yun Zhang(Chinese Academy of Sciences), Bei Yang(Chinese Academy of Sciences), Jianhui Hou(Chinese Academy of Sciences)
Cited by 2,770
Abstract
A new polymer donor (PBDB-T-SF) and a new small molecule acceptor (IT-4F) for fullerene-free organic solar cells (OSCs) were designed and synthesized. The influences of fluorination on the absorption spectra, molecular energy levels, and charge mobilities of the donor and acceptor were systematically studied. The PBDB-T-SF:IT-4F-based OSC device showed a record high efficiency of 13.1%, and an efficiency of over 12% can be obtained with a thickness of 100-200 nm, suggesting the promise of fullerene-free OSCs in practical applications.
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