Journal
SCIENCE CHINA-MATERIALS
Volume 59, Issue 6, Pages 427-434Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-016-5063-3
Keywords
organic solar cells; non-fullerene electron acceptors; perylene diimide; monomer
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Funding
- National Natural Science Foundation of China [51473009, 51273203]
- Fundamental Research Funds for the Central Universities [YWF-14-HHXY-007, YWF-14-HXXY-014]
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Perylenediimide (PDI)-based materials exhibit great potential as non-fullerene acceptors in bulk-heterojunction (BHJ) organic solar cells (OSCs). Recent investigations have revealed that PDI molecules with a twisted structure could disrupt aggregation of perylene unit. Here, we present a PDI monomer via bay-substitutions with four fused naphthalene units by three-step reactions, named TN-PDI. The introduction of four fused naphthalene rings into the bay positions of PDI unit leads to a strong steric hindrance with a twist angle of 33 degrees between the two PDI subplanes. Blended with a wide-band gap polymer donor (PDBT-T1), the TN-PDI based non-fullerene solar cells show power conversion efficiency (PCE) of 3.0%. Our results indicate that the bay-substitutions with fused aromatic substitutions could be an efficient approach to develop monomeric PDI acceptors.
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