Статья

Reducing Trap Density in Organic Solar Cells via Extending the Fused Ring Donor Unit of an A–D–A‐Type Nonfullerene Acceptor for Over 17% Efficiency

Jixiang ZhouState Key Laboratory of Powder Metallurgy Central South University Changsha 410083 P. R. ChinaDan HeCollege of Chemistry and Chemical Engineering Central South University Changsha 410083 P. R. ChinaYawen LiBeijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids and Laboratory of Molecular Nanostructure and Nanotechnology Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. ChinaFei HuangKey Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. ChinaJianqi ZhangCAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 P. R. ChinaCheng ZhangKey Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. ChinaYongbo YuanState Key Laboratory of Powder Metallurgy Central South University Changsha 410083 P. R. ChinaYuze LinBeijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids and Laboratory of Molecular Nanostructure and Nanotechnology Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. ChinaChunru WangBeijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids and Laboratory of Molecular Nanostructure and Nanotechnology Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. ChinaFuwen ZhaoState Key Laboratory of Powder Metallurgy Central South University Changsha 410083 P. R. China

2022en

ABI

Аннотация

Abstract The high trap density (generally 10 16 to 10 18 cm −3 ) in thin films of organic semiconductors is the primary reason for the inferior charge‐carrier mobility and large nonradiative recombination energy loss (Δ E nr ) in organic solar cells (OSCs), limiting improvement in power conversion efficiencies (PCEs). In this study, the trap density in OSCs is efficiently reduced via extending the donor core of nonfullerene acceptors (NFAs) from a heptacyclic unit to a nonacyclic unit. TTPIC‐4F with a nonacyclic unit has stronger intramolecular and intermolecular interactions, affording higher crystallinity in thin films relative to its counterpart BTPIC‐4F. Thus, the D18:TTPIC‐4F‐based device achieves a lower trap density of 4.02 × 10 15 cm −3 , comparable to some typical high‐performance inorganic/hybrid semiconductors, with higher mobility and inhibited charge‐carrier recombination in devices. Therefore, the D18:TTPIC‐4F‐based OSC exhibits an impressive PCE of 17.1% with a low Δ E nr of 0.208 eV, which is the best known value for A–D–A‐type NFAs. Therefore, extending the donor core of NFAs is an efficient method for suppressing trap states in OSCs for high PCEs.

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Идентификаторы

DOI: 10.1002/adma.202207336

Цитирования и источники

Цитирований: 2Использованных источников: 0

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