Details

Autor(en) / Beteiligte

• Lu, Yang
• Yu, Zi‐Di
• Zhang, Run‐Zhi
• Yao, Ze‐Fan
• You, Hao‐Yang
• Jiang, Li
• Un, Hio‐Ieng
• Dong, Bo‐Wei
• Xiong, Miao
• Wang, Jie‐Yu
• Pei, Jian

Titel

Rigid Coplanar Polymers for Stable n‐Type Polymer Thermoelectrics

Ist Teil von

• Angewandte Chemie International Edition, 2019-08, Vol.58 (33), p.11390-11394

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Low n‐doping efficiency and inferior stability restrict the thermoelectric performance of n‐type conjugated polymers, making their performance lag far behind of their p‐type counterparts. Reported here are two rigid coplanar poly(p‐phenylene vinylene) (PPV) derivatives, LPPV‐1 and LPPV‐2, which show nearly torsion‐free backbones. The fused electron‐deficient rigid structures endow the derivatives with less conformational disorder and low‐lying lowest unoccupied molecular orbital (LUMO) levels, down to −4.49 eV. After doping, two polymers exhibited high n‐doping efficiency and significantly improved air stability. LPPV‐1 exhibited a high conductivity of up to 1.1 S cm−1 and a power factor as high as 1.96 μW m−1 K−2. Importantly, the power factor of the doped LPPV‐1 thick film degraded only 2 % after 7 day exposure to air. This work demonstrates a new strategy for designing conjugated polymers, with planar backbones and low LUMO levels, towards high‐performance and potentially air‐stable n‐type polymer thermoelectrics. Stability: A new rigid coplanar poly(p‐phenylene vinylene) (PPV) derivative, LPPV‐1, is synthesized with a rigid planar backbone and low‐lying LUMO, which lead to reduced conformational disorder and high n‐type doping efficiency. The conductivity of LPPV‐1 is up to 1.1 S cm−1, and the power factor is only 2 % after a 7 day exposure to air. This work represents an effective strategy towards high‐performance and potentially air‐stable n‐type polymer thermoelectrics.