Premium
Efficient polymer solar cells utilizing solution‐processed interlayer based on different conjugated backbones
Author(s) -
Shi Yueqin,
Yu Zhanyang,
Li Zhengjun,
Zhao Xiaodong,
Li Xin,
Xu Minxuan,
Zhang Xuefeng,
Zhang Qi
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49527
Subject(s) - cathode , materials science , conjugated system , energy conversion efficiency , polymer solar cell , polymer , benzotriazole , chemical engineering , organic solar cell , amine gas treating , photochemistry , polymer chemistry , optoelectronics , organic chemistry , chemistry , composite material , engineering , metallurgy
The poor energy conversion efficiency for those polymer solar cells (PSCs) creates an obstacle for their commercialization. Inspired by this issue, two cathode interlayers, PBTBTz‐TMAI and PBTzPh‐TMAI based on benzothiadiazole (BT) and benzotriazole (BTz)‐conjugated or benzene (Ph) and BTz‐conjugated alternating units (both exhibits the same tetravalent amine‐end side chain), were synthesized via Suzuki coupling polymerization and trivalent amine‐end ionization. When PBTBTz‐TMAI and PBTzPh‐TMAI were utilized as cathode interlayers in PSCs, the charge‐carrier transfer from active layer to cathode electrode was significantly improved, accompanied by an optimized exciton dissociation efficiency, primarily attributed to the introduction of tetravalent amine groups. Consequently, the device with PBTBTz‐TMAI exhibited power conversion efficiencies (PCEs) = 8.3 and 10.5% for the PTB7:PC 71 BM‐based and PBDB‐T:ITIC‐based PSCs, respectively. In parallel, devices with a PBTzPh‐TMAI cathode interlayer (that were established on the active layers of PTB7:PC 71 BM and PBDB‐T:ITIC) obtained a remarkably superior optoelectric efficiency with PCEs = 8.5 and 10.8%. These findings offer an alternative tactic toward to high efficiency PSCs to meet the increasing energy crisis.