TY - JOUR
T1 - Improved Glass Transition Temperature towards Thermal Stability via Thiols Solvent Additive versus DIO in Polymer Solar Cells
AU - Yin, Jingping
AU - Zhou, Weihua
AU - Zhang, Lin
AU - Xie, Yuanpeng
AU - Yu, Zoukangning
AU - Shao, Jun
AU - Ma, Wei
AU - Zeng, Jianrong
AU - Chen, Yiwang
N1 - Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2017/10
Y1 - 2017/10
N2 - The halogen-free solvent additive, 1,4-butanedithiol (BT) has been incorporated into PTB7-Th:PC71BM, leading to higher power conversion efficiency (PCE) value as well as substantially enhanced thermal stability, as compared with the traditional 1,8-diiodooctane (DIO) additive. More importantly, the improved thermal stability after processing with BT contributes to a higher glass transition temperature (Tg) of PTB7-Th, as determined by dynamic mechanical analysis. After thermal annealing at 130 °C in nitrogen atmosphere for 30 min, the PCE of the specimen processed with BT reduces from 9.3% to 7.1%, approaching to 80% of its original value. In contrast, the PCE of specimens processed with DIO seriously depresses from 8.3% to 3.8%. These findings demonstrate that smart utilization of low-boiling-point solvent additive is an effective and practical strategy to overcome thermal instability of organic solar cells via enhancing the Tg of donor polymer.
AB - The halogen-free solvent additive, 1,4-butanedithiol (BT) has been incorporated into PTB7-Th:PC71BM, leading to higher power conversion efficiency (PCE) value as well as substantially enhanced thermal stability, as compared with the traditional 1,8-diiodooctane (DIO) additive. More importantly, the improved thermal stability after processing with BT contributes to a higher glass transition temperature (Tg) of PTB7-Th, as determined by dynamic mechanical analysis. After thermal annealing at 130 °C in nitrogen atmosphere for 30 min, the PCE of the specimen processed with BT reduces from 9.3% to 7.1%, approaching to 80% of its original value. In contrast, the PCE of specimens processed with DIO seriously depresses from 8.3% to 3.8%. These findings demonstrate that smart utilization of low-boiling-point solvent additive is an effective and practical strategy to overcome thermal instability of organic solar cells via enhancing the Tg of donor polymer.
KW - additives
KW - dynamic mechanical analysis
KW - glass transition temperature
KW - polymer solar cells
KW - thermal stability
UR - https://www.scopus.com/pages/publications/85031709753
U2 - 10.1002/marc.201700428
DO - 10.1002/marc.201700428
M3 - 文章
C2 - 28841263
AN - SCOPUS:85031709753
SN - 1022-1336
VL - 38
JO - Macromolecular Rapid Communications
JF - Macromolecular Rapid Communications
IS - 20
M1 - 1700428
ER -