Enhanced photovoltaic performance by modulating surface composition in bulk heterojunction polymer solar cells based on PBDTTT-C-T/PC71 BM.
For the blend film of PBDTTT-C-T:PC71 BM, the use of 1,8-diiodooctane as the solvent additive enriches the polymer at the top surface, so that a power conversion efficiency of 9.13% is recorded in the inverted polymer solar cell based on the blend, which is much higher than that of the device with conventional structure.
State Key Laboratory of Polymer, Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China; University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Xia
X
Guo
Maojie
M
Zhang
Wei
W
Ma
Long
L
Ye
Shaoqing
S
Zhang
Shengjian
S
Liu
Harald
H
Ade
Fei
F
Huang
Jianhui
J
Hou
morphology; polymer solar cells; solvent additives; surface composition