10.1021/acsami.7b00510.s001
Qianqian Sun
Qianqian
Sun
Fujun Zhang
Fujun
Zhang
Qiaoshi An
Qiaoshi
An
Miao Zhang
Miao
Zhang
Xiaoling Ma
Xiaoling
Ma
Jian Zhang
Jian
Zhang
Simultaneously
Enhanced Efficiency and Stability of
Polymer Solar Cells by Employing Solvent Additive and Upside-down
Drying Method
American Chemical Society
2017
PTB 7-Th 71 BM
stability
PC 71 BM molecules
power conversion efficiency
glass Petri dish
PCE
Polymer Solar Cells
method
PSC
Employing Solvent Additive
upside-down
Upside-down Drying Method
phase separation
PBDT-TS
transmission electron microscopy
incidence X-ray diffraction
polymer
PffBT 4T 71 BM
X-ray photoelectron spectroscopy
2017-02-23 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Simultaneously_Enhanced_Efficiency_and_Stability_of_Polymer_Solar_Cells_by_Employing_Solvent_Additive_and_Upside-down_Drying_Method/4718929
The morphology of
active layer plays an important role in determining
the power conversion efficiency (PCE) and stability of polymer solar
cells (PSCs), which strongly depend on the dynamic drying process
of active layer. In this work, an efficient and universal method was
developed to let active layer undergo upside-down drying process in
a covered glass Petri dish. For the PSCs based on PTB7-Th:PC<sub>71</sub>BM, the champion PCEs were improved from 8.58% to 9.64% by mixing
3 vol % 1,8-di-iodooctane and further to 10.30% by employing upside-down
drying method. The enhanced PCEs of PSCs with active layers undergoing
upside-down drying process are mainly attributed to the optimized
vertical phase separation, the more ordered and tightly packed π–π
stacking of polymer molecules. Meanwhile, PC<sub>71</sub>BM molecules
can be frozen in more ordered and tightly packed π–π
stacking polymer network, which lead to the enhanced stability of
PSCs. The universality of upside-down drying method can be solidly
confirmed from PSCs with PTB7:PC<sub>71</sub>BM, PffBT4T-2OD:PC<sub>71</sub>BM, or PBDT-TS1:PC<sub>71</sub>BM as active layers, respectively.
The molecular packing and phase separation of blend films with different
solvent additives and drying methods were investigated by grazing
incidence X-ray diffraction, transmission electron microscopy, and
X-ray photoelectron spectroscopy.