TY  - JOUR
A1  - Zhang, Shanshan
A1  - Stolterfoht, Martin
A1  - Armin, Ardalan
A1  - Lin, Qianqian
A1  - Zu, Fengshuo
A1  - Sobus, Jan
A1  - Jin, Hui
A1  - Koch, Norbert
A1  - Meredith, Paul
A1  - Burn, Paul L.
A1  - Neher, Dieter
T1  - Interface Engineering of Solution-Processed Hybrid Organohalide Perovskite Solar Cells
JF  - ACS applied materials & interfaces
N2  - Engineering the interface between the perovskite absorber and the charge-transporting layers has become an important method for improving the charge extraction and open-circuit voltage (V-OC) of hybrid perovskite solar cells. Conjugated polymers are particularly suited to form the hole-transporting layer, but their hydrophobicity renders it difficult to solution-process the perovskite absorber on top. Herein, oxygen plasma treatment is introduced as a simple means to change the surface energy and work function of hydrophobic polymer interlayers for use as p-contacts in perovskite solar cells. We find that upon oxygen plasma treatment, the hydrophobic surfaces of different prototypical p-type polymers became sufficiently hydrophilic to enable subsequent perovskite junction processing. In addition, the oxygen plasma treatment also increased the ionization potential of the polymer such that it became closer to the valance band energy of the perovskite. It was also found that the oxygen plasma treatment could increase the electrical conductivity of the p-type polymers, facilitating more efficient charge extraction. On the basis of this concept, inverted MAPbI(3) perovskite devices with different oxygen plasma-treated polymers such as P3HT, P3OT, polyTPD, or PTAA were fabricated with power conversion efficiencies of up to 19%.
KW  - organohalide lead perovskites
KW  - solar cells
KW  - surface wetting
KW  - work function
KW  - oxygen plasma
KW  - transport layer
Y1  - 2018
U6  - https://doi.org/10.1021/acsami.8b02503
SN  - 1944-8244
VL  - 10
IS  - 25
SP  - 21681
EP  - 21687
PB  - American Chemical Society
CY  - Washington
ER  -