Tunable transition metal complexes as hole transport materials for stable perovskite solar cells†
Liangyou
Lin, 
*ab
Terry Chien-Jen
Yang,
a
Bo
Chi,
e
Noel W.
Duffy,
c
Jinhua
Li,
b
Henry J.
Snaith
d
and
Gregory J.
Wilson
*a
*ab
Terry Chien-Jen
Yang,
a
Bo
Chi,
e
Noel W.
Duffy,
c
Jinhua
Li,
b
Henry J.
Snaith
d
and
Gregory J.
Wilson
*a
Abstract
Transition metal complexes offer cost-effective alternatives as hole-transport materials (HTMs) in perovskite solar cells. However, the devices suffer from low performance. We boost the power conversion efficiency of devices with transition metal complex HTMs from 2% to above 10% through energy level tuning. We further demonstrate the excellent photostability of the device based on the additive-free HTM.
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