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2018 ; 9
(1
): 1076
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Surface passivation engineering strategy to fully-inorganic cubic CsPbI(3)
perovskites for high-performance solar cells
#MMPMID29540764
Li B
; Zhang Y
; Fu L
; Yu T
; Zhou S
; Zhang L
; Yin L
Nat Commun
2018[Mar]; 9
(1
): 1076
PMID29540764
show ga
Owing to inevitable thermal/moisture instability for organic-inorganic hybrid
perovskites, pure inorganic perovskite cesium lead halides with both inherent
stability and prominent photovoltaic performance have become research hotspots as
a promising candidate for commercial perovskite solar cells. However, it is still
a serious challenge to synthesize desired cubic cesium lead iodides (CsPbI(3))
with superior photovoltaic performance for its thermodynamically metastable
characteristics. Herein, polymer poly-vinylpyrrolidone (PVP)-induced surface
passivation engineering is reported to synthesize extra-long-term stable cubic
CsPbI(3). It is revealed that acylamino groups of PVP induce electron cloud
density enhancement on the surface of CsPbI(3), thus lowering surface energy,
conducive to stabilize cubic CsPbI(3) even in micrometer scale. The
cubic-CsPbI(3) PSCs exhibit extra-long carrier diffusion length (over 1.5??m),
highest power conversion efficiency of 10.74% and excellent thermal/moisture
stability. This result provides important progress towards understanding of phase
stability in realization of large-scale preparations of efficient and stable
inorganic PSCs.