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2017 ; 7
(ä): 46193
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Triple-cation mixed-halide perovskites: towards efficient, annealing-free and
air-stable solar cells enabled by Pb(SCN)(2) additive
#MMPMID28383061
Sun Y
; Peng J
; Chen Y
; Yao Y
; Liang Z
Sci Rep
2017[Apr]; 7
(ä): 46193
PMID28383061
show ga
Organo-metal halide perovskites have suffered undesirably from structural and
thermal instabilities. Moreover, thermal annealing is often indispensable to the
crystallization of perovskites and removal of residual solvents, which is
unsuitable for scalable fabrication of flexible solar modules. Herein, we
demonstrate the non-thermal annealing fabrication of a novel type of air-stable
triple-cation mixed-halide perovskites, FA(0.7)MA(0.2)Cs(0.1)Pb(I(5/6)Br(1/6))(3)
(FMC) by incorporation of Pb(SCN)(2) additive. It is found that adding Pb(SCN)(2)
functions the same as thermal annealing process by not only improving the
crystallinity and optical absorption of perovskites, but also hindering the
formation of morphological defects and non-radiative recombination. Furthermore,
such Pb(SCN)(2)-treated FMC unannealed films present micrometer-sized crystal
grains and remarkably high moisture stability. Planar solar cells built upon
these unannealed films exhibit a high PCE of 14.09% with significantly suppressed
hysteresis phenomenon compared to those of thermal annealing. The corresponding
room-temperature fabricated flexible solar cell shows an impressive PCE of
10.55%. This work offers a new avenue to low-temperature fabrication of
air-stable, flexible and high-efficiency perovskite solar cells.