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2015 ; 5
(ä): 13657
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Insight into Evolution, Processing and Performance of Multi-length-scale
Structures in Planar Heterojunction Perovskite Solar Cells
#MMPMID26338280
Huang YC
; Tsao CS
; Cho YJ
; Chen KC
; Chiang KM
; Hsiao SY
; Chen CW
; Su CJ
; Jeng US
; Lin HW
Sci Rep
2015[Sep]; 5
(ä): 13657
PMID26338280
show ga
The structural characterization correlated to the processing control of
hierarchical structure of planar heterojunction perovskite layer is still
incomplete due to the limitations of conventional microscopy and X-ray
diffraction. This present study performed the simultaneously grazing-incidence
small-angle scattering and wide-angle scattering (GISAXS/GIWAXS) techniques to
quantitatively probe the hierarchical structure of the planar heterojunction
perovskite solar cells. The result is complementary to the currently microscopic
study. Correlation between the crystallization behavior, crystal orientation,
nano- and meso-scale internal structure and surface morphology of perovskite film
as functions of various processing control parameters is reported for the first
time. The structural transition from the fractal pore network to the surface
fractal can be tuned by the chloride percentage. The GISAXS/GIWAXS measurement
provides the comprehensive understanding of concurrent evolution of the film
morphology and crystallization correlated to the high performance. The result can
provide the insight into formation mechanism and rational synthesis design.