2017
DOI: 10.1021/acsami.7b10643
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Partially Reversible Photoinduced Chemical Changes in a Mixed-Ion Perovskite Material for Solar Cells

Abstract: Metal halide perovskites have emerged as materials of high interest for solar energy-to-electricity conversion, and in particular, the use of mixed-ion structures has led to high power conversion efficiencies and improved stability. For this reason, it is important to develop means to obtain atomic level understanding of the photoinduced behavior of these materials including processes such as photoinduced phase separation and ion migration. In this paper, we implement a new methodology combining visible laser … Show more

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Cited by 74 publications
(92 citation statements)
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References 40 publications
(81 reference statements)
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“…The signal for Pb, on the other hand, is higher in the exposed region compared to the surrounding regions (Figure 1b 4 ). At first this may seem counter‐intuitive, however consistent with the EDX images of I and C, the increase of the Pb signal just denotes an increase of the concentration of Pb with respect to the other elements, I and C. Whether this is due to the concomitant formation of I 2 and Pb 0[ 29 ] or collapse of the tetragonal structure into PbI 2 due to the removal of MA + and I − , [ 30 ] goes beyond the aim of this work. Indeed, the reduced concentration of I and C in the illuminated region can further enhance the Pb signal in EDX imaging because it reduces the reabsorption of Pb‐emitted X‐rays by MA + and I − .…”
Section: Resultssupporting
confidence: 60%
“…The signal for Pb, on the other hand, is higher in the exposed region compared to the surrounding regions (Figure 1b 4 ). At first this may seem counter‐intuitive, however consistent with the EDX images of I and C, the increase of the Pb signal just denotes an increase of the concentration of Pb with respect to the other elements, I and C. Whether this is due to the concomitant formation of I 2 and Pb 0[ 29 ] or collapse of the tetragonal structure into PbI 2 due to the removal of MA + and I − , [ 30 ] goes beyond the aim of this work. Indeed, the reduced concentration of I and C in the illuminated region can further enhance the Pb signal in EDX imaging because it reduces the reabsorption of Pb‐emitted X‐rays by MA + and I − .…”
Section: Resultssupporting
confidence: 60%
“…These and other like examples [64][65][66][67][68] show that, in addition to halide photosegregation into I-rich and Br-rich domains, other ongoing chemistries occur in the perovskite due to the presence of mobile anions. These chemistries and, most notably, I --related ones, are not contained within existing models for light-induced halide segregation.…”
Section: Photoinduced Loss Of I -mentioning
confidence: 64%
“…While alloying with I − can intuitively be an effective approach to shift the emission to the target window, the incorporation of I − is found to lower the photoluminescence (PL) QY. And HPs with mixed halides suffer from easy phase separation during long‐term operation . What's even worse, the anion exchange reaction is nonquantitative, which usually causes a large degree of PL shift (>10 nm) rather than a delicate tuning.…”
Section: Introductionmentioning
confidence: 99%