Journal
ACS OMEGA
Volume 2, Issue 5, Pages 2126-2133Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.7b00265
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Funding
- EPSRC [EP/N008065/1, EP/M025020/1, EP/L017563/1]
- EPSRC studentship award via the New and Sustainable Photovoltaics Centre [EP/L01551X/1]
- EPSRC [EP/L017563/1, EP/N008065/1, EP/M025020/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M025020/1, EP/N008065/1, EP/L017563/1] Funding Source: researchfish
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Mixed halide (I/Br) complex organic/inorganic hybrid perovskite materials have attracted much attention recently because of their excellent photovoltaic properties. Although it has been proposed that their stability is linked to the chemical inhomogeneity of I/Br, no direct proof has been offered to date. Here, we report a new method, secondary electron hyperspectral imaging (SEHI), which allows direct imaging of the local variation in Br concentration in mixed halide (I/Br) organic/inorganic hybrid perovskites on a nanometric scale. We confirm the presence of a nonuniform Br distribution with variation in concentration within the grain interiors and boundaries and demonstrate how SEHI in conjunction with low-voltage scanning electron microscopy can enhance the understanding of the fundamental physics and materials science of organic/inorganic hybrid photovoltaics, illustrating its potential for research and development in real-world applications.
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