کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
77498 49283 2016 7 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Chemically, spatially, and temporally resolved 2D mapping study for the role of grain interiors and grain boundaries of organic-inorganic lead halide perovskites
ترجمه فارسی عنوان
از نظر شیمیایی، فضایی، و زمانی حل و فصل دو بعدی مطالعه نقشه برداری برای نقش فضای داخلی دانه و مرز دانه آلی و غیر آلی فراهم آوری سرب هالید
کلمات کلیدی
فراهم آوری,مرز دانه؛ نقشه برداری PL؛ نقشه برداری طول عمر؛ نوترکیبی غیر تابشی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• Grain interiors and grain boundaries of perovskites have been investigated.
• Bandgap broadening at the GBs was formed due to PbIx or CH3NH3PbIx.
• GBs were characterized by no chloride, enriched oxygen, and iodide vacancies.

Grain interiors (GIs) and grain boundaries (GBs) of perovskites have been investigated using chemically, spatially, and temporally resolved measurements. Two dimensional (2D) chemical mapping measurements revealed the GBs consisted of the non-stoichiometric PbIx or CH3NH3PbIx, that were characterized by an absence of chloride, an enriched oxygen concentration, and a high density of iodide vacancies. In addition, steady-state 2D photoluminescence showed the bandgap broadening at the GBs while 2D lifetime mapping measurement suggested that the GBs indeed contained deep defect centers. However, it is found that defective GBs in perovskite materials do not act as high recombination sites for photogenerated charge carriers due to the bandgap broadening of non-stoichiometric PbIx or CH3NH3PbIx perovskites at the GB that forms the potential barriers for photo-generated charge carriers toward the GBs. As a consequence, the photo-generated charge carriers adjacent to the GBs will be easily repelled by the GBs, resulting in a greater reduction of the recombination of photogenerated charge carriers. This is one possible reason for the high performance of CH3HN3PbI3-xClx based solar cells.

Two-dimensional photoluminescence and time resolved lifetime contrasting the grain interiors and grain boundaries.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy Materials and Solar Cells - Volume 155, October 2016, Pages 134–140
نویسندگان
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