期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 21, 期 39, 页码 21996-22001出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cp04033a
关键词
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资金
- National Natural Science Foundation of China [51772271]
- Natural Science Foundation of Zhejiang Province [LY17A040008]
Solution-processed all-inorganic CsPbX3(X = Br, I, and Cl) perovskites are proven to be promising materials for various optoelectronic applications. However, CsPbX3 films as optical gain media were confronted with unsatisfactory surface coverage and inferior photoluminescence performance when compared with their colloidal nanocrystal counterparts. Herein, we demonstrate a strategy for improving the optical properties via modification of both top and bottom surfaces of CsPbBr3 films. The treated perovskite films show ultra-smooth morphology and a carrier lifetime of 44 ns, more than one order of magnitude longer than the untreated one. Meanwhile, a mixed polymer layer on the top of the perovskite film could combine surface passivation with symmetric waveguide effects, leading to an outstanding net gain coefficient of 694 cm(-1). These merits predict the great potential of all-inorganic perovskite films to support high efficiency charge transport or stimulated emission.
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