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ADVANCED MATERIALS · 2013 ·Vol. 25 ·期 32 ·4397-4402 · IF 14.829

Broadband Optical Non-linearity Induced by Charge-Transfer Excitons in Type-II CdSe/ZnTe Nanocrystals

Yunlong Liu,Chunfeng Zhang,Huichao Zhang,Rui Wang,Zheng Hua,Xiaoyong Wang,Jiayu Zhang,Min Xiao

Graphical Benefiting from excitonic charge-transfer states, an efficient non-linear optical response is observed in type-II nanocrystals by four-wave mixing when the incident photon energy lies below the bandgaps of constituent semiconductors. The non-linear optical properties in nanocrystals can be manipulated by the band alignment of the core–shell components, which serves as a promising platform to design broadband non-linear optical devices.

研究领域: 纳米光子学 · 材料科学 · 凝聚态物理 · 光学工程 · 半导体物理学

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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS · 2023 ·Vol. 34 ·期 9 ·794 · IF 2.8

3,5-dichlorobenzylamine lead high-performance and stable 2D/3D perovskite solar cells

Li Ji,Xiang Peng,Tan Xinyu,Li Bowen,Zhang Kai,Zhu Ying,Ren Yanqi,Chen Xiaobo

Organic–inorganic lead halide peroxides (OIHPs) have attracted much interest due to their excellent photovoltaic properties, but practical applications are limited by long-term stability and further performance enhancement. Two-dimensional/three-dimensional (2D/3D) heterojunction is a promising strategy to address these issues. Here, short-chain 3,5-dichlorobenzylamine (DBA) with halogen functional groups is introduced to react with excess PbI 2 to form the 2D perovskite layer in mixed perovskite films of Cs 0.05 (FA 0.85 MA 0.15 ) 0.95 Pb(I 0.85 Br 0.15 ) 3 , which passivates surface defects, favours energy band alignment of functional layers and suppresses non-radiative recombination of carriers. As a result, DBA-treated 2D/3D PSCs obtained a champion PCE of 21.54% with an improved open circuit voltage ( V oc ) of 1.171 V. More importantly, the 2D/3D heterojunction can effectively protect the underlying 3D perovskite from moisture ingress. The unencapsulated 2D/3D devices retain 90% of their initial efficiency even after aging at 40 ± 5% RH for 1000 h, while the 3D device retains only 40%.

研究领域: 材料科学 · 光伏技术 · 纳米结构材料 · 表面化学 · 能源材料

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Broadband Optical Non-linearity Induced by Charge-Transfer Excitons in Type-II CdSe/ZnTe Nanocrystals

3,5-dichlorobenzylamine lead high-performance and stable 2D/3D perovskite solar cells