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- Title
Low-Temperature Crystallized and Flexible 1D/3D Perovskite Heterostructure with Robust Flexibility and High EQE-Bandwidth Product.
- Authors
Qu, Wei; Li, Weijun; Feng, Xiaopeng; He, Yuhong; Pan, Wanting; Guo, KeKe; Li, Mingbian; Tan, Mingrui; Yang, Bai; Wei, Haotong
- Abstract
All-inorganic perovskite cesium lead triiodide [CsPbI3] has attracted much attention among the perovskite family due to its excellent optoelectronic properties and chemical stability. However, the high-temperature crystallization process makes CsPbI3 less compatible with commercially flexible substrates, limiting its application into flexible optoelectronics. Here, a cation of 1-[3-aminopropyl]-2pyrrolidinone [APP] is reported that can form 1D [APP]PbI3 perovskite as templates, and significantly reduce the CsPbI3 black-phase transition energy with a low annealing temperature of 75 °C, which further enables a flexible [APP]PbI3/j-CsPbI3 [1D/3D] heterostructure photodetector on ITO/ PET substrate. A high external quantum efficiency [EQE] greater than 2377% is observed along the orientated 1D/3D heterostructure. The high gain and low noise result in a high specific detectivity [D*] over 1012 Jones under -0.6 V low bias. The optimized device structure brings a high EQE χ bandwidth product of 119 kHz under a low driving bias. Due to the high toughness of orientated APP+ ions and the face-connected [PbI3]- chains structure as a strong energy absorber, the flexible photodetector also shows excellent phase stability and impressive flexibility, remaining >90% initial responsivity after over 20 000 times bending with potential flexible imaging application in harsh environments.
- Subjects
PEROVSKITE; QUANTUM efficiency; CHEMICAL properties; CHEMICAL stability; LEAD
- Publication
Advanced Functional Materials, 2023, Vol 33, Issue 12, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202213955