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- Title
Ultrafast Carrier Transfer Promoted by Interlayer Coulomb Coupling in 2D/3D Perovskite Heterostructures.
- Authors
Wei, Ke; Jiang, Tian; Xu, Zhongjie; Zhou, Junhu; You, Jie; Tang, Yuxiang; Li, Han; Chen, Runze; Zheng, Xin; Wang, Shanshan; Yin, Ke; Wang, Zhenyu; Wang, Jun; Cheng, Xiangai
- Abstract
Engineering 2D‐structured lead halide perovskites leads to both excellent optoelectronic performance and intriguing photophysics. Here, the underlying mechanisms of exciton interaction and carrier transfer in 2D/3D hybrid perovskites are studied. The investigated perovskites are in the form of self‐assembled microplatelets, which are naturally composed of multiple perovskite phases, with n being 1, 2, 3, or 4 or nanocrystals in bulk phase (n ≈ ∞). Excitonic energy transfer and charge separation between different phases are found to coexist in this hybrid system, which occur at an ultrafast timescale (<100 fs) followed by a relatively slow channel (2–15 ps). The experimental results reveal that this hybrid perovskite naturally forms a series of "heterostructures," with excitons generated in different phases, showing Coulomb interactions across the interface. This interlayer Coulomb coupling should account for the aforementioned ultrafast carrier transfer. This work provides an accurate and thorough explanation for the remarkable charge transfer rate, which is extremely beneficial for their applications in photovoltaic and optoelectronic devices, even with the apparent interfacial scattering, defect trapping, and disorder‐induced exciton localization in 2D/3D hybrid perovskites. Strong interlayer coulomb coupling is found in 2D/3D hybrid perovskites, which paves the way for ultrafast and efficient interlayer carrier tunneling and makes the material resistant to carrier capture or scattering by interfacial defects and disorder. Furthermore, energy and charge transfer are found to be compatible, which can be utilized to realize high‐performance devices for both light‐emitting and light‐harvesting applications.
- Subjects
PEROVSKITE; OPTOELECTRONICS; NANOCRYSTALS; ENERGY transfer; COULOMB potential; PHOTOVOLTAIC cells
- Publication
Laser & Photonics Reviews, 2018, Vol 12, Issue 10, pN.PAG
- ISSN
1863-8880
- Publication type
Article
- DOI
10.1002/lpor.201800128