3 years ago

Constructing Mie-Scattering Porous Interface-Fused Perovskite Films to Synergistically Boost Light Harvesting and Carrier Transport

Constructing Mie-Scattering Porous Interface-Fused Perovskite Films to Synergistically Boost Light Harvesting and Carrier Transport
Leimeng Xu, Jianhai Li, Qingsong Shan, Haibo Zeng, Yuhui Dong, Jizhong Song, Jie Xue, Yu Gu, Yousheng Zou
Light harvesting (LH) and carrier transport abilities of a photoactive layer, which are both crucial for optoelectronic devices such as solar cells and photodetectors (PDs), are typically hard to be synergistically improved. Taking perovskite as an example, a freeze-drying recrystallization method is used to construct porous films with improvements of both LH and carrier transport ability. During the freeze-drying casting process, the rapid solvent evaporation produces massive pores, the sizes of which can be adjusted to exploit the Mie scattering for enhancement of the LH ability. Meanwhile, owing to the strong iconicity, the interface between perovskite nanocrystals fused during recrystallization, which favors carrier transport. Subsequently, PDs based on these Mie porous and interface-fused films show a high on/off ratio of more than 104 and an external quantum efficiency value of 658 % under 9 V bias and 520 nm light irradiation. All about Mie: All-inorganic perovskite films with a porous interface-fused structure are formed by freeze-drying. Mie scattering and interconnection occurring in the porous films significantly enhanced the light harvesting and charge transporting ability. The Mie porous perovskite photodetectors possess a high on/off ratio of more than 104 and the peak external quantum efficiency value of 658 % with a bias of 9 V at 520 nm.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201700600

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