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Polymerized Hybrid Perovskites with Enhanced Stability, Flexibility, and Lattice Rigidity.

Wenjing ChenYongliang ShiJia ChenPingchuan MaZhibin FangDan YeYiyang LuYongbo YuanJin ZhaoZhengguo Xiao
Published in: Advanced materials (Deerfield Beach, Fla.) (2021)
The intrinsic soft lattice nature of organometal halide perovskites (OHPs) makes them very tolerant to defects and ideal candidates for solution-processed optoelectronic devices. However, the soft lattice results in low stability towards external stresses such as heating and humidity, high density of phonons and strong electron-phonon coupling (EPC). Here, it is demonstrated that the OHPs with unsaturated 4-vinylbenzylammonium (VBA) as organoammonium cations can be polymerized without damaging the perovskite structure and its tolerance to defects. The polymerized perovskites show enhanced stability and flexibility compared to regular three-dimensional and two-dimensional (2D) perovskites. Furthermore, the polymerized 4-vinylbenzylammonium group improves perovskite lattice rigidity substantially, resulting in a reduced non-radiative recombination rate because of suppressed electron-phonon coupling, and enhanced carrier mobility because of suppressed phonon scattering. 2D polymerized perovskite light-emitting diodes (PeLEDs) with strong electroluminescence at room temperature, and quasi-2D PeLEDs with an external quantum efficiency (EQE) of 23.2% and enhanced operation stability are demonstrated. The work has opened a new way of enhancing the intrinsic stability and optoelectronic properties of OHPs.
Keyphrases
  • room temperature
  • solar cells
  • ionic liquid
  • high density
  • high efficiency
  • dna damage
  • solid state
  • electron transfer
  • electron microscopy