Synergistic passivation and stepped-dimensional perovskite analogs enable high-efficiency near-infrared light-emitting diodes.
Yongjie LiuChen TaoYu CaoLiangyan ChenShuxin WangPei LiCheng WangChenwei LiuFeihong YeShengyong HuMeng XiaoZheng GaoPengbing GuiFang YaoKailian DongJiashuai LiXuzhi HuHengjiang CongShuangfeng JiaTi WangJianbo WangGang LiWei HuangWeijun KeJianpu WangGuojia FangPublished in: Nature communications (2022)
Formamidinium lead iodide (FAPbI 3 ) perovskites are promising emitters for near-infrared light-emitting diodes. However, their performance is still limited by defect-assisted nonradiative recombination and band offset-induced carrier aggregation at the interface. Herein, we introduce a couple of cadmium salts with acetate or halide anion into the FAPbI 3 perovskite precursors to synergistically passivate the material defects and optimize the device band structure. Particularly, the perovskite analogs, containing zero-dimensional formamidinium cadmium iodide, one-dimensional δ-FAPbI 3 , two-dimensional FA 2 FA n-1 Pb n I 3n+1 , and three-dimensional α-FAPbI 3 , can be obtained in one pot and play a pivotal and positive role in energy transfer in the formamidinium iodide-rich lead-based perovskite films. As a result, the near-infrared FAPbI 3 -based devices deliver a maximum external quantum efficiency of 24.1% together with substantially improved operational stability. Combining our findings on defect passivation and energy transfer, we also achieve near-infrared light communication with device twins of light emitting and unprecedented self-driven detection.
Keyphrases
- energy transfer
- high efficiency
- solar cells
- light emitting
- quantum dots
- room temperature
- heavy metals
- ionic liquid
- molecular docking
- study protocol
- perovskite solar cells
- high glucose
- randomized controlled trial
- cancer therapy
- clinical trial
- dna repair
- oxidative stress
- drug induced
- molecular dynamics
- loop mediated isothermal amplification
- preterm birth
- drug delivery
- stress induced