材料科学
光伏
钙钛矿(结构)
纳米复合材料
氟化物
联锁
纳米技术
化学工程
光伏系统
无机化学
机械工程
电气工程
化学
工程类
作者
Youchao Wei,Xianjin Wang,Zhaoyu Wang,Di Wang,Yameng Chen,Haoyu Zhang,Qing Zhao,Yongsheng Liu,Qing Zhao,Maochun Hong
标识
DOI:10.1002/adfm.202316058
摘要
Abstract All‐inorganic α ‐phase CsPbI 3 perovskite with a suitable bandgap and superb optoelectronic properties is transforming the landscape of perovskite photovoltaics, but its long‐term lability associated with “soft” ionic lattice still imposes a great challenge for practical applications. Herein, a unique solid‐solution fluorination strategy is proposed to deliver an “ideal” perovskite matrix of α ‐phase CsPbI 3 abundant with F ions through interlocking the soft lattice of CsPbI 3 with cubic‐phase CsF·3/2HF. Such a sublattice interlocking can not only stabilize the soft lattice of α ‐phase CsPbI 3 perovskite nanocrystals but also passivate their notorious surface defects, thereby producing a “rigid” solid‐solution‐type perovskite/fluoride CsPbI 3 /CsF (termed as CsPbI 3 :F) nanocomposite with excellent long‐term stability and a near‐unity photoluminescence efficiency. Of particular note is that these CsPbI 3 :F nanocomposites can work well as effective grain boundary anchors to significantly improve the photovoltaic performance of perovskite solar cells because of their F‐rich perovskite lattice, achieving a T 80 stability of 1500 h under continuous maximum power point tracking and AM 1.5G illumination without the need for encapsulation. This work paves a new way to deliver perovskite materials with desirable properties for photovoltaics.
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