钙钛矿(结构)
异质结
光致发光
材料科学
钝化
载流子
碘化物
光电子学
纳米技术
化学
无机化学
结晶学
图层(电子)
作者
Chuanzhao Li,Renlong Zhu,Z. Yang,Jing Lai,Ji Tan,Yi Luo,Shuji Ye
标识
DOI:10.1002/anie.202214208
摘要
Abstract We demonstrate that an ordered 2D perovskite can significantly boost the photoelectric performance of 2D/3D perovskite heterostructures. Using selective fluorination of phenyl‐ethyl ammonium (PEA) lead iodide to passivate 3D FA 0.8 Cs 0.2 PbI 3 , we find that the 2D/3D perovskite heterostructures passivated by a higher ordered 2D perovskite have lower Urbach energy, yielding a remarkable increase in photoluminescence (PL) intensity, PL lifetime, charge‐carrier mobilities ( ϕμ ), and carrier diffusion length ( L D ) for a certain 2D perovskite content. High performance with an ultralong PL lifetime of ≈1.3 μs, high ϕμ of ≈18.56 cm 2 V −1 s −1 , and long L D of ≈7.85 μm is achieved in the 2D/3D films when passivated by 16.67 % para‐fluoro‐PEA 2 PbI 4 . This carrier diffusion length is comparable to that of some perovskite single crystals (>5 μm). These findings provide key missing information on how the organic cations of 2D perovskites influence the performance of 2D/3D perovskite heterostructures.
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