铁电 CsPbBr3 纳米晶中的可切换光伏效应
Switchable Photovoltaic Effect in Ferroelectric CsPbBr3 Nanocrystals
AI总结：
本文发现 CsPbBr3 纳米晶在无外加电场下具有铁电驱动的光伏效应，且该效应可通过外加电场增强并切换极化方向，为新型光铁电器件设计提供了潜在候选方案。
摘要：
铁电全无机卤化物钙钛矿纳米晶兼具自发极化和可见光吸收特性，是设计功能性铁电光伏器件的理想候选材料。三维卤化物钙钛矿纳米晶具备铁电潜力，但在无外加电场条件下实现铁电光伏器件仍具挑战。本文报道了常见的全无机卤化物钙钛矿纳米晶 CsPbBr3 在无外加电场下，于可见光下展现出铁电性驱动的光伏效应。CsPbBr3 纳米晶的铁电性源于 Pb(II) 孤对电子的立体化学活性，该活性促进了 PbBr6 八面体畸变。此外，施加外加电场不仅能增强光伏效应，还能使自发极化随电场方向切换。在零偏置条件下，有望实现稳健的抗疲劳性能、柔性和连续光照下的长效光响应。这些发现确立了全无机卤化物钙钛矿纳米晶通过耦合光学功能与铁电响应，作为设计新型光铁电器件潜在候选者的地位。
英文摘要：
Ferroelectric all-inorganic halide perovskites nanocrystals with both spontaneous polarizations and visible light absorption are promising candidates for designing functional ferroelectric photovoltaic devices. Three dimensional halide perovskite nanocrystals have the potential of being ferroelectric, yet it remains a challenge to realize ferroelectric photovoltaic devices which can be operated in absence of an external electric field. Here we report that a popular all-inorganic halide perovskite nanocrystal, CsPbBr3, exhibits ferroelectricity driven photovoltaic effect under visible light in absence of an external electric field. The ferroelectricity in CsPbBr3 nanocrystals originates from the stereochemical activity in Pb (II) lone pair that promotes the distortion of PbBr6 octahedra. Furthermore, application of an external electric field allows the photovoltaic effect to be enhanced and the spontaneous polarization to be switched with the direction of the electric field. Robust fatigue performance, flexibility and prolonged photoresponse under continuous illumination are potentially realized in the zero-bias conditions. These finding establishes all-inorganic halide perovskites nanocrystals as potential candidates for designing novel photoferroelectric devices by coupling optical functionalities and ferroelectric responses.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
