(CHCHNH)GeI：一种具有光伏应用潜力的层状二维钙钛矿。
(CHCHNH)GeI: A Layered Two-Dimensional Perovskite with Potential for Photovoltaic Applications.
作者信息
Cheng Pengfei, Wu Tao, Zhang Jiangwei, Li Yajuan, Liu Junxue, Jiang Lei, Mao Xin, Lu Rui-Feng, Deng Wei-Qiao, Han Keli
机构信息
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, People's Republic of China.
University of the Chinese Academy of Sciences , Beijing 100039, People's Republic of China.
出版信息
J Phys Chem Lett. 2017 Sep 21;8(18):4402-4406. doi: 10.1021/acs.jpclett.7b01985. Epub 2017 Sep 1.
Recently, two-dimensional organic-inorganic perovskites have attracted increasing attention due to their unique photophysical properties and high stability. Here we report a lead-free, two-dimensional perovskite, (PEA)GeI (PEA = CH(CH)NH). Structural characterization demonstrated that this 2D perovskite structure is formed with inorganic germanium iodide planes separated by organic PEAI layers. (PEA)GeI has a direct band gap of 2.12 eV, in agreement with 2.17 eV obtained by density functional theory (DFT) calculations, implying that it is suitable for a tandem solar cell. (PEA)GeI luminesces at room-temperature with a moderate lifetime, exhibiting good potential for photovoltaic applications. In addition, 2D (PEA)GeI is more stable than 3D CHNHGeI in air, owing to the presence of a hydrophobic organic long chain. This work provides a direction for the development of 2D Ge-based perovskites with potential for photovoltaic applications.
最近，二维有机-无机钙钛矿因其独特的光物理性质和高稳定性而受到越来越多的关注。在此，我们报道一种无铅二维钙钛矿（PEA）GeI（PEA = CH(CH)NH）。结构表征表明，这种二维钙钛矿结构是由被有机PEAI层隔开的无机碘化锗平面形成的。（PEA）GeI的直接带隙为2.12 eV，与密度泛函理论（DFT）计算得到的2.17 eV一致，这意味着它适用于串联太阳能电池。（PEA）GeI在室温下发光，具有适中的寿命，在光伏应用中展现出良好的潜力。此外，由于存在疏水性有机长链，二维（PEA）GeI在空气中比三维CHNHGeI更稳定。这项工作为具有光伏应用潜力的二维锗基钙钛矿的发展提供了一个方向。
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