Andrea Zanetta, Valentina Larini, Vikram, Francesco Toniolo, Badri Vishal, Karim A. Elmestekawy, Jiaxing Du, Alice Scardina, Fabiola Faini, Giovanni Pica, Valentina Pirota, Matteo Pitaro, Sergio Marras, Changzeng Ding, Bumin K. Yildirim, Maxime Babics, Esma Ugur, Erkan Aydin, Chang-Qi Ma, Filippo Doria, Maria Antonietta Loi, Michele De Bastiani, Laura M. Herz, Giuseppe Portale, Stefaan De Wolf, M. Saiful Islam, Giulia Grancini
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引用次数: 0
摘要
控制用于太阳能电池的低维包晶石(LDPs)的晶体生长排列一直是一项挑战,尤其是对于具有宽带隙(1.7 eV)阻碍电荷流动的低n LDPs(n为八面体片数,n为3)。在这里,我们通过在前驱体溶液中添加氯来诱导垂直晶体生长,从而克服了这种传输限制。与三维卤化物包晶(APbX3)不同的是,我们发现氯在单位晶胞的赤道位置取代了I,从而诱导了包晶八面体的垂直应变,这对于启动垂直生长至关重要。原子模型显示了 Cl/I 结构的热力学稳定性和可混溶性,表明了 Cl 在 I 位上的优先并入排列。垂直排列在太阳能电池层面持续存在,在 1.4 V 开路电压下产生了创纪录的 9.4% 功率转换效率,这是 2 eV 宽带隙器件的最高效率。这项研究展示了对低氮 LDP 晶体可调谐性的原子级理解,为智能太阳能外墙和室内能源发电开辟了新的器件可能性。
Vertically oriented low-dimensional perovskites for high-efficiency wide band gap perovskite solar cells
Controlling crystal growth alignment in low-dimensional perovskites (LDPs) for solar cells has been a persistent challenge, especially for low-n LDPs (n < 3, n is the number of octahedral sheets) with wide band gaps (>1.7 eV) impeding charge flow. Here we overcome such transport limits by inducing vertical crystal growth through the addition of chlorine to the precursor solution. In contrast to 3D halide perovskites (APbX3), we find that Cl substitutes I in the equatorial position of the unit cell, inducing a vertical strain in the perovskite octahedra, and is critical for initiating vertical growth. Atomistic modelling demonstrates the thermodynamic stability and miscibility of Cl/I structures indicating the preferential arrangement for Cl-incorporation at I-sites. Vertical alignment persists at the solar cell level, giving rise to a record 9.4% power conversion efficiency with a 1.4 V open circuit voltage, the highest reported for a 2 eV wide band gap device. This study demonstrates an atomic-level understanding of crystal tunability in low-n LDPs and unlocks new device possibilities for smart solar facades and indoor energy generation.
期刊介绍:
Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.