Momblona Cristina, Kanda Hiroyuki, Sutanto Albertus Adrian, Mensi Mounir, Roldán-Carmona Cristina, Nazeeruddin Mohammad Khaja
Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais Wallis, Rue de l'Industrie 17, 1951, Sion, Switzerland.
Sci Rep. 2020 Jun 30;10(1):10640. doi: 10.1038/s41598-020-67606-1.
The most studied perovskite-based solar cells reported up to date contain the toxic lead in its composition. Photovoltaic research and development towards non-toxic, lead-free perovskite solar cells are critical to finding alternatives to reduce human health concerns associated with them. Bismuth-based perovskite variants, especially in the form of methylammonium bismuth iodide (MBI), is a good candidate for the non-toxic light absorber. However, the reported perovskite variant MBI thin films prepared by the solution process so far suffers from poor morphology and surface coverage. In this work, we investigate for the first time the optoelectronic, crystallographic and morphological properties of MBI thin films prepared via thermal co-evaporation of MAI and BiI. We find by modifying the precursor ratio that the layer with pure MBI composition lead to uniform, compact and homogeneous layers, broadening the options of deposition techniques for lead-free based perovskite solar cells.
迄今为止报道的研究最多的钙钛矿基太阳能电池在其成分中含有有毒的铅。开展无毒、无铅钙钛矿太阳能电池的光伏研发对于寻找替代方案以减少与之相关的人类健康问题至关重要。铋基钙钛矿变体，特别是碘化甲基铵铋（MBI）形式，是无毒光吸收剂的良好候选材料。然而，到目前为止，通过溶液法制备的钙钛矿变体MBI薄膜存在形态不佳和表面覆盖率低的问题。在这项工作中，我们首次研究了通过MAI和BiI的热共蒸发制备的MBI薄膜的光电、晶体学和形态学性质。我们发现，通过改变前驱体比例，具有纯MBI组成的层会形成均匀、致密且同质的层，拓宽了无铅钙钛矿太阳能电池沉积技术的选择范围。
