Shadabroo Mohammad Saeed, Abdizadeh Hossein, Shabani Mona, Golobostanfard Mohammad Reza
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, Iran.
Center of Excellence in Materials for Low-Energy Consumption Technologies, University of Tehran, Tehran 11155-4563, Iran.
Inorg Chem. 2021 Aug 2;60(15):11110-11119. doi: 10.1021/acs.inorgchem.1c01023. Epub 2021 Jul 14.
Solution-processed Ag-Bi-I rudorffites with direct band gaps of <2 eV show promise for highly efficient and cost-effective Pb-free solar cells. However, relatively fast crystallization rates of Bi-based films and limited solubility of BiI in many solvents result in poor film morphologies, inhibiting their device performance. Here, we conduct a solvent-engineering method to adjust the dynamics of nucleation and growth during film formation. We fabricate AgBiI, AgBiI, and AgBiI absorber layers using a mixed solvent of dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) and find that a volume percentage of 50% DMSO causes highly uniform and dense perovskite films via a BiI-DMSO-AgI intermediate phase formation, leading to solar cells with an improved power conversion efficiency of 0.62% for the AgBiI absorber. These results provide valuable insights into the optimization of the solution processing technique to realize low-toxicity and efficient perovskite solar cells.
溶液法制备的直接带隙小于2 eV的Ag-Bi-I 鲁道夫矿有望用于高效且经济高效的无铅太阳能电池。然而，铋基薄膜相对较快的结晶速率以及BiI在许多溶剂中的溶解度有限，导致薄膜形态不佳，从而抑制了它们的器件性能。在此，我们采用一种溶剂工程方法来调节成膜过程中形核和生长的动力学。我们使用二甲基甲酰胺（DMF）和二甲基亚砜（DMSO）的混合溶剂制备了AgBiI、AgBiI和AgBiI吸收层，发现50%体积比的DMSO通过形成BiI-DMSO-AgI中间相导致高度均匀且致密的钙钛矿薄膜，使得采用AgBiI吸收层的太阳能电池的功率转换效率提高到0.62%。这些结果为优化溶液加工技术以实现低毒性和高效钙钛矿太阳能电池提供了有价值的见解。
