Mixed‐Organic‐Cation Tin Iodide for Lead‐Free Perovskite Solar Cells with an Efficiency of 8.12%
Abstract
In this work, a fully tin-based, mixed-organic-cation perovskite absorber (FA) <i><sub>x</sub></i> (MA)<sub>1-</sub><i><sub>x</sub></i> SnI<sub>3</sub> (FA = NH<sub>2</sub>CH = NH<sub>2</sub><sup>+</sup>, MA = CH<sub>3</sub>NH<sub>3</sub><sup>+</sup>) for lead-free perovskite solar cells (PSCs) with inverted structure is presented. By optimizing the ratio of FA and MA cations, a maximum power conversion efficiency of 8.12% is achieved for the (FA)<sub>0.75</sub>(MA)<sub>0.25</sub>SnI<sub>3</sub>-based device along with a high open-circuit voltage of 0.61 V, which originates from improved perovskite film morphology and inhibits recombination process in the device. The cation-mixing approach proves to be a facile method for the efficiency enhancement of tin-based PSCs.
Funding
- National Natural Science Foundation of China
- National Key Research and Development Program of China
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