DOI: https://doi.org/10.29363/nanoge.inform.2019.031
Publication date: 8th January 2019
Organic–inorganic lead halide perovskites have shown photovoltaic performances above 20% in a range of solar cell architectures while offering simple and low-cost processability. Despite the multiple ionic compositions that have been reported so far, the presence of organic constituents is an essential element in all of the high-efficiency formulations, with the methylammonium and formamidinium cations being the sole efficient options available to date. We present a perovskite composition based on a combination of guanidinium/methylammonium cations that exhibits superior photovoltaic performance and material stability compared with MAPbI3. We demonstrate that the incorporation of large guanidinium (Gua) cations unexpectedly forms a highly stable 3D crystalline structure, plausibly mediated by the increased number of H bonds within the inorganic framework. The prepared MA1–xGuaxPbI3 perovskite preserved the good optoelectronic properties associated with the organic lead halide materials, leading to a high PCE surpassing 20% for a Gua content of 14% and stabilized performance for 1,000 h under continuous light illumination, a fundamental step within the perovskite field.
G.M. thanks the Ministry of Economy and Competitiveness of Spain for a ‘Ramón y Cajal’ contract (RYC-2013-12772) and for financial support (CTQ2014-56422-P).
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