Publication date: 23rd September 2021
In the last decade, hybrid perovskites have made a breakthrough in the development of low-cost optoelectronic devices such as high-efficiency solar cells, light-emitting diodes, and photodetectors. Although the need for high efficiency of perovskite solar cells is almost solved, the major drawback limiting the practical application of perovskite-based optoelectronic devices remains their low stability under standard working conditions. Several strategies have been proposed to solve the stability problem of perovskite solar cells, such as modifying the perovskite layer by using mixed dimensionality perovskite[1], using a multiple lattice[2], and optimizing the device structure by adding additional defect passivation layers[3] and hydrophobic charge transport materials. Here we demonstrate the synthesis, characterization, and application of a new organic cation, S-methylthiouronium (SMTU), as an alternative organic cation for the preparation of hybrid perovskites. Our work shows that a mixture of SMTU and methylammonium iodide (MAI) forms a stable perovskite structure with composition (MA)x(SMTI)1-xPbI3, where SMTU significantly exceeds the Goldschmidt tolerance limit. The perovskite solar cells containing SMTU exhibit enhanced stability under ambient conditions and have achieved improved tolerance to photooxidation. Due to its ease of synthesis, low cost, and ability to improve the stability of perovskite materials to photooxidation, SMTU is an excellent candidate for commercial applications.
The authors acknowledge funding from the European Social Fund according to the activity “Improvement of researchers’ qualification by implementing world-class R&D projects” of Measure No. 09.3.3-LMT-K-712-01-0031
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