Improving the Stability of Perovskite Precursor Solution by Using Additives
Dilek ÇIRAK a, Burak Gültekin a
a Ege University Solar Energy Institute, Ege University Solar Energy Institute 35100 Bornova Izmir Turkey, Izmir, 35100, Turkey
Poster, Dilek ÇIRAK, 210
Publication date: 6th February 2024

In this study, 3,4-dibromothiophene (DBT) additive was added to the precursor solution to stabilize the precursor used in the production of solar cells. With the influence of external factors, they are exposed to during the process between synthesis and coating, perovskite precursor solutions exhibit aging effects that are an important roadblock to producing high-efficiency solar cells[1]. After the synthesis of the precursor solutions, a thin film coated with fresh solutions results in a photoactive black phase, however, films made with aged solutions result in a non-photoactive yellow phase[2]. One of the most effective approaches to reducing these phase transitions is additive engineering. By adding a DBT additive to perovskite precursor solutions, we assume that phase changes would be avoided and the storage time would be increased. It has been suggested that sulfur atoms in DBT will interact with lead, and bromine's steric effect will help to stabilize the perovskite. XRD, UV-VIS, and AFM analyses were performed to see the effects of additive and aging on the perovskite structure in fresh and aged precursor solutions with different amounts of additives added. According to our results, 3 μL/mL additive is the optimum amount for stabilization because it prevents the formation of the yellow phase without damaging the perovskite structure. In addition, solar cells were produced with the fresh precursor solutions synthesized and performance analyses were carried out.

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