Publication date: 15th July 2022
Hybrid organic-inorganic perovskite proved to be a promising photovoltaic material for both solar cells and LED devices. Recent development in perovskite based devices presented the possibility of a dual functionality as a solar cell and as an LED. Studying the performance of the perovskite as a light harvester and as a light emitter material in the same device provides insight into the properties of the perovskite layer. In this work, we used a mixture of two solvents- DMF and DMSO. We changed the solvent ratio from a DMSO:DMF ratio of 0.2:0.8 to 0.0:1.0 (i.e. without DMSO). We tracked the film formation and implemented them in complete devices which can function simultaneously as an LED and as a solar cell.
The change in the solvent ratio was found to have an opposite effect on the device performance as a solar cell and as an LED. The solar cell improved at high DMSO ratios due to highly crystalline perovskite film with a lower amount of PbI2 residues. However, the LED requires more defects, a higher amount of PbI2 residues and is less sensitive to film uniformity, therefore performed better at lower DMSO ratios.
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