Perylene-based Electron Transport Materials in Perovskite Solar Cells To Improve Power Conversion Efficiency

Perovskite solar cells (PSCs) are highly efficient and flexible; thus, they have garnered a lot of focus. In the past, many fullerene compounds, such as PCBM, were employed as electron transport layers in PSCs. PCBM has several drawbacks, including surface trapping states, limited electron mobility, poor photochemical as well as thermal stability, a low open-circuit voltage, and significant recombination losses. So, there was a great need to overcome these arising issues which were affecting the overall performance of the PSCs. Consequently, there started a great interest to develop non-fullerene-based materials which must have anti-properties and at last PDIs were discovered. Perylene diimides (PDIs) derivatives are the best examples of these kinds of materials which are practically originated from perylene. In this review article, we will talk about the different types of PDIs derivatives so that we can compare their open-circuit voltage (V_oc), short-circuit current density (J_sc), and fill factor (FF) values, among other things, and see how their substitutions affect their power conversion efficiencies (PCE) and stability. Here, we found that C3AI has best power conversion efficiency (PCE) of 20.3%. But PSCs that use PDIs have been able to convert power at a top rate of 25.6%. Based on our data, we can say that PDIs are promising ETL materials that can be changed in the future to make PSCs more efficient and stable.