Publication date: 23rd October 2020
Perovskite solar cells (PSCs) represent one of the most promising emerging technologies for conversion of solar energy to electricity, which has attracted a massive attention during the last years, in particular due to their high efficiency of >25%.[1] Although PSCs have a good commercial potential i.e. due to low cost of raw materials and ease of the device fabrication, low operational stability is severely impeding their practical application.
Among different device architectures of PSCs, the p-i-n configuration with the fullerene-based top electron transport layer (ETL) is one of the most intensively studied. The fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) has been widely used as ETL material because of its high electron mobility and good solubility in non-polar solvents. Although PC61BM delivers high efficiencies in p-i-n PSCs, this material has such drawbacks as high cost and poor stability under environmental conditions as well as upon exposure to light or heat.[2,3] Therefore, new ETL materials with optimal electronic and physicochemical properties need to be developed for achieving efficient and stable p-i-n PSCs.
In this work, we investigated the alternating oligomeric compound TBTBT (“T” - thiophene, “B” - benzothiadiazole) as electron transport material for p-i-n PSCs. The fabricated devices demonstrated encouraging performance delivering the power conversion efficiency (PCE) of 10.5% in preliminary experiments. The device performance was largely improved by inserting a thin PC61BM interlayer between the perovskite absorber layer and TBTBT-based ETL. Such modification resulted in spectacular improvement in the device fill factor (FF) from 52% to 82%, which also boosted PCE from 10.5% to 17.8%. Most importantly, using TBTBT as ETL material improved operational stability of perovskite solar cells under continuous light illumination as compared to the reference devices assembled with the conventional PC61BM-based ETL.
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