Highlight Lecture
WEB SrTiO3/Al2O3-Graphene Electron Transport Layer for Highly Stable and Efficient Composites-Based Perovskite Solar Cells with 20.6 % Efficiency
Wednesday (23.09.2020) 09:30 - 09:45 Z: Special Symposia I Part of:For practical use of perovskite solar cells (PSCs) the instability issues of devices, attributed to degradation of perovskite molecules by moisture, ions migration, and thermal and light instability, have to be solved. Herein, we report highly efficient and stable PSCs based on perovskite/Ag-reduced graphene oxide (Ag-rGO) and mesoporous Al2O3/graphene (mp-AG) composites. The mp-AG composite was conductive with one-order of magnitude higher mobility than mp-TiO2 and used for electron transport layer (ETL). Compared to the mp-TiO2 ETL based cells, the champion device based on perovskite/Ag-rGO and SrTiO3/mp-AG composites showed overall a best performance (i.e., VOC = 1.057 V, JSC = 25.75 mA/cm2, FF = 75.63 % and PCE = 20.58 %). More importantly, the champion device without encapsulation exhibited not only remarkable thermal- and photo-stability but also long-term stability with retaining 97-99 % of the initial values of photovoltaic parameters with sustaining ~ 93% of initial PCE over 300 days under ambient conditions.
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