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Keynote Lecture

WEB Functional Nanocomposites Based Highly Stable and Efficient Perovskite Solar Cells

Wednesday (23.09.2020)
09:00 - 09:30 Z: Special Symposia I
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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. Furthermore, most of presented high efficiency PSCs utilize halogenated antisolvents such as toluene and chlorobenzene to assist perovskite crystal growth with large grain-size and high uniformity, but they are toxic and detrimental to environment. To solve such issues, we developed simple methods for production of functional nanocomposites such as Ag-graphene, Al2O3/graphene, NiO-graphene, perovskite/Ag-graphene and perovskite/NiO-graphene, and utilized them for the fabrication of PSCs. We reported 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 = 20.6 %). 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.

Speaker:
Prof. Yoon-Bong Hahn
Jeonbuk National University