07 May, 2021 (Fri)Time:
10:00 amWebinar Link:
SpeakerMr. Zhiwen Gao
Department of Electrical and Electronic Engineering
The University of Hong Kong
The organic-inorganic hybrid perovskites have reached the unprecedented high efficiency in photovoltaic applications, which makes the commercialization of perovskite solar cells (PSCs) possible. In the past several years, particular attention has been paid to the stability of PSCs device, which is the critical issue for becoming a practical photovoltaic technology. Especially, the interface induced degradation of perovskite should be the dominant factor causing the poor stability. Here, we introduce the inorganic salt of potassium thiocyanate(KSCN) as a promising interface to offer its superiority as triple passivation including the potassium induced passivation, the double passivation of thiocyanate in the in-between surface of perovskite and NiOx hole transport layer (HTL). Finally, with KSCN interface mediation, the champion PSCs based on the NiOx-based inverted PSCs achieve a PCE of 21.23% with high open-circuit voltage (Voc) of 1.14 V and fill factor (FF) of 0.8, which is superior to that of the device based on pristine NiOx (18.69%), KAc modified NiOx (19.02%) and KCl modified NiOx (19.81%). Moreover, we demonstrate the imidazole bromide functionalized graphene quantum dots (I-GQDs) to regulate the interface between electron transport layer (ETL) and formamidinium lead iodide perovskite layer and achieve a high efficiency of 22.37 % with enhanced long-term stability.
Zoom Link (during COVID-19 special period):
Meeting ID: 852 4891 1443
Biography of the speaker:
Zhiwen Gao received the B.S. degree in new energy materials from Tianjin University, China in 2018. He is currently working toward Ph.D. degree at The University of Hong Kong. His research interest is semiconductor optoelectronic devices.
All are welcome.
OrganizerProf. Wallace C.H. Choy
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