RPG Seminar – Interface Engineering for High Efficiency and Stable Perovskite Solar Cells
Date:
07 May, 2021 (Fri)
Time:
10:00 am
Webinar Link:
https://us02web.zoom.us/j/85248911443?pwd=bkZCNE03b0kzM1VYY2RGNktteUFGdz09

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Speaker

Mr. Zhiwen Gao
Department of Electrical and Electronic Engineering
The University of Hong Kong

Abstract

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):
https://us02web.zoom.us/j/85248911443?pwd=bkZCNE03b0kzM1VYY2RGNktteUFGdz09
Meeting ID: 852 4891 1443
Passcode: 6Mmq4F

 

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.


Organizer

Prof. Wallace C.H. Choy

Most seminars are open to the general public, free of charge, unless otherwise stated. Registration is not required. Arrangement for car parking facilities on campus please contact us for details.

For enquiries, please contact:
Department of Electrical and Electronic Engineering,
Room 601, Chow Yei Ching Building,
Pokfulam Road, Hong Kong
Tel: (852) 3917 7093
Email: seminar@eee.hku.hk