Hongwei Zhu "Perovskite defect passivation and high efficiency devices fabrication"

Mar 10
March 10, 2021 11:00 am - 12:00 pm

Guest talk

Hongwei ZhuTianjin University

” Perovskite defect passivation and high efficiency devices fabrication”

During the past decade the development of perovskite solar cells (PSCs) has become a game-changer in the field of photovoltaics with relatively rapid progress in the attainment of power conversion efficiencies (PCEs) of over 25%. Improvement in the stability of PSC devices remains the most challenging issue to this PV technology. The best performing PSCs are mostly based on a n-i-p device structure. The perovskite used as the light-absorbing layer is sandwiched between the ETL and the hole transporting layer HTL for selective charge carrier extraction. Since the ETL is deposited in-between the transparent conductive substrate and the perovskite active layer, water and oxygen ingression from the environment destroys the PSCs mainly at the perovskite/HTL interface. Ambient moisture uptake is one of the key issues resulting in poor operational stability of the PSCs due to the intrinsic hydrophilicity of the perovskite active layer materials. In addition, the widely used HTL additives, such as Li-TFSI and tBP, are hydrophilic, intensifying moisture penetration from ambient air to the perovskite through the HTL. How to improve PSCs stability and keep high PCE at same time is very important. In this presentation, I will briefly introduce the fabrication method of efficient and stable PSCs in combination with my works in Prof. Michael’ group, like perovskite/TTL interface passivation, design dopant free HTM, new HTL additive strategy and MA-gas post-treatment.

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