Speaker：Hao Chen, Post-doctoral fellow at Sargent Group, Department of Chemistry, Northwestern University, Evanston, U.S.
Time：9:00 - 10:00, November 10, 2023 (Beijing Time)
Location：Online
Abstract：
Perovskites have been emerging as excellent semiconductors for photovoltaics for their excellent carrier transport properties, including low defect density, high mobility and long diffusion length. Inverted (pin) perovskite solar cells (PSCs) afford improved operating stability in comparison to their planar nip counterparts, but nevertheless have historically lagged behind in power conversion efficiency (PCE). The presentation will first highlight our initiatives in reducing the energy loss between perovskite and charge transport layers in pin PSCs by employing novel post-treatment methods, which enables the record certified efficiency for single-junction pin PSCs, surpassing for the first time the performance of nip PSCs using the same certification protocols.
Application of the single junction wide-bandgap device in tandem will be presented in the second half of the talk, including double-junction tandem and triple-junction tandem. A novel diammonium salt and lattice distortion model was recently employed in wide-bandgap PSCs, which enables the efficient and stable double-junction and triple-junction all perovskite tandem devices.
Biography：
Hao Chen is currently a post-doctoral fellow in Prof. Ted Sargent group at Department of Chemistry, Northwestern University. In 2020, Hao Chen received his PhD degree under the supervision of Prof. Zhijun Ning in Shanghai Institute of Ceramics, Chinese Academy of Sciences. In April 2021, Hao Chen joined Prof. Ted Sargent group as a post-doctoral fellow at Electrical and Computer Engineering, University of Toronto. In September 2019, Hao Chen joined Prof. Ted Sargent group as a visiting PhD student with the support from CSC. In 2014, Hao Chen earned his bachelor degree in Chemical Engineering and Technology, Xiangtan University, China.
Hao Chen has focused his research topics on single/multi-junction perovskite solar cells from his PhD career, he has achieved several record efficiencies for pin PSCs, including 26.2% QSS certified efficiency for small area (0.05 cm2) PSCs and 25.2% QSS certified efficiency for large area (1.04 cm2) PSCs. His work has been published in top-tier journals including Nature, Science, Nature Materials, Nature Energy, Nature Photonics, Mater and Advanced Materials.
