演講快訊

2024
11.07

Role of Guanidinium Thiocyanate in Tin-Lead Perovskite Solar Cells

Professor Thomas J. Macdonald

時間:2024年11月07日 (四) 16:10
主持人:游聲盛 教授
講者:Professor Thomas J. Macdonald
服務單位:Department of Electronic & Electrical Engineering, University College London
講題:Role of Guanidinium Thiocyanate in Tin-Lead Perovskite Solar Cells
地點:4樓創意講堂

摘要 :

Mixed tin-lead halide perovskites, with their tunable bandgaps around 1.2 eV, show  great promise for the development of highly efficient all-perovskite tandem solar cells. However, achieving commercial viability and long-term stability for Sn-Pb perovskite solar cells (PSCs) presents numerous challenges. Among various optimization strategies, incorporating additives has proven critical in material engineering. Despite the widespread use of additives to improve performance, their detailed photophysical  mechanisms remain unclear. In this work, we elucidate the mechanistic role of  guanidinium thiocyanate (GaSCN) as an additive in the crystallization of Sn-Pb  perovskites, employing advanced steady-state and time-resolved photoluminescence spectroscopy, hyperspectral imaging, and in-situ photoluminescence techniques. Our findings reveal that GaSCN slows the crystal growth rate during perovskite crystallization, resulting in more homogeneous films with reduced non-radiative recombination. The modified film exhibits a photoluminescence quantum yield of 7.28% and a charge carrier lifetime exceeding 17 µs, leading to a device efficiency of 22.34% and fill factor of over 80%.

學經歷 :

2024–Present  Associate Professor/University Research Fellow, University College London, United Kingdom

2022–2024  Senior Lecturer, Queen Mary University of London, United Kingdom

2019– Present  1851 Research Fellow, Imperial College London, United Kingdom

2017–2019  Ramsay Memorial Fellow, University College London, United Kingdom

2016–2017  Research Associate, University College London, United Kingdom

2011–2012  Materials and Interface Technologist, University of South Australia, Australia