35A Path toward High-Performance Stable Sn Based Perovskite Solar CellsAshraful IslamDr. Ashraful Islam started his career with the Atomic Energy Commission in Bangladesh. Dr. Islam completed his PhD at the University of Osaka. He was a professor at the University of Tsukuba, a senior researcher at Sharp Corporation, and National Institute of Advanced Industrial Science and Technology (AIST). He has investigated Dye Sensitized Solar Cell (DSCs) since 1998, particularly to improve device efficiency and development of new sensitizers. His aim at NIMS is to construct the next generation of low-cost toxic Pb free Sn-based perovskite solar cells. Dr. Ashraful has published about 220 peer-reviewed papers with a total citation of about 17,600, h-index-57, and possesses many patents. Presently, he is the chief researcher at NIMS.Perovskite solar cells (PSCs) have garnered significant attention due to the rapid advancement in their power conversion efficiency (PCE), which has increased from 3.8% to over 26% over the past 14 years.1 However, the toxicity of Pb effectively hinders the large-scale commercial production of PSCs. Therefore, researchers have turned their attention to Sn-based perovskites due to their similar or even superior optoelectronic properties, such as optimum band gap, higher charge carrier mobility, and low exciton binding energy. The performance of Sn-PSCs is still significantly lower than that of Pb-PSCs, with a maximum efficiency of only 16%. One major drawback is their very low open-circuit voltage (VOC), which results from the inherent instability of Sn²⁺ because of its tendency to oxidize to Sn⁴⁺. Other drawbacks include difficulties forming homogeneous films, and poor alignment of energy levels with charge transport layers. My research addresses these challenges through additive engineering, utilizing a bifunctional additive for both perovskite and electron transport layer (ETL) to achieve the growth of highly crystalline and stable, uniform perovskite films and ETLs, while also reducing the conduction band offset.2-3 In addition to optimizing the ETL, we tackled the limitation of the existing hole transport layer (HTL), such as PEDOT:PSS, which is both acidic in nature and has a huge energy mismatch with Sn-perovskite.4 Collectively, these development allowed us to produce stable and high-performing Sn-based PSCs, which we successfully certified at AIST.References:1. NREL Chart, n.d. https://www.nrel.gov/pv/cell-efficiency.html.2. Islam A. et.al. Small, 20, 2024, 2402896.3. Islam A. et. al. Applied Energy Materials, 8, 2025, 2043-20494. Islam A. et. al. Solar RRL, 9, 2025, 2500047.Chief Researcher, Photovoltaic Materials Group, Research Center for Energy and Environmental Materials (GREEN), National Institute for Materials Science (NIMS)Abstract NIMS Talk 2
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