研究員 Yang 博士と佐野教授のポリマーホール輸送材料を利用したペロブスカイト太陽電池 (PCE >20%) 関する「Achieving 20% Efficiency for Inverted Perovskite Solar Cells by Using Low-Temperature Solution-Processed TFB as Hole-Transporting Layer」と題する論文が Wiley の Advanced Functional Materials (IF: 13.325) に受理され、インサイドフロントカバーに選出されました。
Title: Achieving 20% Efficiency for Inverted Perovskite Solar Cells by Using Low-Temperature Solution-Processed TFB as Hole-Transporting Layer
By D. Yang, T. Sano,* Y. Yaguchi, H. Sun, H. Sasabe, J. Kido*, Adv. Funct. Mater. 2019, 29, 1807556.
Abstract: Low-temperature-processed inverted perovskite solar cells (PVSCs) attract increasing attention because they can be fabricated on both rigid and flexible substrates. For this devices, hole-transporting layers (HTLs) play an important role in achieving efficient and stable inverted PVSCs by adjusting the anodic work function, hole extraction, and interfacial charge recombination. Here, we report the use of a low-temperature (≤ 150 °C) solution-processed ultrathin film of poly[(9,9-dioctyl-fluorenyl-2,7-diyl)-co-(4,4′-(N- (4-secbutylphenyl) diphenylamine)] (TFB) as an HTL in one-step-processed CH3NH3PbI3 (MAPbI3)-based inverted PVSCs. The fabricated device exhibits power conversion efficiency (PCE) as high as 20.2% when measured under AM 1.5 G illumination. This PCE makes them one of the MAPbI3-based inverted PVSCs that have the highest efficiency reported to date. Moreover, this inverted PVSC also shows good stability, which can retain 90% of its original efficiency after 30 days of storage in ambient air.