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Device simulation of quasi-two-dimensional perovskite/silicon tandem solar cells towards 30%-efficiency 下载免费PDF全文
Xiao-Ping Xie 《中国物理 B》2022,31(10):108801-108801
Perovskite/silicon (Si) tandem solar cells have been recognized as the next-generation photovoltaic technology with efficiency over 30% and low cost. However, the intrinsic instability of traditional three-dimensional (3D) hybrid perovskite seriously hinders the lifetimes of tandem devices. In this work, the quasi-two-dimensional (2D) (BA)2(MA)n-1PbnI3n+1 (n=1, 2, 3, 4, 5) (where MA denotes methylammonium and BA represents butylammonium), with senior stability and wider bandgap, are first used as an absorber of semitransparent top perovskite solar cells (PSCs) to construct a four-terminal (4T) tandem devices with a bottom Si-heterojunction cell. The device model is established by Silvaco Atlas based on experimental parameters. Simulation results show that in the optimized tandem device, the top cell (n=4) obtains a power conversion efficiency (PCE) of 17.39% and the Si bottom cell shows a PCE of 11.44%, thus an overall PCE of 28.83%. Furthermore, by introducing a 90-nm lithium fluoride (LiF) anti-reflection layer to reduce the surface reflection loss, the current density (Jsc) of the top cell is enhanced from 15.56 mA/cm2 to 17.09 mA/cm2, the corresponding PCE reaches 19.05%, and the tandem PCE increases to 30.58%. Simultaneously, in the cases of n=3, 4, and 5, all the tandem PCEs exceed the limiting theoretical efficiency of Si cells. Therefore, the 4T quasi-2D perovskite/Si devices provide a more cost-effective tandem strategy and long-term stability solutions. 相似文献
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设计并合成了一种适用于酸性条件的新型pH荧光探针2,8-双((E)-2-(吡啶-3-基)乙烯基)-6H,12H-5,11-甲二苯并[b,f] [1,5]重氮(TBMP)。探针TBMP以朝格尔碱为骨架,两翼引入间位取代的吡啶端基,其结构经1H NMR、 13C NMR和HR-MS(ESI)表征。并利用pH滴定实验和DFT理论计算探索了探针的pH值变化响应机理。结果表明:探针TBMP由于其间位取代的取代位置效应,显示出独特的两步质子化过程以及特殊的紫外和荧光响应。此外,该探针可以有效地探测酸性pH值(6.5~3.11),并具有良好的稳定性、选择性和较大的斯托克斯位移(127 nm)。 相似文献
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