State Key Laboratory of Nuclear Physics and Technology and ‡State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University , Beijing 100871, PR China.
ACS Appl Mater Interfaces. 2017 Dec 6;9(48):42029-42034. doi: 10.1021/acsami.7b12476. Epub 2017 Nov 27.
In recent years, perovskite solar cells have drawn a widespread attention. As an electrode material, fluorine-doped tin oxide (FTO) is widely used in various kinds of solar cells. However, the relatively low work function (WF) (∼4.6 eV) limits its application. The potential barrier between the transparent conductive oxide electrode and the hole transport layer (HTL) in inverted perovskite solar cells results in a decrease in device performance. In this paper, we propose a method to adjust WF of FTO by implanting zirconium ions into the FTO surface. The WF of FTO can be precisely and continuously tuned between 4.59 and 5.55 eV through different dopant concentration of zirconium. In the meantime, the modified FTO, which had a WF of 5.1 eV to match well the highest occupied molecular orbital energy level of poly(3,4-ethylenedioxylenethiophene):polystyrene sulfonate, was used as the HTL in inverted planar perovskite solar cells. Compared with the pristine FTO electrode-based device, the open circuit voltage increased from 0.82 to 0.91 V, and the power conversion efficiency increased from 11.6 to 14.0%.
近年来，钙钛矿太阳能电池引起了广泛关注。作为一种电极材料，掺氟氧化锡（FTO）广泛应用于各种太阳能电池中。然而，其较低的功函数（WF）（约 4.6eV）限制了其应用。在倒置钙钛矿太阳能电池中，透明导电氧化物电极与空穴传输层（HTL）之间的势垒导致器件性能下降。在本文中，我们提出了一种通过在 FTO 表面注入锆离子来调整 FTO WF 的方法。通过改变锆的掺杂浓度，可以精确且连续地将 FTO 的 WF 调谐在 4.59 到 5.55eV 之间。同时，将 WF 调至 5.1eV 的改性 FTO 用作倒置平面钙钛矿太阳能电池的 HTL，与原始 FTO 电极基器件相比，开路电压从 0.82V 增加到 0.91V，功率转换效率从 11.6%增加到 14.0%。
