Improving the efficiency and environmental stability of inverted planar perovskite solar cells via silver-doped nickel oxide hole-transporting layer
Improving the efficiency and environmental stability of inverted planar perovskite solar cells via silver-doped nickel oxide hole-transporting layer
复制标题
通过银掺杂氧化镍空穴传输层提高倒置平面钙钛矿太阳能电池的效率和环境稳定性
DOI：
10.1016/j.apsusc.2017.08.184
复制
发表时间：
2018
影响因子：
6.7
通讯作者：
Li Fan
中科院分区：
文献类型：
--
作者：
Wei Ying;Yao Kai;Wang Xiaofeng;Jiang Yihua;Liu Xueyuan;Zhou Naigen;Li Fan
在本文中，我们展示了高性能的倒置平面异质结钙钛矿太阳能电池（PeSCs）的基础上的新型无机空穴传输层（HTL）的银（Ag）掺杂的NiOx（Ag：NiOx）。密度泛函理论（DFT）计算表明，Ag更喜欢占据替代Ni位（AgNi），并在NiO晶格中表现为受主。与未掺杂的NiO薄膜相比，适量的Ag掺杂可以提高NiO薄膜的光学透明性、功函数、电导率和空穴迁移率。此外，在Ag：NiO上生长的CH3NH3PbI3钙钛矿薄膜具有更好的结晶度、更高的覆盖率和更光滑的表面，且晶粒更大.因此，Ag：NiOxHTL将倒置平面异质结PeSC的效率从13.46%（对于原始的基于NiOx的器件）提高到16.86%（对于2at.% Ag：基于NiOx的装置）。此外，与基于有机HTL和原始NiOxHTL的装置相比，基于Ag：NiOxHTL的PeSC的环境稳定性显著提高。本工作为高效稳定的PESC提供了一种简单有效的HTL材料体系。
In this paper, we demonstrate the high-performance inverted planar heterojunction perovskite solar cells (PeSCs) based on the novel inorganic hole-transporting layer (HTL) of silver (Ag)-doped NiOx(Ag:NiOx). Density-functional theory (DFT) calculation reveals that Ag prefers to occupy the substitutional Ni site (AgNi) and behaves as an acceptor in NiO lattice. Compared with the pristine NiOxfilms, appropriate Ag doping can increase the optical transparency, work function, electrical conductivity and hole mobility of NiOxfilms. Moreover, the CH3NH3PbI3perovskite films grown on Ag:NiOxexhibit better crystallinity, higher coverage and smoother surface with densely packed larger grains than those grown on the pristine NiOxfilm. Consequently, the Ag:NiOxHTL boosts the efficiency of the inverted planar heterojunction PeSCs from 13.46% (for the pristine NiOx-based device) to 16.86% (for the 2 at.% Ag:NiOx-based device). Furthermore, the environmental stability of PeSCs based on Ag:NiOxHTL is dramatically improved compared to devices based on organic HTLs and pristine NiOxHTLs. This work provides a simple and effective HTL material system for high-efficient and stable PeSCs.