工作职能
钙钛矿(结构)
材料科学
能量转换效率
带材弯曲
光电子学
图层(电子)
开尔文探针力显微镜
光伏系统
等离子体
结晶
纳米技术
化学工程
电气工程
工程类
原子力显微镜
物理
量子力学
作者
Jiankai Zhang,Chengwen Huang,Huangzhong Yu
摘要
The hole transport layer (HTL) in perovskite solar cells (PVSCs) plays an important role in determining the crystallization of a perovskite film and holes transfer efficiency at the perovskite/HTL interface. Herein, the Nb2CTx Mxene with excellent photoelectric properties was prepared and utilized as the HTL in fabricating the inverted PVSCs. The work function of Nb2CTx HTL was modulated by oxygen plasma treatment through increasing the –O terminated functional groups on the Nb2CTx surface. Under this circumstance, the work function of Nb2CTx HTL was increased due to the enhanced surface dipoles, and the electrons transfer from Nb2C to the –O terminated functional groups. Furthermore, an upward band-bending occurs at the perovskite/HTL interface, which is beneficial to increase the hole transfer efficiency and reduce charge recombination. As a result, the inverted PVSCs with oxygen plasma-treated Nb2CTx HTL achieve the highest power conversion efficiency (PCE) of 20.74% and good stability. Also, the flexible and large area (0.99 cm2) PVSCs achieve the highest PCE of 17.26% and 17.94% by utilizing oxygen plasma-treated Nb2CTx as the HTL. Therefore, this work demonstrates that the Nb2CTx MXene has great potential application in the photovoltaic field, especially in flexible devices.
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