Efficient Inverted Planar Perovskite Solar Cells Using Ultraviolet/Ozone‐Treated NiO_x as the Hole Transport Layer

Abstract

Nickel oxide (NiOx) has exhibited great potential as a hole transport layer (HTL) for fabricating efficient and stable perovskite solar cells (PSCs). However, it has been greatly limited by its fabrication and manipulation process. In this work, a simple processing method on an ultrathin electrochemical mesoporous NiOx film manipulated by controllable ultraviolet/ozone (UVO) treatmentis employed; the duration of UVO treatment on the NiOx film significantly affects the photovoltaic properties of the PSCs. When the exposure duration increases, the wettability, electrical conductivity, nonstoichiometry, and valence band energy of the NiOx film are improved with varying degrees. Besides, the perovskite grain size, recombination resistance at the perovskite/NiOx interface, and build‐in potential of the device also increase, resulting in higher short‐circuit current density (JSC) and open‐circuit voltage (VOC). Combining these factors together, an optimal exposure time of UVO treatment on the NiOx film has been achieved at 5 min, which results in a significantly high performance with an efficiency of 19.67%, large VOC (>1.1 V), and JSC (>23 mA cm−2). Furthermore, the experimental results are coincide well with simulation results on the different corresponding subjects. Hopefully, this work could facilitate material manipulation toward scalable, high efficiency, and stable solar cells.

Triple Interface Passivation Strategy‐Enabled Efficient and Stable Inverted Perovskite Solar Cells

“…[25,26] Moreover, the interface defects and rough contact with perovskite layer for nonstoichiometric NiO x thin film will cause the hole accumulation and trap-assisted nonradiative recombination losses. [27,28] There are few works focusing on the modification of NiO x hole transport layer. Limited alkali halides have been reported to provide an interface passivation effect for NiO x -based inverted PSCs and only focused on one in-between surface to the perovskite side.…”

Inorganic CsPbIBr2‐Based Perovskite Solar Cells: Fabrication Technique Modification and Efficiency Improvement

“…Promisingly, solar energy, for its clean, abundance, and renewability, has already been recognized as an effective and practical path to solve these issues. To achieve a magnificent energy conversion from solar power to electricity, photovoltaic (PV) devices exhibit their enormous potential in this application . Thereinto, halide perovskite solar cells (HPSCs), as a representative of the third‐generation cells, are very promising technology, due to their amazing optoelectronic features, as well as low cost and facile manufacturing .…”

3 D NiO Nanowall Hole‐Transporting Layer for the Passivation of Interfacial Contact in Inverted Perovskite Solar Cells

“…The histogramo fd evices (70 cells) in Figure 6c demonstrates good reproducibility.C onsidering the appreciable device performance, we also comparedo ur devices with other reported high-performance NiO-based PSCs (PCE > 18 %). [46][47][48][49][50][51][52][53][54][55][56] The statistics of the related V oc and FF are presented in Figure 6d.C learly,the impressive V oc ( % 1.11V)with high FF (> 80 %) of our devices is prominent in the reported works.…”