A Self‐Formed Stable PbI2/NiOx Interface with Increased Ni3+ Centers for Perovskite Photovoltaics. Issue 24 (22nd March 2022)

• Record Type: Journal Article
• Authors: Zhang, Fan; Zhou, Ziren; Zou, Can; Liu, Xinyi; Xie, Jin; Liu, Da; Yang, Shuang; Hou, Yu; Yang, Hua Gui
• Is Part Of: Chemistry. Volume 28:Issue 24(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-22
• Subjects: nickel oxide -- perovskite solar cells -- ultraviolet ozone; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202200202
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Nickel oxide (NiOx ) is a promising hole transport material (HTM) for perovskite photovoltaics owing to its chemical stability and low cost. However, most NiOx based solar cells deliver relatively weak performance because of its insufficient electrical property and interfacial contact. In this work, a self‐formed PbI2 /NiOx interface was developed to stabilize the Ni 3+ centers, which was beneficial for electrical transport and band alignment in perovskite solar cells. Combined with ultraviolet ozone treatment (UVO ) and sequential deposition, the density of Ni 3+ centers was greatly increased and could be stabilized by the PbI2 interface. These merits contributed coordinately to the fast hole extraction and low energy loss across the PbI2 /NiOx interface, yielding power conversion efficiencies (PCEs) of over 19 %. Abstract : A self‐formed PbI2 /NiOx interface to stabilize the Ni 3+ ‐rich NiOx hole transport layers is proposed. Combined with ultraviolet ozone treatment and sequential deposition, the density of Ni 3+ centers was greatly increased and could be stabilized by the PbI2 interface. These merits contribute coordinately to the better charge transfer capability and the reduction of charge recombination across the PbI2 /NiOx interface.