Construction of Charge Transport Channels at the NiOx/Perovskite Interface through Moderate Dipoles toward Highly Efficient Inverted Solar Cells

Yuchao Hu; Zheqi Yang; Xiang Cui; Peng Zeng; Faming Li; Xiaochun Liu; Guanqun Feng; Mingzhen Liu

doi:10.1021/acsami.2c01625

Construction of Charge Transport Channels at the NiO_x/Perovskite Interface through Moderate Dipoles toward Highly Efficient Inverted Solar Cells

ACS Appl Mater Interfaces. 2022 Mar 23;14(11):13431-13439. doi: 10.1021/acsami.2c01625. Epub 2022 Mar 9.

Authors

Yuchao Hu^{1

2}, Zheqi Yang^{1

2}, Xiang Cui^{1

2}, Peng Zeng^{1

2}, Faming Li^{1

2}, Xiaochun Liu^{1

2}, Guanqun Feng^{1

2}, Mingzhen Liu^{1

2}

Affiliations

¹ School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China.
² Center for Applied Chemistry, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China.

PMID: 35262337
DOI: 10.1021/acsami.2c01625

Abstract

NiO_x-based perovskite solar cells (PSCs) have attracted much attention because of their low fabrication temperature, suppressed hysteresis, and superior stability. However, the poor interfacial contacts between NiO_x and perovskite layers always limit the progress of PSCs. Here, we applied 2-thiophenemethylamine (TPMA) as charge transport channels at the interface between NiO_x and perovskite layers. The introduction of TPMA provides moderate dipole moment pointing to the perovskite side and effectively promotes the charge transportation. Meanwhile, TPMA anchorage also passivates the defect states at the surfaces of both NiO_x and MAPbI₃, which compensates the voltage loss due to the change in NiO_x work function induced by the dipole. Thus, the device performance has been significantly enhanced in both electrochemical properties and power conversion efficiency. Our work has demonstrated a new way of improving current and voltage in the NiO_x-based PSCs simultaneously through a moderate interfacial dipole moment toward highly efficient PSCs.

Keywords: charge transport; dipole; interface modification; nickel oxide; perovskite solar cell; photovoltaic performance.