The Role of Lanthanum On A Nickel Oxide-Based Inverted Perovskite Solar Cell For Efficiency and Stability Improvement.

Author(s) Teo, S.H.; Guo, Z.; Xu, Z.; Zhang, C.; Ma, T.; Hayase, S.; Yusuke, K.
Journal ChemSusChem
Date Published 2018 Nov 18

A high performing inverted perovskite solar cell (PSC) always relies on the hole transporting layer (HTL) quality and its interfaces. This work is the first to investigate the impact of lanthanum (La) incorporation within the NiOx matrix for high conductivity, charge extraction ability, and stability without compromising its power conversion efficiency. In the presence of La dopant, the La-NiOx quality is obviously improved; without the formation of pinholes. In addition, the inclusion of La alters the energy band alignment; consequently, enhances the hole transportation and widens the Voc (> 1V), as compared to the undoped-NiOx. The beneficial effect of La dopant is further revealed through the PL measurement and density of states (DOS) analysis, where trap states are passivated by La. More importantly, the perovskite solar cell, with La-doped NiOx as the HTL, exhibits 21% enhancement in efficiency and a remarkable stability than that of undoped-NiOx. This also unlocks another opportunity for commercialization.

DOI 10.1002/cssc.201802231
ISSN 1864-564X
Citation ChemSusChem. 2018.

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