Improved Efficiency and Stability Performances of A Nickel-Oxide Based Inverted Perovskite Solar Cell by Lanthanum Doping
Siowhwa Teo a, Zhanglin Guo a, Zhenhua Xu a, Chu Zhang a, Tingli Ma a
a Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0196, Japan.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Poster, Siowhwa Teo, 078
Publication date: 23rd October 2018

A high performing inverted perovskite solar cell (PSC) is always relying on the quality of the hole transporting layer (HTL) and its interfaces. In this work, we are 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. With the presence of La dopant, the quality of the La-NiOx 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 widen the Voc (> 1V), as compared to the undoped-NiOx. The beneficial effect of La dopant is further being revealed through the PL measurement 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 remarkable stability than that of undoped-NiOx, which unlocks the opportunity for commercialization.

The work was supported by the Grant-in-Aid for Scientific Research (KAKENHI) program, Japan (C, Grant Number 15K05597).

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