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Magnesium-Doped MAPbI3 Perovskite Layers for Enhanced Photovoltaic Performance in Humid Air Atmosphere

Author:
Yang, Fu, Kamarudin, Muhammad Akmal, Kapil, Gaurav, Hirotani, Daisuke, Zhang, Putao, Ng, Chi Huey, Ma, Tingli, Hayase, Shuzi
Source:
ACS applied materials & interfaces 2018 v.10 no.29 pp. 24543-24548
ISSN:
1944-8252
Subject:
air, iodides, magnesium, materials science, relative humidity, solar cells, spectroscopy
Abstract:
Despite the high efficiency of MAPbI₃ perovskite solar cells, the long term stability and degradation in humid atmosphere are issues that still needed to be addressed. In this work, magnesium iodide (MgI₂) was first successfully used as a dopant into MAPbI₃ perovskite prepared in humid air atmosphere. Mg doping decreased the valence band level, which was determined from photoelectron yield spectroscopy. Compared to the pristine MAPbI₃ perovskite film, the 1.0% Mg-doped perovskite film showed increased crystal grain size and formation of pinhole-free perovskite film. Performance of the solar cell was increased from 14.2% of the doping-free solar cell to 17.8% of 1.0% Mg-doped device. Moreover, 90% of the original power conversion efficiency was still retained after storage in 30–40% relative humidity for 600 h.
Agid:
6064239