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SrCl 2 Derived Perovskite Facilitating a High Efficiency of 16% in Hole‐Conductor‐Free Fully Printable Mesoscopic Perovskite Solar Cells
Author(s) -
Zhang Hua,
Wang Huan,
Williams Spencer T.,
Xiong Dehua,
Zhang Wenjun,
Chueh ChuChen,
Chen Wei,
Jen Alex K.Y.
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201606608
Subject(s) - perovskite (structure) , materials science , mesoscopic physics , energy conversion efficiency , chemical engineering , photovoltaic system , conductor , nanotechnology , optoelectronics , composite material , ecology , physics , quantum mechanics , engineering , biology
Despite the breakthrough of over 22% power conversion efficiency demonstrated in organic–inorganic hybrid perovskite solar cells (PVSCs), critical concerns pertaining to the instability and toxicity still remain that may potentially hinder their commercialization. In this study, a new chemical approach using environmentally friendly strontium chloride (SrCl 2 ) as a precursor for perovskite preparation is demonstrated to result in enhanced device performance and stability of the derived hole‐conductor‐free printable mesoscopic PVSCs. The CH 3 NH 3 PbI 3 perovskite is chemically modified by introducing SrCl 2 in the precursor solution. The results from structural, elemental, and morphological analyses show that the incorporation of SrCl 2 affords the formation of CH 3 NH 3 PbI 3 (SrCl 2 ) x perovskites endowed with lower defect concentration and better pore filling in the derived mesoscopic PVSCs. The optimized compositional CH 3 NH 3 PbI 3 (SrCl 2 ) 0.1 perovskite can substantially enhance the photovoltaic performance of the derived hole‐conductor‐free device to 15.9%, outperforming the value (13.0%) of the pristine CH 3 NH 3 PbI 3 device. More importantly, the stability of the device in ambient air under illumination is also improved.