Structural features and their functions in surfactant-armoured methylammonium lead iodide perovskites for highly efficient and stable solar cells

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Methylammonium lead iodide perovskites have limited practical applications due to a lack of stability under operating conditions. Environmental stability under heating has not yet been achieved, although recent studies modifying perovskites with long organic cations have reported the progress of stabilisation under humid conditions. In this work, we report the structural evolution of long alkylammonium-modified MAPbI(3) and its functions for highly efficient and stable solar cells. As an encapsulating agent, octylammonium (OA) cation produced individual MAPbI(3) grains in full armour without the formation of layered structures in contrast to butylammonium (BA) and phenethylammonium (PEA) cations. Our OA-armoured MAPbI(3) achieved a stabilised power conversion efficiency of 20.1% without a deterioration of charge transport properties due to highly preferential orientation suppressing non-radiative recombination. The structural features also led to a much improved thermal stability at 85 degrees C in ambient atmosphere retaining 80% of the initial efficiency after 760 h without any encapsulation, as well as water tolerance. This work addresses widespread concerns associated with the photovoltaic efficiency and stability of MAPbI(3) by exploring the inter-relationship between structural features and their functions in surfactant-modified perovskites.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2018-08
Language
English
Article Type
Article
Citation

ENERGY & ENVIRONMENTAL SCIENCE, v.11, no.8, pp.2188 - 2197

ISSN
1754-5692
DOI
10.1039/c8ee00995c
URI
http://hdl.handle.net/10203/282717
Appears in Collection
CBE-Journal Papers(저널논문)
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