Supramolecular Engineering for Formamidinium-Based Layered 2D Perovskite Solar Cells: Structural Complexity and Dynamics Revealed by Solid-State NMR Spectroscopy

Perovskite solar cells are one of the most promising photovoltaic technologies, although their molecular level design and stability toward environmental factors remain a challenge. Layered 2D Ruddlesden-Popper perovskite phases feature an organic spacer bilayer that enhances their environmental stability. Here, the concept of supramolecular engineering of 2D perovskite materials is demonstrated in the case of formamidinium (FA) containing A(2)FA(n-1)Pb(n)I(3n+1) formulations by employing (adamantan-1-yl)methanammonium (A) spacers exhibiting propensity for strong Van der Waals interactions complemented by structural adaptability. The molecular design translates into desirable structural features and phases with different compositions and dimensionalities, identified uniquely at the atomic level by solid-state NMR spectroscopy. For A(2)FA(2)Pb(3)I(10), efficiencies exceeding 7% in mesoscopic device architectures without any additional treatment or use of antisolvents for ambient temperature film deposition are achieved. This performance improvement over the state-of-the-art FA-based 2D perovskites is accompanied by high operational stability under humid ambient conditions, which illustrates the utility of the approach in perovskite solar cells and sets the basis for advanced supramolecular design in the future.


Published in:
Advanced Energy Materials, 9, 20, 1900284
Year:
May 23 2019
Publisher:
Weinheim, WILEY-V C H VERLAG GMBH
ISSN:
1614-6832
1614-6840
Keywords:
Laboratories:




 Record created 2019-06-18, last modified 2019-07-29


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