Version 2 2020-11-11, 11:33Version 2 2020-11-11, 11:33
Version 1 2020-11-10, 16:09Version 1 2020-11-10, 16:09
journal contribution
posted on 2020-11-11, 11:33authored byTzu-Sen Su, Felix Thomas Eickemeyer, Michael A. Hope, Farzaneh Jahanbakhshi, Marko Mladenović, Jun Li, Zhiwen Zhou, Aditya Mishra, Jun-Ho Yum, Dan Ren, Anurag Krishna, Olivier Ouellette, Tzu-Chien Wei, Hua Zhou, Hsin-Hsiang Huang, Mounir Driss Mensi, Kevin Sivula, Shaik M. Zakeeruddin, Jovana V. Milić, Anders Hagfeldt, Ursula Rothlisberger, Lyndon Emsley, Hong Zhang, Michael Grätzel
The use of molecular modulators to
reduce the defect density at
the surface and grain boundaries of perovskite materials has been
demonstrated to be an effective approach to enhance the photovoltaic
performance and device stability of perovskite solar cells. Herein,
we employ crown ethers to modulate perovskite films, affording passivation
of undercoordinated surface defects. This interaction has been elucidated
by solid-state nuclear magnetic resonance and density functional theory
calculations. The crown ether hosts induce the formation of host–guest
complexes on the surface of the perovskite films, which reduces the
concentration of surface electronic defects and suppresses nonradiative
recombination by 40%, while minimizing moisture permeation. As a result,
we achieved substantially improved photovoltaic performance with power
conversion efficiencies exceeding 23%, accompanied by enhanced stability
under ambient and operational conditions. This work opens a new avenue
to improve the performance and stability of perovskite-based optoelectronic
devices through supramolecular chemistry.