Phase Segregation in Potassium-Doped Lead Halide Perovskites from 39 K Solid-State NMR at 21.1 T

Journal of the American Chemical Society
Dominik J KubickiLyndon Emsley

Abstract

Organic-inorganic lead halide perovskites are a promising family of light absorbers for a new generation of solar cells, with reported efficiencies currently exceeding 22%. A common problem of solar cells fabricated using these materials is that their efficiency depends on their cycling history, an effect known as current-voltage ( J- V) hysteresis. Potassium doping has recently emerged as a universal way to overcome this adverse phenomenon. While the atomistic origins of J- V hysteresis are still not fully understood, it is essential to rationalize the atomic-level effect of protocols that lead to its suppression. Here, using 39K MAS NMR at 21.1 T we provide for the first time atomic-level characterization of the potassium-containing phases that are formed upon KI doping of multication and multianion lead halide perovskites. We find no evidence of potassium incorporation into 3D perovskite lattices of the recently reported materials. Instead, we observe formation of a mixture of potassium-rich phases and unreacted KI. In the case of Br-containing lead halide perovskites doped with KI, a mixture of KI and KBr ensues, leading to a change in the Br/I ratio in the perovskite phase with respect to the undoped perovskite. Simultaneo...Continue Reading

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Citations

Dec 18, 2019·Angewandte Chemie·Li HongMichael Graetzel
Oct 21, 2020·Nature Materials·Wenxin MaoUdo Bach
Jan 8, 2021·Chemical Society Reviews·Ammarah KausarYue Zhang
Jul 16, 2021·ACS Applied Materials & Interfaces·Zhen BaoRu-Shi Liu
Nov 9, 2019·Accounts of Chemical Research·Daniel ProchowiczJanusz Lewiński
Jan 2, 2021·Chemistry of Materials : a Publication of the American Chemical Society·Muhammad ImranLiberato Manna
Jul 30, 2020·ACS Central Science·Laura PiveteauMaksym V Kovalenko
Mar 2, 2019·Chemical Reviews·Ajay Kumar JenaTsutomu Miyasaka
Oct 20, 2020·Chemistry of Materials : a Publication of the American Chemical Society·Dominik J KubickiSamuel D Stranks
Sep 29, 2020·Journal of the American Chemical Society·Laura PiveteauMaksym V Kovalenko
Nov 26, 2021·The Journal of Physical Chemistry Letters·Yingping FanYixin Zhao

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