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Title: Degradation of Highly Alloyed Metal Halide Perovskite Precursor Inks: Mechanism and Storage Solutions

Journal Article · · ACS Energy Letters
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Univ. of Colorado, Boulder, CO (United States)
+ Show Author Affiliations

Whereas the promise of metal halide perovskite (MHP) photovoltaics (PV) is that they can combine high efficiency with solution-processability, the chemistry occurring in precursor inks is largely unexplored. Herein, we investigate the degradation of MHP solutions based on the most widely used solvents, dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). For the MHP inks studied, which contain formamidinium (FA+), methylammonium (MA+), cesium (Cs+), lead (Pb2+), bromide (Br-), and iodide (I-), dramatic compositional changes are observed following storage of the inks in nitrogen in the dark. We show that hydrolysis of DMF in the precursor solution forms dimethylammonium formate, which subsequently incorporates into the MHP film to compromise the ability of Cs+ and MA+ to stabilize FA+-based MHP. The changes in solution chemistry lead to a modification of the perovskite film stoichiometry, band gap, and structure. The solid precursor salts are stable when ball-milled into a powder, allowing for the storage of large quantities of stoichiometric precursor materials.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1432603
Report Number(s):
NREL/JA-5K00-71274
Journal Information:
ACS Energy Letters, Vol. 3, Issue 4; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 64 works
Citation information provided by
Web of Science

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Cited By (11)

Making by Grinding: Mechanochemistry Boosts the Development of Halide Perovskites and Other Multinary Metal Halides journal April 2020
Low-dimensional emissive states in non-stoichiometric methylammonium lead halide perovskites journal January 2019
Crystal structure features of CH 3 NH 3 PbI 3−x Br x hybrid perovskites prepared by ball milling: a route to more stable materials journal January 2020
Engineering Halide Perovskite Crystals through Precursor Chemistry journal October 2019
Stabilization of Precursor Solution and Perovskite Layer by Addition of Sulfur journal March 2019
Myths and reality of HPbI3 in halide perovskite solar cells journal November 2018
A Review on Additives for Halide Perovskite Solar Cells journal April 2020
Dimethylammonium Incorporation in Lead Acetate Based MAPbI 3 Perovskite Solar Cells journal October 2018
Scalable Deposition Methods for Large‐area Production of Perovskite Thin Films journal June 2019
Mechanochemical synthesis of inorganic halide perovskites: evolution of phase-purity, morphology, and photoluminescence journal January 2019
Tolerance factors of hybrid organic–inorganic perovskites: recent improvements and current state of research journal January 2018

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14 SOLAR ENERGY
36 MATERIALS SCIENCE
metal halide perovskite
photovoltaics
degradation
efficiency