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Dimethylammonium Incorporation in Lead Acetate Based MAPbI
Wouter M J Franssen1, Bardo J Bruijnaers2, Victor H L Portengen1
1Radboud University, Institute for Molecules and Materials, Solid State NMR, Heyendaalseweg 135, 6525, AJ Nijmegen, The Netherlands.
Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|September 18, 2018
Summary
Methylammonium lead iodide perovskite films can incorporate up to 15% dimethylammonium ions, despite size considerations. This unexpected incorporation originates from precursor solutions and affects the crystal structure of these solar cell materials.
Area of Science:
- Materials Science
- Solid State Chemistry
- Photovoltaics
Background:
- Perovskite thin films are crucial for next-generation solar cell technologies.
- Various production methods exist, but film composition is often overlooked.
- Understanding film composition is key to optimizing solar cell efficiency.
Purpose of the Study:
- To investigate the composition of methylammonium lead iodide films produced using lead acetate.
- To determine the extent and origin of unexpected ion incorporation.
- To analyze the structural impact of incorporated ions.
Main Methods:
- Synthesis of methylammonium lead iodide thin films using lead acetate precursor.
- Chemical analysis to quantify incorporated ions within the perovskite crystal structure.
- Crystallographic analysis to assess the distribution and ordering of incorporated ions.
Main Results:
- Up to 15% dimethylammonium ions were found incorporated into methylammonium lead iodide films.
- Dimethylammonium ions originate from a reaction in the precursor solution facilitated by acetate.
- Incorporated dimethylammonium ions are randomly distributed within the crystal structure.
Conclusions:
- The use of lead acetate in perovskite precursor solutions leads to significant dimethylammonium incorporation.
- This unexpected incorporation challenges previous assumptions about ion size limitations in perovskite structures.
- The random distribution of dimethylammonium ions impacts the overall properties of the perovskite thin film for solar cell applications.
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