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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
A Strategy to Produce High Efficiency, High Stability Perovskite Solar Cells Using Functionalized Ionic
Yi Zhang1,2, Zhaofu Fei3, Peng Gao1
1Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1951, Sion, Switzerland.
Functionalized imidazolium iodide salts improve perovskite solar cell efficiency. A specific allyl-functionalized ionic liquid dopant achieved a record 19.21% power conversion efficiency in perovskite solar cells using a fumigation method.
Area of Science:
- Materials Science
- Renewable Energy
- Chemical Engineering
Background:
- Perovskite solar cells offer a promising alternative to silicon-based photovoltaics.
- Improving the power conversion efficiency (PCE) and stability of perovskite solar cells is crucial for commercialization.
- Ionic liquids are explored as dopants to enhance perovskite film quality and device performance.
Purpose of the Study:
- To investigate the effect of functionalized imidazolium iodide salts as dopants in the synthesis of methylammonium lead iodide (CH3NH3PbI3)-type perovskites.
- To evaluate the performance of perovskite solar cells fabricated with these doped perovskite films, particularly focusing on power conversion efficiency.
- To determine the optimal functional group for ionic liquid dopants to achieve high-efficiency perovskite solar cells.
Main Methods:
- Synthesis of functionalized imidazolium iodide salts with allyl (CH2=CHCH2), propargyl (CH2C≡CH), and propargyl amine (CH2C≡N) side chains.
- Incorporation of these ionic liquids as dopants during the synthesis of CH3NH3PbI3 perovskite films.
- Fabrication of perovskite solar cell devices using the doped films.
- Characterization of the perovskite films and evaluation of the solar cell devices' power conversion efficiency (PCE).
Main Results:
- The perovskite solar cell doped with the allyl-functionalized imidazolium iodide salt achieved a record power conversion efficiency of 19.21%.
- This efficiency is the highest reported for perovskite solar cells synthesized using a fumigation step.
- Doping with propargyl and propargyl amine functionalized salts resulted in similar or lower PCE compared to the undoped control device.
Conclusions:
- Functionalized imidazolium iodide salts can effectively serve as dopants to enhance perovskite solar cell performance.
- The allyl side chain on the imidazolium iodide salt is particularly beneficial for achieving high power conversion efficiency in CH3NH3PbI3 perovskites.
- Further research into structure-property relationships of ionic liquid dopants is warranted for optimizing perovskite solar cell technology.
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