Perovskite based charge transport layers for thin film optoelecronic devices and methods of making
AssigneeThe Florida State University Research Foundation, Inc.
InventorsBiwu Ma, Yu Tian
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Abstract
A new type of charge transport layer based on organometal halide perovskite for highly efficient organic light emitting diodes (OLEDs) is demonstrated. By solution processing of halide perovskite precursors, smooth essentially pure perovskite thin films may be prepared with high transparency and conductivity. Solution processed multilayer OLED with this perovskite-based hole transport layer outperforms a device with a PEDOT:PSS layer.
Claims20
A method for forming a charge transport layer of a thin film optoelectronic device, comprising:
- forming an organometal halide perovskite precursor;
- coating a substrate with the organometal halide perovskite precursor to form an organometal halide perovskite layer;
- passivating the organometal halide perovskite layer with a solvent during the coating step;
- and
- annealing the passivated organometal halide perovskite layer.
A method for forming a charge transport layer of a thin film optoelectronic device, comprising:
- forming an organometal halide perovskite precursor by dissolving methylammonium chloride (CH3NH3Cl) and lead chloride (PbCl2) in a mixture of dimethylformamide and dimethylsulfoxide;
- coating a substrate with the organometal halide perovskite precursor to form a layer of methylammonium lead chloride (CH3NH3PbCl3) on the substrate;
- passivating the methylammonium lead chloride layer by adding a low polarity organic solvent during the coating step;
- and
- annealing the passivated methylammonium lead chloride layer.
An optoelectronic device, comprising:
- a first charge transport layer;
- a photoactive layer;
- and
- a second charge transport layer;
- wherein one or both of the first and second charge transport layers comprise methylammonium lead chloride (CH3NH3PbCl3) deposited from a mixture of methylammonium chloride (CH3NH3Cl) and lead chloride (PbCl2) in a solution of dimethylformamide and dimethylsulfoxide, passivated with a low polarity organic solvent, and thermally annealed.
Dependencies are inferred from the claim text.