Carrier photodynamics in 2D perovskites with solution-processed silver and graphene contacts for bendable optoelectronics

Carrier photodynamics in 2D perovskites with solution-processed silver and graphene contacts for bendable optoelectronics

Silver (Ag) and graphene (Gr) inks have been engineered to serve as efficient electrical contacts for solution-processed two-dimensional (2D) organo-halide (CH 3 (CH 2 ) 3 NH 3 ) 2 (CH 3 NH 3 ) n −1 Pb n I 3 n +1 ( n  = 4) layered perovskites, where all inkjet-printed heterostructure photodetectors...

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Bibliographic Details
Published in:NPJ 2D materials and applications Vol. 5; no. 1; pp. 1 - 12
Main Authors: Hossain, Ridwan F., Min, Misook, Ma, Liang-Chieh, Sakri, Shambhavi R., Kaul, Anupama B.
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 25-03-2021
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Subjects:
639/301/357/1018
639/925/927/511
Chemistry and Materials Science
Electric contacts
Graphene
Heterostructures
Inkjet printing
Inks
Materials Science
Nanotechnology
Optoelectronics
Perovskites
Photoelectric effect
Photoelectric emission
Quantum efficiency
Silver
Strain
Substrates
Surfaces and Interfaces
Thin Films
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Summary:Silver (Ag) and graphene (Gr) inks have been engineered to serve as efficient electrical contacts for solution-processed two-dimensional (2D) organo-halide (CH 3 (CH 2 ) 3 NH 3 ) 2 (CH 3 NH 3 ) n −1 Pb n I 3 n +1 ( n  = 4) layered perovskites, where all inkjet-printed heterostructure photodetectors (PDs) were fabricated on polyimide (PI) substrates. To date, limited studies exist that compare multiple contacts to enable high-performance engineered contacts to 2D perovskites. Moreover, of these few reports, such studies have examined contacts deposited using vapor-based techniques that are time-consuming and require expensive, specialized deposition equipment. In this work, we report on the inkjet printed, direct contact study of solution-processed, 2D perovskite-based PDs formed on flexible PI substrates. Solution processing offers a cost-effective, expedient route for inkjet printing Gr and Ag using a dispersion chemistry developed in this work that is compatible with the underlying 2D perovskite layer to construct the PDs. The wavelength λ -dependent photocurrent I p peaked at λ  ~ 630 nm for both PDs, consistent with the bandgap E g  ~ 1.96 eV for our semiconducting 2D perovskite absorber layer. The external quantum efficiency was determined to be 103% for Ag-perovskite PDs, where strain-dependent bending tests were also conducted to reveal the opto-mechanical modulation of the photocurrent in our devices.
ISSN:2397-7132
2397-7132
DOI:10.1038/s41699-021-00214-3