3 years ago

A van der Waals p–n Heterojunction Based on Polymer-2D Layered MoS2 for Solution Processable Electronics

A van der Waals p–n Heterojunction Based on Polymer-2D Layered MoS2 for Solution Processable Electronics
Suman Kalyan Pal, Abdus Salam Sarkar
Organic–inorganic heterostructures are emerging materials for developing high performance, solution processable organic electronic and optoelectronic devices. In particular, the heterostructures of semiconducting two-dimensional (2D) transition metal dichalcogenides (TMDs) are interesting due to the quantum confinement effect, extended solar light absorption, and tunable optoelectronic properties. Here, we report a facile and fully solution processable method called semiconductive polymer assisted chemical exfoliation (SPACE) of synthesizing polymer-MoS2 nanoheterostructures. Synthesized polymer grafted MoS2 (PG-MoS2) nanoheterostructures consist of a few layers of MoS2 and are chemically quite stable. The phase integrity of MoS2 in PG-MoS2 is confirmed by various microscopic and spectroscopic techniques. Efficient dissociation of excitons in PG-MoS2 heterostructures is reported and explained based on electron and hole transfers. Strong photovoltaic effects are observed in the polymer-MoS2 heterojunction devices due to photocarrier generation at the interface. In addition, we demonstrate a bipolar resistive switching effect with very high ON/OFF ratio (∼104) in a PG-MoS2 sandwiched device. A thorough carrier transport study has been undertaken to understand the switching effect. Our results reveal that the heterostructures of polymer and layered TMDs could be the basis for up-and-coming solution processable solar cells and memory devices.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b07132

DOI: 10.1021/acs.jpcc.7b07132

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