| Summary: | In this work, we implemented liquid exfoliation to inkjet-print two-dimensional (2D) black phosphorous (BP) and molybdenum disulfide (MoS<sub>2</sub>) p–n heterojunctions on a standard indium tin oxide (ITO) glass substrate in a vertical architecture. We also compared the optical and electrical properties of the inkjet-printed BP layer with that of the MoS<sub>2</sub> and the electrical properties of the mechanically exfoliated MoS<sub>2</sub> with that of the inkjet-printed MoS<sub>2</sub>. We found significant differences in the optical characteristics of the inkjet-printed BP and MoS<sub>2</sub> layers attributed to the differences in their underlying crystal structure. The newly demonstrated liquid exfoliated and inkjet-printed BP–MoS<sub>2</sub> 2D p–n junction was also compared with previous reports where mechanically exfoliated BP–MoS<sub>2</sub> 2D p–n junction were used. The electronic transport properties of mechanically exfoliated MoS<sub>2</sub> membranes are typically better compared to inkjet-printed structures but inkjet printing offers a cost-effective and quicker way to fabricate heterostructures easily. In the future, the performance of inkjet-printed structures can be further improved by employing suitable contact materials, amongst other factors such as modifying the solvent chemistries. The architecture reported in this work has potential applications towards building solar cells with solution processed 2D materials in the future.
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