The research data comprises:
1. An excel file containging all x-y data points for all graphs in the main paper
2. An excel file containging all x-y data points for all graphs in the Supplementary Information

The Supplementary Information comprises:
1. Device fabrication details
2. Description of the contact structures
3. Characterisation of the materials (optical transmission, absorption coefficient, Tauc plot, photoemission determination of band edge)
4. Capacitance-voltage mathematics for one-sided and two-sided junctions
5. Capacitance-voltage results (Mott-Shottky plot) 
6. Inferred band diagrams for the heterojunction

The doi of the full paper is 10.1109/JPHOTOV.2020.2981805