Two-dimensional transition-metal dichalcogenides semiconductors are attractive materials for optoelectric devices because of their direct energy bandgap and transparency. To investigate the feasibility of transparent p-n junctions, we have fabricated heterojunctions consisting of WSe2 and MoS2 since WSe2 and MoS2 with proper electrode metals exhibit p-type and n-type behaviors, respectively. These heterojunctions showed rectifying behaviors, indicating that p-n junctions were formed. In addition, photocurrent and photovoltaic effects were observed under light illumination, which were dependent on the gate voltage. Possible origins of gate-tunability are discussed.
Bibliographical noteFunding Information:
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT and Future Planning under Grants 2011-0017486 and 2012R1A4A1029061. S.-G. Yi and J. H. Kim contributed equally to this work.
All Science Journal Classification (ASJC) codes
- Computer Science Applications
- Electrical and Electronic Engineering