WSE2/CUO PHOTODETCTOR ANALYSIS

This letter reports a Al/WSe2/CuO/ITO structure based broadband photodetector. The low cost spin coating technique is utilized to deposit, p-type WSe2 film and n-type CuO film. The Al contacts were deposited over WSe2 film using thermal evaporation unit. The suggested photodetector gives the broad photo response with maximum  Responsivity(A/W)  and External Quantum Efficiency (EQE) value of 3099 A/W,  3680A/W, and 493A/W; 1.20 × 106%, 1.52× 106% and 2.04 × 105% at 350nm (UV),  500nm (visible) and 950nm (IR) under application of -2V bias. The EQE value beyond 100% are attributed to trap assisted photomultiplication mechanism.