Highly stable semitransparent multilayer graphene/LaVO3 vertical-heterostructure photodetectors

A heterostructure composed of a combination of semi-metallic graphene (Gr) and high-absorption LaVO3 is ideal for high-performance translucent photodetector (PD) applications. Here, we present multilayer Gr/LaVO3 vertical-heterostructure semitransparent PDs with various layer numbers (L ( n )). At L ( n ) = 2, the PD shows the best performance with a responsivity (R) of 0.094 A W-1 and a specific detectivity (D*) of 7.385 x 10(7) cm Hz(1/2) W-1 at 532 nm. Additionally, the average visible transmittance of the PD is 63%, i.e. it is semitransparent. We increased photocurrent (PC) by approximately 13%, from 0.564 to 0.635 mu A cm(-2) by using an Al reflector on the semitransparent PD. The PC of an unencapsulated PD maintains about 86% (from 0.571 to 0.493 mu A cm(-2)) of its initial PC value after 2000 h at 25 degrees C temperature/30% relative humidity, showing good stability. This behavior is superior to that of previously reported graphene-based PDs. These results show that these PDs have great potential for semitransparent optoelectronic applications.

Automated summary

A heterostructure composed of graphene and LaVO3 shows great potential for high-performance semitransparent photodetectors. The PD with L(n)=2 demonstrates the best performance with high responsivity and detectivity, and exhibits good stability.