Directly integrated mixed‐dimensional van der Waals graphene/perovskite heterojunction for fast photodetection
Xiangshun Geng, Peigen Zhang, Junfeng Ren, Guan‐Hua Dun, Yuanyuan Li, Jialun Jin, Chaolun Wang, Xing Wu, Dan Xie, He Tian, Yi Yang, Tian‐Ling Ren
Abstract
Abstract Mixed‐dimensional (2D/3D) van der Waals (vdW) heterostructures made with complementary materials hold a lot of promise in the field of optoelectronic devices. Beyond simple mechanical stacking, directly growing the single‐crystal perovskite on 2D materials to construct a high‐quality vdW heterojunction can better promote carrier transport. In this work, a monolithic integrated graphene/perovskite heterojunction device is fabricated by directly growing a single‐crystal hybrid perovskite on monolayer graphene. Due to the strong interface coupling, the hybrid device achieves self‐powering behavior and exhibits prominent photoresponse properties with a fast response speed of up to 2.05 μs. Moreover, the responsivity and detectivity can be boosted to up to 10.41 A W −1 and 4.65 × 10 12 Jones under the actuation of −3 V bias. This technique not only improves the device performance, but also provides an effective guideline for the development of next‐generation directly integrated vdW optoelectronic devices. image