Directly integrated mixed-dimensional van der Waals graphene/perovskite heterojunction for fast photodetection

Authors：Geng, Xiangshun; Zhang, Peigen; Ren, Jun; Dun, Guan-Hua; Li, Yuanyuan; Jin, Jialun; Wang, Chaolun; Wu, Xing; Xie, Dan^*; Tian, He^*; Yang, Yi^*; Ren, Tian-Ling^*

Source：InfoMat, 2022, 4(8): e12347.

DOI：10.1002/inf2.12347

• CH3NH3PbBr3
• graphene
• perovskite
• photodetectors
• van der Waals integration

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 mu s. Moreover, the responsivity and detectivity can be boosted to up to 10.41 A W-1 and 4.65 x 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.

• Institution
  清华大学; y