Mixed-Dimensional van der Waals Heterostructure for High-Performance and Air-Stable Perovskite Nanowire Photodetectors

Abstract

An organic–inorganic hybrid perovskite nanowire (NW), CH3NH3PbI3, shows great potential for high-performance photodetectors due to its excellent photoresponse. However, the inefficient carrier collection between the one-dimensional (1D) NWs and metallic electrodes, as well as degradation of the perovskite, limits the viability of the CH3NH3PbI3 NWs for commercial production. Here, we demonstrate a photodetector with a mixed-dimensional van der Waals heterostructure of hexagonal boron nitride (hBN)/graphene (Gr)/1D CH3NH3PbI3, which exhibits excellent responsivity and specific detectivity of up to 558 A/W and 2.3 × 1012 Jones, owing to the improved carrier extraction at the electrical contact between Gr and the NW. As for the atomic encapsulation of hBN, the device is extremely robust and maintains its outstanding performance for more than 2 months when exposed to air. Moreover, benefitting from the 1D geometry of the CH3NH3PbI3 NW, our device is highly sensitive to polarized light. The mixed-dimensional van der Waals heterostructure, hBN/Gr/1D CH3NH3PbI3, would provide a novel idea and protocol for fabricating high-performance and air-stable photoelectronic devices based on organic–inorganic hybrid perovskite NWs.

Transparent and Reusable Nanostencil Lithography for Organic–Inorganic Hybrid Perovskite Nanodevices

“…This is because of the efficient separation of photogenerated electrons and holes owing to the energy band offset of BA 2 MAPb 2 I 7 and MAPbI 3 . [ 15,41 ] Based on the band structure results of BA 2 MAPb 2 I 7 and MAPbI 3 reported previously, [ 38,42 ] the energy band alignment of the heterostructure is shown in Figure 3d. Type II band alignment was formed at the heterojunction, resulting in holes transfer from MAPbI 3 to BA 2 MAPb 2 I 7 and electrons transfer from BA 2 MAPb 2 I 7 to MAPbI 3 .…”

“…[12][13][14] For example, photodetectors based on hybrid perovskite films, nanowires, and nanosheets have been reported to exhibit excellent performances. [15][16][17] Owing to the extremely low dark current and ultra-high photoresponse, state-of-the-art properties, including a responsivity of 1.5 × 10 4 A W −1 and detectivity above 10 15 Jones, have been recently demonstrated in a 2D hybrid perovskite photodetector. [18] Despite rapid progress in hybrid perovskite applications, the investigation of hybrid perovskite devices remains in its infancy.…”

Plasmon resonance-enhanced superior 2D MoS2 photodetector via single-layer gold nanoparticle film with ultra-high area density

“…To further characterize the performance of our photodetectors, the responsivity (R) as a function of light intensity was investigated, as shown in figures 4(b) and (c). The responsivity is a key figure of merit determining the device's electrical response to the incident light, which is calculated by the equation R = I light /PA [52], where I light is the photocurrent, I dark is the dark current, P is the incident light intensity, and A is the active area of the device. As shown in figure 4(b), the responsivity decreases gradually with the increasing light intensity, which is a general observation for MoS 2 photodetectors, caused by the higher probability of scattering and recombination under stronger illumination [20,34].…”

Tailoring optoelectronic performance through compositional engineering to optimize trap densities in Cs x MA(1− x) PbI3 perovskite nanowires

“…Notably, MAPbI 3 , a representative member of the MAPbX 3 family, boasts exceptional light-harvesting capabilities with an absorption coefficient as high as 10 5 cm −1 , surpassing existing optoelectronic materials [13]. Consequently, MAPbI 3 NWs have found applications in high-performance optoelectronic devices such as photodetectors [14,15], light-emitting diodes [9], and lasers [16,17]. For example, MAPbI 3 NW-based photodetectors have exhibited remarkable characteristics, including low dark current (⩽1 nA) [18] and high detectivity (⩾10 12 Jones) [19].…”