Low Dark Current and Performance Enhanced Perovskite Photodetector by Graphene Oxide as an Interfacial Layer

Abstract

Organic–inorganic hybrid perovskite photodetectors are gaining much interest recently for their high performance in photodetection, due to excellent light absorption, low cost, and ease of fabrication. Lower defect density and large grain size are always favorable for efficient and stable devices. Herein, we applied the interface engineering technique for hybrid trilayer (TiO2/graphene oxide/perovskite) photodetector to attain better crystallinity and defect passivation. The graphene oxide (GO) sandwich layer has been introduced in the perovskite photodetector for improved crystallization, better charge extraction, low dark current, and enhanced carrier lifetime. Moreover, the trilayer photodetector exhibits improved device performance with a high on/off ratio of 1.3 × 104, high responsivity of 3.38 AW−1, and low dark current of 1.55 × 10−11 A. The insertion of the GO layer also suppressed the perovskite degradation process and consequently improved the device stability. The current study focuses on the significance of interface engineering to boost device performance by improving interfacial defect passivation and better carrier transport.

Substrate Effects on the Random Lasing Performance of Solution-Processed Hybrid-Perovskite Multicrystal Film

“…Multicrystalline films were produced by spin-coating a solution of MAPbBr 3 in N,Ndimethylformamide (DMF) with a concentration 560 mg/mL onto different substrates at a speed of 3000 rpm and a duration of 30 s. The materials for synthesizing MAPbBr 3 were purchased from Xi'an Polymer Light Technology Corp. (Xi'an, China) and three different substrates were used: (1) Indium-tin oxide (ITO)-coated glass substrate; (2) Fused silica (FS) substrate; (3) ADCP-coated fused silica (FS) substrate. The precursor solution of ADCP was prepared by mixing 0.7-g tricyclo[5.2.1.0 2,6 ] decanedimethanol diacrylate (A-DCP), 0.3-g dipentaerythritol penta-/hexa-acrylate, and 5-mg 2,2-Dimethoxy-2-phenylacetophenone (DMPA) in a 3-mL bottle, which was stirred for 2 h under red light. The solution was then spin-coated onto a clean FS substrate at a speed of 3000 rpm for 30 s and the produced ADCP film was cured under a UV lamp for about 1 min for the ADCP coating finishing process.…”

“…Methylamine Bromide (MABr) and Lead (II) Bromide (PbBr2) were purchased from Xi'an Polymer Light Technology Corp., N,N-dimethylformamide (DMF, 99.8%) from Adamas, Tricyclo[5.2.1.0 2,6 ] decanedimethanol diacrylate (A-DCP) from SHIN-NAKAMURA CHEM-ICAL CO, LTD. (Wakayama, Japan), dipentaerythritol penta-/hexa-acrylate from Shanghai Aladdin Biochemical Technology Co., Ltd. (Shanghai, China), and 2,2-Dimethoxy-2phenylacetophenone (DMPA) from Shanghai Macklin Biochemical Co., Ltd. (Shanghai, China). All regents were used directly without further purification.…”

“…Lasing performance and devices in various forms have been explored extensively for hybrid organic-inorganic perovskites (HOIPs) [1][2][3][4][5][6]. Random lasers based on these materials are also reported on the basis of different random structures and optical mechanisms [7][8][9][10].…”

Mechanical Control of Polaritonic States in Lead Halide Perovskite Phonons Strongly Coupled in THz Microcavity

“…The use of a GO layer is beneficial for fabricating high-quality films because it improves the perovskite crystallinity owing to enhanced surface passivation. 69 The GO layer is very thin (1 μm) compared to that of the THz wavelength; hence, the resonance characteristics of the cavity are not significantly affected by the insertion of the substrate used to support the perovskite film (Figure S1, Supporting Information). The perovskite film thickness (d film ) could be increased to 1.67 μm while preserving good crystallinity, which is essential for the ultrastrong coupling of the phonons and THz fields.…”

“…In addition, we used a thin graphene oxide (GO) layer (with a thickness of 1 μm), which helped to planarize the membrane surface and prevent wetting of the membrane during the spin-coating processes. The use of a GO layer is beneficial for fabricating high-quality films because it improves the perovskite crystallinity owing to enhanced surface passivation . The GO layer is very thin (1 μm) compared to that of the THz wavelength; hence, the resonance characteristics of the cavity are not significantly affected by the insertion of the substrate used to support the perovskite film (Figure S1, Supporting Information).…”