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.
Highlights
In recent years, photodetectors (PDs) have been attracting much interest due to their potential applications in the field of optical communication [1,2,3], large-area optoelectronic devices [1,2,3], environmental monitoring [4,5], day- and night-time surveillance [6,7,8], and biomedical sensing [9,10]
The perovskite layer was deposited on the graphene oxide (GO) layer
The aluminum metal (Al) electrodes were evaporated on the perovskite layer using an interdigital mask through thermal evaporation
Summary
Photodetectors (PDs) have been attracting much interest due to their potential applications in the field of optical communication [1,2,3], large-area optoelectronic devices [1,2,3], environmental monitoring [4,5], day- and night-time surveillance [6,7,8], and biomedical sensing [9,10]. Most research consideration of photodetectors has been devoted to the vertical structures [11,12,13,14], whereas lateral photodetector architectures [15,16,17] have attracted increasing attention lately due to their ease of fabrication. The photogenerated excitons in organic materials are difficult to be dissociated into free electrons and holes due to large binding energies (0.3–1.0 eV) [24]. The dissociated electrons still need to overcome the depletion barrier and require large diffusion length created by multilayer structure [25]
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