High-performance nanotube-enhanced perovskite photodetectors

Abstract

Organic-inorganic perovskites have already shown a tremendous potential for low-cost light-harvesting devices. Yet, the relatively low carrier mobilities in bulk perovskites still prevent large-area devices with performances competing with state-of-the-art technologies. Here, we tackle this fundamental challenge by incorporating single-wall carbon nanotubes within a perovskite matrix by means of a simple two-step method in ambient air. Using this nano-engineered hybrid film, we demonstrate large-area photodetectors with responsivities up-to 13.8 A.W−1 and a broad spectral response from 300 to 800 nm, indicating that photocurrent generation arises from the charge transfer from the perovskite matrix to the embedded nanotube network. As the nanotubes facilitate the carrier extraction, these photodetectors also show a fast response time of 10 ms. This is significantly faster than most of previous reports on perovskite-based photodetectors, including devices with much smaller photosensitive areas. This approach is also well-suited for large-scale production of other perovskite-based light-harvesting devices.

Optical detection of charge dynamics in CH3NH3PbI3/carbon nanotube composites

“…1c). These nanocrystals are similar in size (10-50 nm) to what has been found in perovskite/CNT hybrid materials reported by Ka et al 30 To investigate the effect of visible light illumination on the nanotube-MAPbI 3 composite samples we performed spectroscopic measurements in the 500-15 000 cm −1 wavenumber range (0.06-1.85 eV). First, we were looking for indications of electronic interactions at the CNT/MAPbI 3 interface.…”

Ultrafast and broadband photodetectors based on a perovskite/organic bulk heterojunction for large-dynamic-range imaging

“…Organic-inorganic hybrid perovskites (OIHPs) are emerging materials that have been progressively enabling new thin-film optoelectronics, including solar cells [21][22][23][24][25][26][27] , light-emitting diodes 28,29 and photodetectors 14,16,[30][31][32][33][34][35][36] . The extensive application of hybrid perovskites can be attributable to their excellent optical and electrical properties, including a direct bandgap, large absorption coefficient, high carrier mobility, and low trap density [37][38][39][40] .…”

Recent progress in perovskite-based photodetectors: the design of materials and structures

“…Totally, efficient charge extraction and transport contributed to the fast response speed and a rise time of 16 μs. Ibrahima Ka research group [67] also incorporated single-wall carbon nanotubes (SWNT) within a perovskite matrix by means of a simple two-step method in ambient air. The photoconductive gain results confirmed that the perovskite dominated both the optical absorption and photogeneration, while the SWNT network greatly facilitated the separation, transport, and collection of the carrier.…”