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.
Highlights
Today, a proven strategy to procure better low cost materials is the combination of different nanomaterials[1,2,3,4,5,6,7]
We report on introducing nanotubes within a perovskite matrix using a facile and highly-reproducible two-step process to synthesize a hybrid film based on a combination of single-wall carbon nanotubes (SWCNTs) and CH3NH3PbI3−xClx (MAPbI3−xClx) perovskite
Previous works on perovskite photodetectors[1,2,3,4]. These spectacular performances stem from the synergetic contributions of the SWCNTs and the perovskite matrix to significantly improve the overall properties of the hybrid material compared to the bulk perovskite films
Summary
Synthesis and characterization of the nano-engineered SWCNT/perovskite hybrid materials. By using a nanosecond pulsed laser as photo-generation source, we compared the photocurrent decays of our optimized hybrid device and the device with highest density of SWCNTs. The inset of Fig. 4c shows the transient response of the photodetectors under pulsed laser illumination. The PG spectrum confirms that the perovskite dominates both the optical absorption and photo-generation, while the SWNT network greatly facilitates carrier separation, transport and collection Based on these results, our photodetectors can potentially deliver a maximum photoconductive gain of 105, which is two orders of magnitude higher than the highest photoconductive gain reported, even for a bare perovskite phototransistor made with single-crystalline perovskite[19]. This indicates the significant advantages of using carbon nanotubes to enhance the performance of perovskite-based devices and the potential to transform perovskite-based light-harvesting devices
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