High performance hybrid graphene–CsPbBr_3−xI_x perovskite nanocrystal photodetector

Abstract

We demonstrate a highly sensitive hybrid photodetector based on graphene–CsPbBr3−xIx perovskite nanocrystals.

Strategy to overcome recombination limited photocurrent generation in CsPbX3 nanocrystal arrays

“…However current transport experiments 21,22,23 from PNC-based devices have been performed on diode structures. 24,25 In such device geometries, the transport of the PNC layer is blurred with effects coming from the electron and hole extraction layers.…”

Recent Advances in Halide Perovskite Photodetectors Based on Different Dimensional Materials

“…CsPbBr 3− x I x and CsPbBr 3− x Cl x NCs can be obtained by halide exchange reactions between CsPbBr 3 NCs and lithium salts (LiCl or LiI). In the same group, Kwak et al prepared the graphene–CsPbBr 3− x I x perovskite NC‐based photodetector with high sensitive and demonstrated that the photoconductivity enhancement can be gained by introducing graphene with high carrier mobility. This hybrid photodetector exhibited an ultrahigh responsivity (8.2 × 10 8 A W −1 ) and an impressive detectivity (≈10 16 Jones) under 405 nm illumination (power, 0.07 mW cm −2 ).…”

“…And a photoresponsivity over 10 5 A W −1 was achieved in graphene/CsPbBr 3 /graphene‐based phototransistor with a vertical configuration. Lee and coworkers reported an all‐inorganic CsPbBr 3− x I x perovskites/graphene photodetector with a high responsivity of 8.2 × 10 8 A W −1 and an ultrahigh detectivity of 2.4 × 10 16 Jones under 405 nm illumination (power, 0.07 mW cm −2 ).…”

Constructing Mie‐Scattering Porous Interface‐Fused Perovskite Films to Synergistically Boost Light Harvesting and Carrier Transport

“…However,t he hybrid perovskites are quite sensitive to light, heat, and humidity,w hich greatly limited its further application for optoelectronics. [10] On the other hand, the succeeding all-inorganic perovskite CsPbX 3 (X = Cl, Br, I), which inherited the superiorities of organic-inorganic hybrid perovskites,are much more stable and thereby are outstanding candidates for optoelectronic devices.Since the first lightemitting diodes (LED) based on CsPbBr 3 quantum dots (QDs) was fabricated, [11] notable optoelectronic devices are springing up,such as solar cells, [12] CsPbX 3 nanocrystal PDs, [13] CsPb(Br/I) 3 nanorod PDs, [14] monolayer and few-layer nanosheets PDs, [15] self-healing PDs, [16] and plasmon enhanced PDs. [17] However, the performance of the PDs are generally low compared to single-crystal bulk materials.…”

“…Although the Mie porous structure significantly increased the LH ability of the films,t he electrical transport properties are not deteriorated and the porous PDs showed high photoconductive gain of 7.63 10 5 ,h igh on/off ratio of more than 10 4 and the peak EQE value of 658 %with abias of 9Vat 520 nm, which is quite extraordinary as compared to the previous report of the all-inorganic perovskite PDs. [13,16] This new pathway of fabricating porous and interface-fused structure films with high performance have potential applications not only in planar perovskite PDs,b ut also in other optoelectronic devices,s uch as light-emitting diodes (LED), solar cells,and thin film transistors.…”