Embedding of Ti₃C₂T_xNanocrystals in MAPbI₃Microwires for Improved Responsivity and Detectivity of Photodetector

Abstract

Organic–inorganic hybrid MAPbI3 microwires show unique optoelectronic properties for high performances of photodetectors (PDs). However, the defects‐assisted nonradiative recombination is harmful for carrier transport, which limits the performances improvement of MAPbI3 microwires PDs. Traditional organic passivation agents effectively combine the surface defects of microwires and also reduce the mobility of overall film based on the perovskite microwires. Therefore, the improvement of internal carrier transport of microwires and the mobility of integrated film simultaneously is a particular challenge for fabrication of performances enhanced perovskite microwires PDs. Here, the Ti3C2Tx NCs are fabricated by nonfocus laser irradiation in liquid environment, and hybrids the high conductive NCs in the MAPbI3 microwires. The presence of Ti3C2Tx NCs renders defects passivation, enhancement of crystalline orientation, charge transport, and carrier extraction for MAPbI3 microwires, and boots the mobility of microwires based film, leading to about tenfolds enhancement of performances of PDs than that of the control. The maximum responsivity and the detectivity of the Ti3C2Tx NCs embedded MAPbI3 microwires PDs reach to 1.70 A W−1 and 7.0 × 1011 Jones in visible window, respectively. The findings suggest that the laser generated high conductive Ti3C2Tx NCs is an effective additive for perovskite microwires to fabricate performances enhanced optoelectronics.

Spraying Perovskite Intermediate Enabling Inch‐Scale Microwire Film Fabrication for Integration Compatible Efficient‐Photodetectors Array

“…In the previous work, we reported that MAPbI 3 MWs could be easily obtained through this synthesis protocol. [18] In the present work, we found that the FAPbI 3 MWs intermediate is more sensitive to the volume ratio of DMF and IPA. As shown in Figure 1b and Figure S1 (Supporting Information), MAPbI 3 MWs intermediate formed immediately in the varied volume ratio of DMF and IPA in a large range (from 1:2 to 1:40), while the FAPbI 3 MWs intermediate only formed quickly in the range from 1:5 to 1:15.…”

“…Preparation of APbI 3 (A = FA + , MA + , and Cs + ) MWs: MAPbI 3 and FAPbI 3 MWs intermediate was synthesized by a modified process according to previous work. [18] 1 mmol PbI 2 powder (461.01 mg) was added into 1 mL of DMF solvent. Then it was heated to 70 °C and stirred on a hot plate for 30 min to fully dissolve the PbI 2 powder, which was served as solution A.…”

“…In this work, we fabricated MAPbI 3 and FAPbI 3 MWs in solution according to the literature [18] with some modifications, and the scheme of the fabrication procedure is shown in Figure 1a. The lead iodide (PbI 2 ) dissolved DMF was slowly injected into methanaminium iodide (MAI) or formamidinium iodide (FAI) contained isopropyl alcohol (IPA) solution with stirring under N 2 protection at room temperature.…”

Single-crystal MAPbI3 microwire arrays by a bilayer flexible interface confinement method for photodetectors

“…Their distinct geometric structures can not only facilitate efficient carrier transport due to the reduced dimensionality, but also tolerate bending along the perpendicular to form flexible and integrated devices. [19][20][21][22][23] Therefore, single-crystal microwires (MWs) are highly desirable for practical applications in optoelectronic devices.…”

A Thermal‐Pressed Strategy for Crystal Growth and Boundaries Self‐Fusion of Mixed‐Halide Perovskite Films against Halide Phase Segregation

“…The success of metal halide perovskite materials in the optoelectronic fields of solar cells, [1,2] photodetectors, [3,4] LEDs, [5] lasers [6,7] is often attributed to their excellent photoelectric properties, including high absorption coefficient, tunable bandgap, long exciton diffusion length, low exciton dissociation energy, and high defect tolerating feature. [8][9][10] However, the stateof-the-art perovskite-based devices are vulnerable to thermal and moisture, resulting in inferior stability inevitably.…”