Embedding of Ti3 C2 Tx Nanocrystals in MAPbI3 Microwires 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 Ti₃ C₂ T_x NCs are fabricated by nonfocus laser irradiation in liquid environment, and hybrids the high conductive NCs in the MAPbI₃ microwires. The presence of Ti₃ C₂ T_x 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 Ti₃ C₂ T_x 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 Ti₃ C₂ T_x NCs is an effective additive for perovskite microwires to fabricate performances enhanced optoelectronics.

Keywords: MAPbI 3 microwires; carrier transport; defects passivation; nanocrystals; photodetector.