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

Abstract Organic–inorganic hybrid MAPbI₃microwires 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 MAPbI₃microwires 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 Ti₃C₂T_xNCs are fabricated by nonfocus laser irradiation in liquid environment, and hybrids the high conductive NCs in the MAPbI₃microwires. The presence of Ti₃C₂T_xNCs renders defects passivation, enhancement of crystalline orientation, charge transport, and carrier extraction for MAPbI₃microwires, 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 Ti₃C₂T_xNCs embedded MAPbI₃microwires PDs reach to 1.70 A W⁻¹and 7.0 × 10¹¹Jones in visible window, respectively. The findings suggest that the laser generated high conductive Ti₃C₂T_xNCs is an effective additive for perovskite microwires to fabricate performances enhanced optoelectronics.