Enhanced Photodetection Performance of an In Situ Core/Shell Perovskite-MoS<sub>2</sub> Phototransistor
Jinwoo Sim, Sunggyu Ryoo, Joo Sung Kim, Juntae Jang, Heebeom Ahn, Donguk Kim, Joonha Jung, Taehyun Kong, Hyeonmin Choi, Yun Seog Lee, Tae‐Woo Lee, Kyungjune Cho, Keehoon Kang, Takhee Lee
Abstract
While two-dimensional transition metal dichalcogenides (TMDCs)-based photodetectors offer prospects for high integration density and flexibility, their thinness poses a challenge regarding low light absorption, impacting photodetection sensitivity. Although the integration of TMDCs with metal halide perovskite nanocrystals (PNCs) has been known to be promising for photodetection with a high absorption coefficient of PNCs, the low charge mobility of PNCs delays efficient photocarrier injection into TMDCs. In this study, we integrated MoS 2 with in situ formed core/shell PNCs with short ligands that minimize surface defects and enhance photocarrier injection. The PNCs/MoS 2 heterostructure efficiently separates electrons and holes by establishing type II band alignment and consequently inducing a photogating effect. The synergistic interplay between photoconductive and photogating effects yields a high responsivity of 2.2 × 10 6 A/W and a specific detectivity of 9.0 × 10 11 Jones. Our findings offer a promising pathway for developing low-cost, high-performance phototransistors leveraging the advantages of two-dimensional (2D) materials.