Sim, Jinwoo Ryoo, Sunggyu Kim, Joo Sung Jang, Juntae Ahn, Heebeom Kim, Donguk Jung, Joonha Kong, Taehyun Choi, Hyeonmin Lee, Yun Seog Lee, Tae-Woo Cho, Kyungjune Kang, Keehoon Lee, Takhee 2024-07-04T06:30:31Z 2024-07-04T06:30:31Z 2024-07-04 2024-07 1936-0851 https://pubs.kist.re.kr/handle/201004/150183 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 MoS2 with in situ formed core/shell PNCs with short ligands that minimize surface defects and enhance photocarrier injection. The PNCs/MoS2 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 x 10(6) A/W and a specific detectivity of 9.0 x 10(11) Jones. Our findings offer a promising pathway for developing low-cost, high-performance phototransistors leveraging the advantages of two-dimensional (2D) materials. English American Chemical Society Enhanced Photodetection Performance of an In Situ Core/Shell Perovskite-MoS2 Phototransistor Article 10.1021/acsnano.4c02775 1 ACS Nano, v.18, no.26, pp.16905 - 16913 ACS Nano 18 26 16905 16913 N scie scopus 001252924000001 2-s2.0-85196873325 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article GAIN MECHANISMS heterostructure phototransistor perovskite nanocrystal transition metal dichalcogenide photoconductive effect photogating effect