Enhanced Photodetection Performance of an In Situ Core/Shell Perovskite-MoS2 Phototransistor

Authors
Sim, JinwooRyoo, SunggyuKim, Joo SungJang, JuntaeAhn, HeebeomKim, DongukJung, JoonhaKong, TaehyunChoi, HyeonminLee, Yun SeogLee, Tae-WooCho, KyungjuneKang, KeehoonLee, Takhee
Issue Date
2024-07
Publisher
American Chemical Society
Citation
ACS Nano, v.18, no.26, pp.16905 - 16913
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 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.
Keywords
GAIN; MECHANISMS; heterostructure phototransistor; perovskite nanocrystal; transition metal dichalcogenide; photoconductive effect; photogating effect
ISSN
1936-0851
URI
https://pubs.kist.re.kr/handle/201004/150183
DOI
10.1021/acsnano.4c02775
Appears in Collections:
KIST Article > 2024
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