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Van der Waals Multi‐Heterostructures (PN, PIN, and NPN) for Dynamic Rectification in 2D Materials
Author(s) -
Aftab Sikandar,
Ul Haq Hafiz Mansoor,
Yousuf Saqlain,
Khan Muhammad Usman,
Ahmed Zaheer,
Aziz Jamal,
Iqbal Muhammad Waqas,
ur Rehman Atteq,
Iqbal Muhammad Zahir
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202001479
Subject(s) - rectification , materials science , heterojunction , van der waals force , diode , optoelectronics , stacking , exfoliation joint , nanotechnology , voltage , electrical engineering , graphene , nuclear magnetic resonance , physics , engineering , quantum mechanics , molecule
Here, van der Waals multi‐heterojunctions (PN, NP, PIN, and NPN) are fabricated by stacking of MoTe 2 , hexagonal boron nitride (h‐BN), and MoSe 2 nanoflakes using a mechanical‐exfoliation technique where the dynamic rectification is examined. Low‐resistance metal contacts Al/Au and Pt/Au are applied to MoSe 2 and MoTe 2 , respectively, and gate‐dependent rectifying behavior is achieved, with a rectification ratio of up to 10 5 in PN devices. It is found that the performance of the device is enhanced by placing an interfacial layer h‐BN between two opposite layers of 2D materials where the rectification ratio is found to be >10 6 with the ideality factor ≈1.3 in the PIN devices. Also, using the conventional Richardson's plot, the barrier heights of PN and PIN diodes are calculated to be 260 and 490 meV at zero gate bias, respectively. As well, the devices exhibit good performance with a built‐in electric field observed in both PN and PIN diodes, which gives rise to an open‐circuit voltage ( V oc ) and short‐circuit current ( I sc ) under zero external bias. Remarkably, it is found that the performance of the devices also gets better by forming double heterojunction (NPN) layer than PN or NP layers. The device is also tested for a rectification application, and it successfully rectifies an input alternating‐current signal. These findings are important for the development of nano‐ and optoelectronics devices.