Abstract
Van der Waals p-n heterojunctions, consist of atomically thin two-dimensional (2D) layer semiconductors, have opened a promising avenue for the realization of ultrathin and ultralight photovoltaic solar cells. This feature enables them particularly be suitable as the micro/nanoscale solar energy-conversion units integrated in wireless power supply micro/nano-systems. However, solar energy harvest in these heterojunctions is hindered by inherent weak interlayer interaction at such ultrathin thickness. Herein, a novel integrated strategy by embedding metallic plasmonic pentamers optical nano-antenna array (ONAA) onto overlap region of black phosphorus-molybdenum disulfide (BP-MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) p-n heterojunction is firstly exploited under both a near-infrared laser (λ = 830 nm) and standardized AM1.5G solar irradiation. Results show that profiting from plasmon-induced “hot” electrons and thermal field generating from gigantic near-field enhancement in 15 nm-ultrashort nanogap ONAAs and high intrinsic build-in field in atomically overlap region, this integrated configuration displays enhanced photovoltaic properties. Maximum short-circuits current (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sc</sub> = 0.53 μA) and open circuit voltage (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">oc</sub> = 0.2 V) had been attained. Additional fill factor of 14% and double power conversion efficiencies amplification are measured via comparison of device without/with ONAAs. These findings strongly demonstrate this reliable enhancement strategy with integration of plasmonic physics into 2D heterojunctions for realizing energy harvesting unit in the wireless power supply micro/nano-systems.
Highlights
As the discovery of photovoltaic (PV) effects, converting sunlight into an electron current in a semiconductor material [1], PV cells have already become an impactful power system in practical aspects [2]
RAMAN CHARACTERIZATION OF black phosphorous (BP)/MOS2 HETEROJUNCTION WITH/WITHOUT optical nano-antenna array (ONAA) Raman spectroscopy has been demonstrated as a reliable tool to characterize the phonon behaviors or interlayer interaction among heterostructures [57]
We carried out a detailed comparison of Raman-active modes of MoS2 and BP at the overlap region with and without ONAAs
Summary
As the discovery of photovoltaic (PV) effects, converting sunlight into an electron current in a semiconductor material [1], PV cells (commonly known as solar cell) have already become an impactful power system in practical aspects [2]. Compared with the traditionally commercial solar cell [3]–[15], van der Waals p-n heterojunctions based on atomically thin 2D layered semiconductors, as a novel solar cell configuration, have opened a promising avenue for the realization of ultrathin and ultralight solar cells. The demonstration of nanoscale solar energy conversion and realization of sensing and energy harvesting in these solar cell configurations make them hold tremendous application potential in specific wireless power supply micro/nano-systems [11], [12]. Van der Waals heterostructures devices with ultrathin and ultralight features are much suitable for the application where the weight and dimension consideration are essential in the future integrated micro/nano systems [13]–[15].
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