Abstract
Two-dimensional (2D) tungsten diselenide (WSe2) has attracted considerable attention in the field of photovoltaic devices owing to its excellent structure and photoelectric properties, such as ordered 2D network structure, high electrical conductivity, and high mobility. For this test, we firstly prepared different sizes (NS1–NS3) of WSe2 nanosheets (NSs) through the ultrasonication method and characterized their structures using the field emission scanning electron microscope (FE-SEM), Raman spectroscopy, and X-ray powder diffraction. Moreover, we investigated the photovoltaic performance of polymer solar cells based on 5,7-Bis(2-ethylhexyl)benzo[1,2-c:4,5-c′]dithiophene-4,8-dione(PBDB-T):(6,6)-phenyl-C71 butyric acid methyl ester (PCBM) with different WSe2 NSs as the active layer. The fabricated PBDB-T:PCBM active layer with the addition of NS2 WSe2 NSs (1.5 wt%) exhibited an improved power conversion efficiency (PCE) of 9.2%, which is higher than the pure and NS1 and NS3 WSe2 blended active layer-encompassing devices. The improved PCE is attributed to the synergic enhancement of exciton dissociation and an improvement in the charge mobility through the modified active layer for polymer solar cells. Furthermore, the highest sensitivity of 2.97 mA/Gy·cm2 was achieved for the NS2 WSe2 NSs blended active layer detected by X-ray exposure over the pure polymer, and with the NS1 and NS2 WSe2 blended active layer. These results led to the use of transition metal dichalcogenide materials in polymer solar cells and X-ray detectors.
Highlights
The impact of the incorporation of WSe2 NSs with an active layer on the photovoltaic and photodetector performances of indium tin oxide (ITO)/PEDOT:PSS/PBDB-T:phenyl-C71 butyric acid methyl ester (PCBM):WSe2/lithium fluoride (LiF)/Al device was measured by current density−voltage (J−V) characteristics
Using a polymer solar cells (PSC) device, we showed that the pristine PBDB-T:PCBM active layer displayed a short-circuit current density (Jsc) of 16.81 mA·cm2 and an open-circuit voltage (Voc) 0.84 V, with a fill factor (FF) of 56% and series resistance (Rs) of 225.43 Ω·cm2, resulting in a power conversion efficiency (PCE) of 8.1%
The different types (NS1-NS3) of WSe2 NSs were incorporated with active layers to explore their potentials to alter the electron transport behavior in the prepared devices
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The PCE enhancements in the ternary hybrid layers are mainly due to their enriched capacity for light absorption and their harmonizing absorption of solar radiation [33,34] In this respect, interest in ternary-based research has grown recently in order to improve the photovoltaic performance of PSCs. X-rays have been widely used in the detection of indirect/direct methods and have a wide range of application prospects, including industrial inspection, scientific research (crystallography) and in the field of medicine [35,36,37,38,39].
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