Abstract
We demonstrate 2D-layered semiconductor tungsten disulfide (WS2) nanoflakes as an efficient photoactive material in bulk heterojunction (BHJ) solar cells. WS2 nanoflakes-coated titanium dioxide (TiO2) nanoparticles layer serves as the electron acceptor with poly(3-hexylthiophene) (P3HT) as the hole conductor. The UV–visible spectroscopic measurement yields an optical bandgap of ∼1.7eV for the WS2 nanoflakes, confirming the presence of mixed monolayer/few-layers stack. Raman spectra of the WS2-coated TiO2 show a dominant peak at 140cm−1 for anatase TiO2, whereas peaks at 350cm−1 (in-plane vibration mode) and 420cm−1 (out-of-plane vibration mode) denote the signature of WS2 nanoflakes. Photovoltaic performance, electron transport, and recombination at TiO2/WS2/P3HT interfaces are explored through trap-assisted Shockley–Read–Hall model to elucidate WS2 as a potential material candidate for efficient solar energy harvesting.
Published Version
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