MoS2 / TiO2 nanoparticle composite bulk heterojunction solar cell
- Resource Type
- Conference
- Authors
- Shanmugam, Mariyappan; Bansal, Tanesh; Durcan, Chris A.; Bin Yu
- Source
- 2012 12th IEEE International Conference on Nanotechnology (IEEE-NANO) Nanotechnology (IEEE-NANO), 2012 12th IEEE Conference on. :1-4 Aug, 2012
- Subject
- Components, Circuits, Devices and Systems
Power, Energy and Industry Applications
Indium tin oxide
Gold
Photovoltaic cells
Glass
- Language
- ISSN
- 1944-9399
We investigate hybrid bulk heterojunction (BHJ) solar cell employing layered transition-metal-dichalcogenide molybdenum disulfide (MoS 2 ) as photon harvesting layer with titanium dioxide (TiO 2 ) as electron acceptor and poly 3-hexylthiophene (P3HT) as hole conductor. Micro-Raman spectroscopic measurement confirms that MoS 2 coated on porous TiO 2 film consist nanoflakes of monolayer/few layers in the stack. The semiconducting anatase phase of TiO 2 is confirmed by a signature peak at 146 cm −1 , with two other peaks at 383 cm −1 and 407 cm −1 corresponding to MoS 2 in the film. The BHJ solar cell having a stacked structure of ITO/TiO 2 /MoS 2 /P3HT/Au showed a short circuit current density of 4.7 mA/cm 2 , open circuit voltage of 560 mV, and photoconversion efficiency of 1.3% under an illumination of 100 mW/cm 2 . The external quantum efficiency of the BHJ solar cell confirms that MoS 2 nanoflakes absorb solar photons in a wavelength range of 350 nm ∼ 800 nm. Dark current-voltage characteristics of the BHJ solar cell under low and medium forward bias regions suggest that electron recombination at TiO 2 /MoS 2 /P3HT interfaces limits photovoltaic performance of the device.