Abstracts Book - IMRC 2018

• SC4-P011
MOLYBDENUM SULFIDE NANOSTRUCTURES SYNTHESIZED BY
HYDROTHERMAL METHOD FOR HYBRID SOLAR CELLS
APPLICATION
Claudia Martinez Alonso 1 , Arizbeth Vianey Andrade Lobatón 1 , Gildardo Casarrubias Segura 2 ,
Ma. Concepción Arenas 1
1
Escuela Nacional de Estudios Superiores de la UNAM unidad León, Laboratorio de
Investigación Interdisciplinaria, Mexico. 2 Instituto de EnergÍas Renovables Universidad
Nacional Autónoma de México, NA, Mexico.
Molybdenum sulfide (MoS2) is a 2D semiconductor consisting of hexagonal
molybdenum sheets (Mo) interspersed between two hexagonal sheets of sulfur
(S), covalent bonds exist between the layers of S-Mo-S and the adjacent layers
are held together by interactions of Van der Waals. It has an energy gap that
ranges between 1-2 eV, high load mobility between 200-500 cm 2 V -1 s -1 and high
absorption coefficient (> 105 cm -1 ), properties that allow it to be used in solar
cells low-cost as absorber material, sensitizer or hole extractors. There are a
variety of methods of synthesis by chemical solution to synthesize MoS2
nanostructure, such as, solvothermal / hydrothermal, heating by microwave or
chemical precipitation, among others. The chemical solution methods are
economical and with them high-quality nanostructures can be obtained,
allowing the modification of their properties by varying synthesis parameters. In
this work, MoS2 nanostructures were synthesized hydrothermal methods.
Ammonium molybdate ((NH4)6Mo7O24) and molybdenum oxide (MoO3) were
used as molybdenum source, thiourea (TU) and thioacetamide (TA) as sulfur
source. The temperature of synthesis was 220°C and the reaction time was 6
hours, water was used as a solvent. By XRD the presence of a crystalline phase
mixture of rhombohedra (3R) and hexagonal (2H) MoS2 was observed. By TEM
nanosheets agglomerate was observed. Raman spectroscopy showed a
characteristic peaks for the E 1 2g mode at 376 cm -1 and the A1g mode at 410 cm -
1 . After the characterization, the MoS2 nanostructures were applied in hybrid
solar cells as an absorber-sensitizer material. The structure of the cell was
TCO/compact-TiO2/mesoporous-TiO2/MoS2/P3HT/C/Au. The preliminary results
suggested that the improved external quantum efficiency of the cells with MoS2
nanostructures, compared to those without them, should come good properties
of the MoS2 nanostructures as a absorber material. A major control on MoS2
morphology is necessary to improve the photovoltage and fill factor of the
mentioned solar cells.