Publication date: 1 June 2017
Source:Thin Solid Films, Volume 631
Author(s): Firoz Alam, Neetesh Kumar, Viresh Dutta
Surfactant free lead sulfide (PbS) nanoparticles (NPs) had been synthesized by precipitation method using lead acetate and thiourea as precursor. Mechanical grinding using mortar pestle has been done to deagglomerate the NPs to obtain finer nanoparticles. Ground NPs were further sonicated using high power probe sonicator in chlorobenzene solution. The poly(3-hexylthiophene-2,5-diyl) (P3HT) polymer was added into the chlorobenzene solution containing well dispersed PbS quantum dots (QDs). The blends solution containing PbS QDs and P3HT polymer was spin coated at different rotation per minute to obtain an optimum thickness for efficient hybrid solar cells fabrication. Scanning electron microscopy, atomic force microscopy and transmission electron microscopy analysis showed a homogeneous distribution of PbS QDs in the P3HT matrix. Photoluminescence (PL) measurements performed on the blends solution showed strong PL quenching, which was very much dependent on the PbS QDs concentration, indicating that proper photoinduced electron and hole transfer occurred in PbS:P3HT blend. Hybrid solar cells with configuration indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)/PbS:P3HT/Al had been fabricated with different active layer thicknesses. The device with optimum thickness showed the highest efficiency of 1.75% under Air Mass 1.5G illumination with the irradiation of 100
Source:Thin Solid Films, Volume 631
Author(s): Firoz Alam, Neetesh Kumar, Viresh Dutta