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Preparation of SnS2 colloidal quantum dots and their application in organic/inorganic hybrid solar cells.

Tan F, Qu S, Wu J, Liu K, Zhou S, Wang Z - Nanoscale Res Lett (2011)

Bottom Line: Photoluminescence measurement has been performed to study the surfactant effect on the excitons splitting process.The photocurrent of solar cells with the hybrid depends greatly on the ligands exchange as well as the device heat treatment.AFM characterization has demonstrated morphology changes happening upon surfactant replacement and annealing, which can explain the performance variation of hybrid solar cells.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P,O, Box 912, Beijing 100083, PR China. qsc@semi.ac.cn.

ABSTRACT
Dispersive SnS2 colloidal quantum dots have been synthesized via hot-injection method. Hybrid photovoltaic devices based on blends of a conjugated polymer poly[2-methoxy-5-(3",7"dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) as electron donor and crystalline SnS2 quantum dots as electron acceptor have been studied. Photoluminescence measurement has been performed to study the surfactant effect on the excitons splitting process. The photocurrent of solar cells with the hybrid depends greatly on the ligands exchange as well as the device heat treatment. AFM characterization has demonstrated morphology changes happening upon surfactant replacement and annealing, which can explain the performance variation of hybrid solar cells.

No MeSH data available.


TEM images of SnS2 particles reacted for different times. (a) 0.25 h, (b) 5 h, (c) 12 h, and (d) 30 h. Scale bars in the images are 50 nm.
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Figure 1: TEM images of SnS2 particles reacted for different times. (a) 0.25 h, (b) 5 h, (c) 12 h, and (d) 30 h. Scale bars in the images are 50 nm.

Mentions: The TEM images and SEAD measurement of SnS2 nano-particles distilled at different reaction times are shown in Figure 1. Corresponding to morphology in Figure 1a, SEAD in Figure 1 (1) exhibits an amorphous phase and the beginning reaction. It turns to a formation of polycrystalline when further increasing reaction time, and then again, amorphization formed. It reveals such a reaction process as precursor decomposition (Figure 1a) followed by quantum dot precipitation (Figure 1b,c) and then redissolving into the solution (Figure 1d). In fact, after the TAA-OLA solution was injected, a phenomenon was observed that the reaction mixture first turned from turbid orange to semi-transparent yellow and then becomes clearly transparent yellow. When the reaction temperature was increased, just less time was needed for this variation. It can be seen from Figure 1 that an optimal reaction for SnS2 colloidal quantum dots was happened at 12 h, which generated a dispersive SnS2 quantum dot about 5-7 nm in size. The crystalline phase of SnS2 particles is demonstrated by XRD in Figure 2 from which the crystalline transformation process can also be observed. All the characteristic diffraction peaks corresponding to a berndtite-4 type (PDF card 21-1231) appear when the reaction persists for 12 h. Nano-size of SnS2 at this time is about 5.3 nm, which is obtained from the Scherrer equation D = K λ/β cos θ where D is the diameter of the synthesized crystals, β is the full-width half-maximum, and θ is the diffraction angle. Further reaction up to 30 h caused dissolving of SnS2 particles through forming coordinated organic compound with OLA. Thus, diffraction signal mainly demonstrate an amorphous phase in the longer time reacted product.


Preparation of SnS2 colloidal quantum dots and their application in organic/inorganic hybrid solar cells.

Tan F, Qu S, Wu J, Liu K, Zhou S, Wang Z - Nanoscale Res Lett (2011)

TEM images of SnS2 particles reacted for different times. (a) 0.25 h, (b) 5 h, (c) 12 h, and (d) 30 h. Scale bars in the images are 50 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211364&req=5

Figure 1: TEM images of SnS2 particles reacted for different times. (a) 0.25 h, (b) 5 h, (c) 12 h, and (d) 30 h. Scale bars in the images are 50 nm.
Mentions: The TEM images and SEAD measurement of SnS2 nano-particles distilled at different reaction times are shown in Figure 1. Corresponding to morphology in Figure 1a, SEAD in Figure 1 (1) exhibits an amorphous phase and the beginning reaction. It turns to a formation of polycrystalline when further increasing reaction time, and then again, amorphization formed. It reveals such a reaction process as precursor decomposition (Figure 1a) followed by quantum dot precipitation (Figure 1b,c) and then redissolving into the solution (Figure 1d). In fact, after the TAA-OLA solution was injected, a phenomenon was observed that the reaction mixture first turned from turbid orange to semi-transparent yellow and then becomes clearly transparent yellow. When the reaction temperature was increased, just less time was needed for this variation. It can be seen from Figure 1 that an optimal reaction for SnS2 colloidal quantum dots was happened at 12 h, which generated a dispersive SnS2 quantum dot about 5-7 nm in size. The crystalline phase of SnS2 particles is demonstrated by XRD in Figure 2 from which the crystalline transformation process can also be observed. All the characteristic diffraction peaks corresponding to a berndtite-4 type (PDF card 21-1231) appear when the reaction persists for 12 h. Nano-size of SnS2 at this time is about 5.3 nm, which is obtained from the Scherrer equation D = K λ/β cos θ where D is the diameter of the synthesized crystals, β is the full-width half-maximum, and θ is the diffraction angle. Further reaction up to 30 h caused dissolving of SnS2 particles through forming coordinated organic compound with OLA. Thus, diffraction signal mainly demonstrate an amorphous phase in the longer time reacted product.

Bottom Line: Photoluminescence measurement has been performed to study the surfactant effect on the excitons splitting process.The photocurrent of solar cells with the hybrid depends greatly on the ligands exchange as well as the device heat treatment.AFM characterization has demonstrated morphology changes happening upon surfactant replacement and annealing, which can explain the performance variation of hybrid solar cells.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P,O, Box 912, Beijing 100083, PR China. qsc@semi.ac.cn.

ABSTRACT
Dispersive SnS2 colloidal quantum dots have been synthesized via hot-injection method. Hybrid photovoltaic devices based on blends of a conjugated polymer poly[2-methoxy-5-(3",7"dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) as electron donor and crystalline SnS2 quantum dots as electron acceptor have been studied. Photoluminescence measurement has been performed to study the surfactant effect on the excitons splitting process. The photocurrent of solar cells with the hybrid depends greatly on the ligands exchange as well as the device heat treatment. AFM characterization has demonstrated morphology changes happening upon surfactant replacement and annealing, which can explain the performance variation of hybrid solar cells.

No MeSH data available.