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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.


Normalized light absorption of SnS2 reacted for different times. The inset gives the 12-h sample's absorption property in form of photon energy.
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Figure 3: Normalized light absorption of SnS2 reacted for different times. The inset gives the 12-h sample's absorption property in form of photon energy.

Mentions: The absorption spectra of SnS2 nano-particles in chlorobenzene are shown in Figure 3. SnS2 sample reacted for 0.25 h does not show an obvious absorption near its bandgap energy region. It is due to the presence of an amorphous precursor that is not crystallized. Samples at 2 and 5 h exhibit obvious absorption peaks at 450 nm, suggesting the formation of nano-particles. The absorption of SnS2 with a final reaction time of 12 h is a little intensified and shows a slight red-shift, which is caused by a enlarged particle size. From the absorption spectrum, the optical bandgap of SnS2 particles can be obtained which is shown as the inset in Figure 3. SnS2 nano-particles reacting for 12 h generated a band-gap value of about 2.66, 0.3 eV larger than its bulk phase due to the quantum size effect. The absorption properties of SnS2 and MDMO-PPV blends in chlorobenzene are given in Figure 4. It is simply a superposition of the respective absorption spectra of pure MDMO-PPV and SnS2 nano-particles at longer and shorter wavelength. The absorption of SnS2 at 450 nm in the blends is not obvious; this is probably due to its weaker absorbance comparing to MDMO-PPV. The introduction and increasing weight ratio of SnS2 in organic/inorganic hybrids cause more obvious absorption enhancement in ultra-violet region, mainly because of the intensive absorption property of nano-particles [20-22]. Although light absorption enhancement is commonly existed in organic-inorganic hybrid systems due to the introduction of inorganic nano-particles, its contribution to the photocurrent of hybrid solar cells is not confirmable because of many other caused variations such as excitons splitting and so on.


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)

Normalized light absorption of SnS2 reacted for different times. The inset gives the 12-h sample's absorption property in form of photon energy.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: Normalized light absorption of SnS2 reacted for different times. The inset gives the 12-h sample's absorption property in form of photon energy.
Mentions: The absorption spectra of SnS2 nano-particles in chlorobenzene are shown in Figure 3. SnS2 sample reacted for 0.25 h does not show an obvious absorption near its bandgap energy region. It is due to the presence of an amorphous precursor that is not crystallized. Samples at 2 and 5 h exhibit obvious absorption peaks at 450 nm, suggesting the formation of nano-particles. The absorption of SnS2 with a final reaction time of 12 h is a little intensified and shows a slight red-shift, which is caused by a enlarged particle size. From the absorption spectrum, the optical bandgap of SnS2 particles can be obtained which is shown as the inset in Figure 3. SnS2 nano-particles reacting for 12 h generated a band-gap value of about 2.66, 0.3 eV larger than its bulk phase due to the quantum size effect. The absorption properties of SnS2 and MDMO-PPV blends in chlorobenzene are given in Figure 4. It is simply a superposition of the respective absorption spectra of pure MDMO-PPV and SnS2 nano-particles at longer and shorter wavelength. The absorption of SnS2 at 450 nm in the blends is not obvious; this is probably due to its weaker absorbance comparing to MDMO-PPV. The introduction and increasing weight ratio of SnS2 in organic/inorganic hybrids cause more obvious absorption enhancement in ultra-violet region, mainly because of the intensive absorption property of nano-particles [20-22]. Although light absorption enhancement is commonly existed in organic-inorganic hybrid systems due to the introduction of inorganic nano-particles, its contribution to the photocurrent of hybrid solar cells is not confirmable because of many other caused variations such as excitons splitting and so on.

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.