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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.


AFM images of hybrid films (1 μm × 1 μm) with 50 wt% SnS2. (A) phase image of referenced MDMO-PPV film, (B) phase image of hybrid film with as-synthesized SnS2 particles, (C) phase image of hybrid film containing pyridine treated SnS2 particles, and (D) phase image of MDMO-PPV:pyridine-SnS2 film after annealing. (a)-(d) are the corresponding heitht images of (A)-(D). The scale bar in the height image indicates 40 nm.
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Figure 9: AFM images of hybrid films (1 μm × 1 μm) with 50 wt% SnS2. (A) phase image of referenced MDMO-PPV film, (B) phase image of hybrid film with as-synthesized SnS2 particles, (C) phase image of hybrid film containing pyridine treated SnS2 particles, and (D) phase image of MDMO-PPV:pyridine-SnS2 film after annealing. (a)-(d) are the corresponding heitht images of (A)-(D). The scale bar in the height image indicates 40 nm.

Mentions: To study the effect of surfactant on the photovoltaic performance, solar cells with and without pyridine treatment are fabricated and characterized. Also researched is the MDMO-PPV:pyridine-SnS2 solar cell annealed at an optimized temperature of 150°C. The performances of solar cells with the same SnS2 weight ratio of 50% in the three devices are shown in Figure 8. All the solar cells exhibit good diode behaviors in dark. Compared with the cell without pyridine treating, solar cell with pyridine exchange shows enhanced short circuit current density from 0.65 to 0.73 mA/cm2 while keeping the open circuit voltage and fill factor nearly the same, about 0.88 V and 0.4, respectively. The Jsc exhibits further enhancement up to 0.88 mA/cm2 through annealing. The opti-electric transformation efficiency of solar cell with pyridine is 0.263%, larger than that without pyridine, 0.204%, and this parameter goes up to 0.31% when the device with pyridine was annealed. The increasing in photocurrent upon surfactant exchange can be explained that charge transfer process at the interface of MDMO-PPV and SnS2 could be more suited to happen, followed by a convenient free electrons transport among SnS2 particles because of the benzene ring and small size of the pyridine molecule. However, an additional dominant reason that induces the Jsc enhancement after annealing might be optimized organic and inorganic phase separation as well as continuous electron transport through compact SnS2 connections after the remain solvent's elimination. This can be demonstrated by characterizing the surface morphology of different hybrid films, which are shown in Figure 9.


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)

AFM images of hybrid films (1 μm × 1 μm) with 50 wt% SnS2. (A) phase image of referenced MDMO-PPV film, (B) phase image of hybrid film with as-synthesized SnS2 particles, (C) phase image of hybrid film containing pyridine treated SnS2 particles, and (D) phase image of MDMO-PPV:pyridine-SnS2 film after annealing. (a)-(d) are the corresponding heitht images of (A)-(D). The scale bar in the height image indicates 40 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 9: AFM images of hybrid films (1 μm × 1 μm) with 50 wt% SnS2. (A) phase image of referenced MDMO-PPV film, (B) phase image of hybrid film with as-synthesized SnS2 particles, (C) phase image of hybrid film containing pyridine treated SnS2 particles, and (D) phase image of MDMO-PPV:pyridine-SnS2 film after annealing. (a)-(d) are the corresponding heitht images of (A)-(D). The scale bar in the height image indicates 40 nm.
Mentions: To study the effect of surfactant on the photovoltaic performance, solar cells with and without pyridine treatment are fabricated and characterized. Also researched is the MDMO-PPV:pyridine-SnS2 solar cell annealed at an optimized temperature of 150°C. The performances of solar cells with the same SnS2 weight ratio of 50% in the three devices are shown in Figure 8. All the solar cells exhibit good diode behaviors in dark. Compared with the cell without pyridine treating, solar cell with pyridine exchange shows enhanced short circuit current density from 0.65 to 0.73 mA/cm2 while keeping the open circuit voltage and fill factor nearly the same, about 0.88 V and 0.4, respectively. The Jsc exhibits further enhancement up to 0.88 mA/cm2 through annealing. The opti-electric transformation efficiency of solar cell with pyridine is 0.263%, larger than that without pyridine, 0.204%, and this parameter goes up to 0.31% when the device with pyridine was annealed. The increasing in photocurrent upon surfactant exchange can be explained that charge transfer process at the interface of MDMO-PPV and SnS2 could be more suited to happen, followed by a convenient free electrons transport among SnS2 particles because of the benzene ring and small size of the pyridine molecule. However, an additional dominant reason that induces the Jsc enhancement after annealing might be optimized organic and inorganic phase separation as well as continuous electron transport through compact SnS2 connections after the remain solvent's elimination. This can be demonstrated by characterizing the surface morphology of different hybrid films, which are shown in Figure 9.

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.