Limits...
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.


Photovoltaic performance of MDMO-PPV:SnS2 hybrid solar cells. (a) Jsc (red) and Voc (black) versus wt% SnS2. (b) FF (black) and Eff (red) versus wt% SnS2. SnS2 particles in these solar cells were treated with pyridine before use.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211364&req=5

Figure 7: Photovoltaic performance of MDMO-PPV:SnS2 hybrid solar cells. (a) Jsc (red) and Voc (black) versus wt% SnS2. (b) FF (black) and Eff (red) versus wt% SnS2. SnS2 particles in these solar cells were treated with pyridine before use.

Mentions: Detailed influence of pyridine-processed SnS2 concentration in the hybrid film on the photovoltaic performance is given in Figure 7 in which several characteristics can be noted. Figure 7a shows that current density (Jsc) initially increases with increasing amount of SnS2, reaches the maximum at 50 wt% SnS2, and then decreases with further increasing the SnS2 concentration. This trend might be related to the increased formation of free charges inferred from the PL quenching and/or the formation of more percolation pathways of SnS2 particles that facilitate electrons transport at initial amount increasing of SnS2 [25]. On the other hand, high SnS2 concentrations may induce large-scale phase separation due to particles aggregation [26], so that the donor-acceptor contact is affected, which is deleterious to device photocurrent. The open circuit voltage (Voc) decreases slightly when the amount of SnS2 increases. This might be due to the formation of shunts that may conduct charges from electrode to electrode. This likelihood increases once increasing the SnS2 concentration. Generally, the value of fill factor (FF) is enlarged from 0.23 to 0.45 by increasing the amount of SnS2 in the blend. This trend can be analyzed by reasoning that FF is a measure for the balance between free electrons and holes transport. While keeping the polymer concentration unchanged, increasing the SnS2 concentration will increase the electrons transport efficiency so that more balanced charge transportation is achieved. The overall trend, when all parameters are combined into the transversion efficiency (Eff) is that it reaches the largest of about 0.26% at 50 wt% SnS2 concentration. This concentration is different from the optimal amounts required for ZnO in MDMO-PPV:ZnO blends (67%) [6] and CdSe in PCPDTBT:CdSe blends (90%) [3]. From the curve shape, we can see that the efficiency variation is derived mostly by photocurrent.


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)

Photovoltaic performance of MDMO-PPV:SnS2 hybrid solar cells. (a) Jsc (red) and Voc (black) versus wt% SnS2. (b) FF (black) and Eff (red) versus wt% SnS2. SnS2 particles in these solar cells were treated with pyridine before use.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 7: Photovoltaic performance of MDMO-PPV:SnS2 hybrid solar cells. (a) Jsc (red) and Voc (black) versus wt% SnS2. (b) FF (black) and Eff (red) versus wt% SnS2. SnS2 particles in these solar cells were treated with pyridine before use.
Mentions: Detailed influence of pyridine-processed SnS2 concentration in the hybrid film on the photovoltaic performance is given in Figure 7 in which several characteristics can be noted. Figure 7a shows that current density (Jsc) initially increases with increasing amount of SnS2, reaches the maximum at 50 wt% SnS2, and then decreases with further increasing the SnS2 concentration. This trend might be related to the increased formation of free charges inferred from the PL quenching and/or the formation of more percolation pathways of SnS2 particles that facilitate electrons transport at initial amount increasing of SnS2 [25]. On the other hand, high SnS2 concentrations may induce large-scale phase separation due to particles aggregation [26], so that the donor-acceptor contact is affected, which is deleterious to device photocurrent. The open circuit voltage (Voc) decreases slightly when the amount of SnS2 increases. This might be due to the formation of shunts that may conduct charges from electrode to electrode. This likelihood increases once increasing the SnS2 concentration. Generally, the value of fill factor (FF) is enlarged from 0.23 to 0.45 by increasing the amount of SnS2 in the blend. This trend can be analyzed by reasoning that FF is a measure for the balance between free electrons and holes transport. While keeping the polymer concentration unchanged, increasing the SnS2 concentration will increase the electrons transport efficiency so that more balanced charge transportation is achieved. The overall trend, when all parameters are combined into the transversion efficiency (Eff) is that it reaches the largest of about 0.26% at 50 wt% SnS2 concentration. This concentration is different from the optimal amounts required for ZnO in MDMO-PPV:ZnO blends (67%) [6] and CdSe in PCPDTBT:CdSe blends (90%) [3]. From the curve shape, we can see that the efficiency variation is derived mostly by photocurrent.

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.