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RISS 인기검색어
- 검색키워드
- 저자 : Vinamrita Singh (검색결과 3 건)
- 무료
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Degradation of fill factor in P3HT:PCBM based organic solar cells
Vinamrita Singh 한국물리학회 2017 Current Applied Physics Vol.17 No.11
In this paper, the degradation of fill factor with time of organic bulk heterojunction solar cells has been investigated up to 312 h. The experimental data of P3HT:PCBM solar cells has been analyzed theoretically to determine the parameters which affect the FF. The existing empirical formula has been applied to degradation data, and it was found to deviate drastically as the cell degrades, indicating that the correct behavior of solar cell is not imitated using the current FF formula. In view of the discrepancy, the expression for fill factor has been modified taking into account the material and device properties, which directly influence the working of a solar cell. All the values can be determined experimentally. The results of the modified expression gives better theoretical fit of FF with time. The results highlight the parameters which should be targeted in order to overcome the short lifetime of organic solar cells.
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Fowler Nordheim Plot Analysis of Degradation in P3HT:PCBM Thin Film MIM Devices
Vinamrita Singh,Ramesh Kumar 한국고분자학회 2019 Macromolecular Research Vol.27 No.10
Metal-Insulator-Metal type devices based on poly(3-hexylthiophene):[6,6]- phenyl-C61-butyric acid methyl ester (P3HT:PCBM) have been examined to understand the effect of degradation on the charge injection and transport phenomena. The Fowler Nordheim (FN) plots with time have been investigated to analyze the behavior of charge tunneling through the potential barrier at the interfaces. A clear transition from thermionic emission to tunneling is observed, and the transition voltage at which this occurs reduces with time. Furthermore, there is appearance of multiple inflexion points with time in the FN plots, and this is explained on the basis of recombination and majority charge carriers within the device. To validate the observations, comparative studies have been carried out on multi-walled carbon nanotube doped samples, which indicate similar behavior for fresh and degraded samples. It is, thus, ascertained that defect states, recombination of charge carriers and the mobility plays a significant role in governing the device behavior.
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Degradation analysis of PCDTBT:PC71BM organic solar cells-an insight
Vishal Sharma,Vinamrita Singh,Manoj Arora,Swati Arora,R.P. Tandon 한국물리학회 2016 Current Applied Physics Vol.16 No.3
The current density-voltage (J-V) characteristics were measured for poly [N-900-heptadeca-nyl-2,7- carbazole-alt-5,5-(40,70-di-2-thienyl-20,10,30-benzo-thiadiazole)]:[6,6]-phenyl-C71-butyric acid methyl ester (PCDTBT:PC71BM) solar cells and studied for degradation analysis up to 150 h of fabrication. It was observed that the dark J-V characteristics in the degraded cell could be explained using both driftdiffusion (D-D) model and space charge limited current (SCLC) model. The D-D model could explain the J-V characteristics at initial voltage region, while SCLC model fitted well in the later part. By comparing the experimental data with theoretical curves, it was found that the transition from D-D model to SCLC model depends on the span of degradation. The results indicated an increase of traps and decrease of charge carrier mobility which may lead to degradation of organic solar cells. This work gave an insight into the degradation mechanism influencing the performance of organic solar cells.
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