Investigation of non-linear dependence of exciton recombination efficiency on PCBM concentration in P3HT:PCBM blends

Babusenan, Anu; Mondal, Suman; Ramaswamy, Saranya; Dutta, Soumya; Gopalakrishnan, Manoj; Bhattacharyya, Jayeeta

doi:10.1088/2053-1591/ab1daa

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…The PL quenching is dramatically enhanced after Nb doping; in particular, a thin film prepared using doped Nb nanoparticles at 8 mg/mL is the most beneficial for quenching photo-induced photons on the active layer. The quenching of the peak in PL intensity in the P3HT:PCBM:Nb thin films can be related to charge transfer and the improved exciton separation efficiency, which are consistent with earlier findings in the scientific literature [ 50 , 51 ].…”

Section: Resultssupporting

confidence: 91%

Doping with Niobium Nanoparticles as an Approach to Increase the Power Conversion Efficiency of P3HT:PCBM Polymer Solar Cells

et al. 2023

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Metal additive processing in polymer: fullerene bulk heterojunction systems is recognized as a viable way for improving polymer photovoltage performance. In this study, the effect of niobium (Nb) metal nanoparticles at concentrations of 2, 4, 6, and 8 mg/mL on poly(3-hexylthiophene-2,5-diyl) (P3HT)-6,6]-phenyl C61-butyric acid methyl ester (PCBM) blends was analyzed. The effect of Nb volume concentration on polymer crystallinity, optical properties, and surface structure of P3HT and PCBM, as well as the enhancement of the performance of P3HT:PC61BM solar cells, are investigated. Absorption of the P3HT:PC61BM mix is seen to have a high intensity and a red shift at 500 nm. The reduction in PL intensity with increasing Nb doping concentrations indicates an increase in PL quenching, suggesting that the domain size of P3HT or conjugation length increases. With a high Nb concentration, crystallinity, material composition, surface roughness, and phase separation are enhanced. Nb enhances PCBM’s solubility in P3HT and decreases the size of amorphous P3HT domains. Based on the J–V characteristics and the optoelectronic study of the thin films, the improvement results from a decreased recombination current, changes in morphology and crystallinity, and an increase in the effective exciton lifespan. At high doping concentrations of Nb nanoparticles, the development of the short-circuit current (JSC) is associated with alterations in the crystalline structure of P3HT. The highest-performing glass/ITO/PEDOT:PSS/P3HT:PCBM:Nb/MoO3/Au structures have short-circuit current densities (JSC) of 16.86 mA/cm2, open-circuit voltages (VOC) of 466 mV, fill factors (FF) of 65.73%, and power conversion efficiency (µ) of 5.16%.

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Section: Resultssupporting

confidence: 91%

Doping with Niobium Nanoparticles as an Approach to Increase the Power Conversion Efficiency of P3HT:PCBM Polymer Solar Cells

et al. 2023

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“…The generated excitons can either dissociate into free electron-hole pairs, radiatively recombine to generate photons, or de-excite nonradiatively via phonons. For organic solar cells, it is desirable to minimize the radiative and non-radiative recombination processes to increase the probability of the generation of free electron-hole pairs [2], which contribute to the photocurrent. Donor-acceptor heterojunctions assist in the exciton dissociation [3,4] and are, therefore, widely used for fabricating organic solar cells.…”

Section: Introductionmentioning

confidence: 99%

“…Poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluor o-4,7-di(thiophen-2-yl)benzo[c]- [1,2,5]thiadiazole)] (PPDT2 FBT), which is used as the active material in this study, is an ideal candidate for the organic solar cell due to its high absorption coefficients over the entire visible spectrum [15]. It has high hole mobility and excellent thermal stability [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

The nature of excitons in PPDT2FBT:PCBM solar cells: Role played by PCBM

Sahoo¹,

Barah²,

S³

et al. 2022

J. Phys. D: Appl. Phys.

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In organic semiconductor based bulk heterojunction solar cells, the presence of acceptor increases the formation of charge transfer (CT) excitons, thereby leading to higher exciton dissociation probabilities. In this work we used steady state electroabsorption (EA) measurements to probe the change in the nature of excitons as the blend composition of the solar cell active layer material is varied. We investigated blends of poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c]-[1,2,5]thiadiazole)] (PPDT2FBT) and (6,6)-Phenyl C71 butyric acid methyl ester (PCBM). Analysis of the EA spectra showed that in presence of fullerene based acceptor, like PCBM, CT characteristics of the excitons were modified, though, no new CT signature was observed in the blend. Enhancement in the CT characteristic in the blend was reflected in the photoluminescence (PL) measurements of the blends, where, PL quenching of $\sim$ 63\% was observed for 1\% PCBM. The quenching reaches saturation at about 20\% PCBM. However, efficiency of the device increased with PCBM percentage beyond 20\%. The maximum efficiency was obtained for the blend having 50\% PCBM, among the blend compositions studied in this work, indicating the optimum concentration of PCBM for best power conversion efficiency to be around that value. Comparing experimental results with simulations, the variation of the device efficiency with PCBM percentage was shown to be arising from multiple factors like increase in polarizability and dipole moment of excitons, and the efficiency of the carrier collection from the bulk of the active layer.

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Investigation of non-linear dependence of exciton recombination efficiency on PCBM concentration in P3HT:PCBM blends

Cited by 2 publications

References 16 publications

Doping with Niobium Nanoparticles as an Approach to Increase the Power Conversion Efficiency of P3HT:PCBM Polymer Solar Cells

Doping with Niobium Nanoparticles as an Approach to Increase the Power Conversion Efficiency of P3HT:PCBM Polymer Solar Cells

The nature of excitons in PPDT2FBT:PCBM solar cells: Role played by PCBM

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