Analytical Model for Voltage-Dependent Photo and Dark Currents in Bulk Heterojunction Organic Solar Cells

Saleheen, Mesbahus; Arnab, Salman M.; Kabir, Md. Tanvir

doi:10.3390/en9060412

Cited by 22 publications

(15 citation statements)

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“…Same approach was repeated in a more recent report by the aforementioned group including SRH recombination in the active layer. 22 In thin film solar cells, optical effects such as reflection and interference give rise to oscillating feature in the optical generation rate. Such effects have been taken into account by Pettersson et al 9 However, their model does not incorporate dark current and cannot describe the complete J-V characteristics of OSCs.…”

Section: Introductionmentioning

confidence: 99%

Effect of angle of incidence on the performance of bulk heterojunction organic solar cells: A unified optoelectronic analytical framework

Rahman

Alam

2017

AIP Advances

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We analyze the performance of bulk heterojunction organic solar cells under oblique incidence of light. In this regard, we present an optoelectronic analytical model that describes the current-voltage characteristics of bulk heterojunction organic solar cells taking into account the effect of angle of incidence. A closed-form general expression is derived for the optical generation rate under oblique incidence employing transfer matrix formalism. The resulting expression is then incorporated in the classical drift-diffusion transport and continuity equations of charge carriers to derive a unified expression of voltage dependent current density combining optical and electrical parameters. Thus, the model is capable of determining the accurate optical absorption in the active layer for varying angles of incidence as well as predicting the corresponding wavelength dependent external quantum efficiency of the device. The results are verified by comparing with published numerical and experimental results. We show that the maximum efficiency might be achieved at an oblique angle of incidence rather than normal incidence for certain active layer thicknesses. We also report the optimum angles at which the maximum efficiency occurs and show that they are active layer thickness dependent.

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Section: Introductionmentioning

confidence: 99%

Effect of angle of incidence on the performance of bulk heterojunction organic solar cells: A unified optoelectronic analytical framework

Rahman

Alam

2017

AIP Advances

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“…In this contribution, a model combining exciton diffusion and the dissociation rate is proposed. Not only does this model explain the current density versus voltage characteristics under different illuminations but also the J sc results at different active layer thicknesses can quantitatively fit the experimental data of P3HT: PCBM, which can only be qualitatively fitted before. Therefore, a unified method is built by combining exciton diffusion and the dissociation rate to obtain the electrical properties of OSCs.…”

Section: The Parameters Of Calculation (“Device 1” Represents the Parmentioning

confidence: 96%

“…Classical models calculating exciton diffusion and the dissociation rate have been proposed. These two models explain most of the experimental data on the properties of OSCs, such as the current density versus voltage (JV), open‐circuit voltage ( V oc ), short‐circuit current ( J sc ), fill factor (FF), and PCEs . However, meaningful data on the J sc at different layer thicknesses (≈10 1 nm) cannot be quantitatively expounded.…”

Section: The Parameters Of Calculation (“Device 1” Represents the Parmentioning

confidence: 99%

“…These two models explain most of the experimental data on the properties of OSCs, such as the current density versus voltage (JV), open‐circuit voltage ( V oc ), short‐circuit current ( J sc ), fill factor (FF), and PCEs . However, meaningful data on the J sc at different layer thicknesses (≈10 1 nm) cannot be quantitatively expounded. Exploring a new model to explain the relationship between J sc and the thickness of the active layer is urgently needed for analyzing the characteristics of blend and multilayer OSCs.…”

Section: The Parameters Of Calculation (“Device 1” Represents the Parmentioning

confidence: 99%

“…To verify the rationality of this theoretical model, first the calculated J–V results are compared with experimental data at four different P in : 0.5, 0.75, 1.0, and 1.4 sun (1 sun corresponds to the standard solar energy intensity, 100 mW cm −2 ). The numerical results are calculated from the parameters of “device 1” shown in Table (all the parameters in Table are reasonable). The experimental data come from Shuttle et al Figure shows that the numerical results are in good agreement with the experimental data, which demonstrate that this model is well applicable to OSCs.…”

Section: The Parameters Of Calculation (“Device 1” Represents the Parmentioning

confidence: 99%

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Unified Model for Exciton Diffusion and Dissociation in Organic Solar Cells

Xiong

Sun

et al. 2019

Physica Rapid Research Ltrs

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The performance of organic solar cells is limited by the exciton. However, the theoretical model to study the nature of the exciton is separated into exciton diffusion and dissociation. This article proposes a unified model by combining both exciton diffusion and dissociation. This model can be reduced to the classical model of exciton diffusion or dissociation. Moreover, this model quantitatively explains meaningful experimental data of the short‐circuit current characteristic at different active layer thicknesses that cannot be fitted by the two classical models. In sum, this model is useful for researching the mechanism of the exciton in thin organic materials, which make some significant contributions to blend, multilayer, and A–D–A small‐molecule acceptor solar cells.

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