An optoelectronic analytical model for bulk heterojunction organic solar cells incorporating position and wavelength dependent carrier generation

Chowdhury, Mohammed Raihan; Alam, Md. Kawsar

doi:10.1016/j.solmat.2014.08.038

Cited by 17 publications

(28 citation statements)

References 35 publications

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“…P(E) depends on the field dependent dissociation rate constant, k diss and decay rate, k f . 5, 19 The dynamics of exciton dissociation and determination of P(E) have been described in detail elsewhere. 5 While travelling towards the electrodes, free charge carriers may undergo first order (monomolecular) and/or second order (bimolecular) recombination.…”

Section: -6mentioning

confidence: 99%

“…The assumption of a constant generation rate might not be applicable for all cases and may result in substantial error in calculated device efficiency. 19 While, Arnab and Kabir 17 did consider the space dependency of exciton generation rate in their model, they treated photocurrent due to front-end irradiation and rear-end reflection separately. Also, by using exponential Beer-Lambert law to model the generation rate, they did not consider the optical interference effect, which becomes significant for thin film cells.…”

Section: Introductionmentioning

confidence: 99%

“…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. A recent model by Chowdhury and Alam 19 incorporates these optical effects on exciton generation rate and has been able to successfully predict the dark and photo currents of OSCs under normal incidence of light. A slight modification of the model including monomolecular recombination was proposed recently.…”

Section: Introductionmentioning

confidence: 99%

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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: -6mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Therefore, the electric field F is considered uniform across the active layer. The drift mobility () and carrier lifetime () of holes and electrons are also considered uniform to allow the problem to be analytically tractable [9].…”

Section: Dark Currentmentioning

confidence: 99%

“…The previous model [8] ignored the contact effects. The Fermi positions at the two metal contacts are fixed by the metal work functions and thus the charge carrier concentrations at the contacts remain the same irrespective of the operating output voltage [9]. In this paper, the previous analytical model for the photocurrent has been modified by solving the continuity equations for both electrons and holes with proper boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

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

2016

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Abstract:A physics-based explicit mathematical model for the external voltage-dependent forward dark current in bulk heterojunction (BHJ) organic solar cells is developed by considering Shockley-Read-Hall (SRH) recombination and solving the continuity equations for both electrons and holes. An analytical model for the external voltage-dependent photocurrent in BHJ organic solar cells is also proposed by incorporating exponential photon absorption, dissociation efficiency of bound electron-hole pairs (EHPs), carrier trapping, and carrier drift and diffusion in the photon absorption layer. Modified Braun's model is used to compute the electric field-dependent dissociation efficiency of the bound EHPs. The overall net current is calculated considering the actual solar spectrum. The mathematical models are verified by comparing the model calculations with various published experimental results. We analyze the effects of the contact properties, blend compositions, charge carrier transport properties (carrier mobility and lifetime), and cell design on the current-voltage characteristics. The power conversion efficiency of BHJ organic solar cells mostly depends on electron transport properties of the acceptor layer. The results of this paper indicate that improvement of charge carrier transport (both mobility and lifetime) and dissociation of bound EHPs in organic blend are critically important to increase the power conversion efficiency of the BHJ solar cells.

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Organic Solar Cells

Choy¹

2013

Green Energy and Technology

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An optoelectronic analytical model for bulk heterojunction organic solar cells incorporating position and wavelength dependent carrier generation

Cited by 17 publications

References 35 publications

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

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

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

Organic Solar Cells

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