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Open AccessArticle

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

Department of Electrical and Computer Engineering, Concordia University, 1455 Blvd. de Maisonneuve West, Montreal, QC H3G 1M8, Canada
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Author to whom correspondence should be addressed.
Academic Editor: Narottam Das
Energies 2016, 9(6), 412; https://doi.org/10.3390/en9060412
Received: 16 April 2016 / Revised: 13 May 2016 / Accepted: 14 May 2016 / Published: 26 May 2016
(This article belongs to the Special Issue Nano-Structured Solar Cells)
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. View Full-Text
Keywords: organic solar cells; analytical model; current-voltage characteristics; dark current; trapping/recombination; charge collection organic solar cells; analytical model; current-voltage characteristics; dark current; trapping/recombination; charge collection
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MDPI and ACS Style

Saleheen, M.; Arnab, S.M.; Kabir, M.Z. Analytical Model for Voltage-Dependent Photo and Dark Currents in Bulk Heterojunction Organic Solar Cells. Energies 2016, 9, 412.

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