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• W2029477513 abstract "The current-voltage characteristics of organic heterojunctions (HJs) are often modeled using the generalized Shockley equation derived for inorganic diodes. However, since this description does not rigorously apply to organic semiconductor donor-acceptor (D-A) HJs, the extracted parameters lack a clear physical meaning. Here, we derive the current density-voltage $(Jtext{ensuremath{-}}V)$ characteristic specifically for D-A HJ solar cells and show that it predicts the general dependence of dark current, open-circuit voltage $({V}_{oc})$, and short-circuit current $({J}_{sc})$ on temperature and light intensity as well as the maximum ${V}_{oc}$ for a given D-A material pair. We propose that trap-limited recombination due to disorder at the D-A interface leads to the introduction of two temperature-dependent ideality factors and show that this describes the dark current of copper phthalocyanine/${text{C}}_{60}$ and boron subphthalocyanine/${text{C}}_{60}$ cells at low temperature, where fits to the generalized Shockley equation break down. We identify the polaron pair recombination rate as a key factor that determines the $Jtext{ensuremath{-}}V$ characteristics in the dark and under illumination and provide direct measurements of this process in our companion paper II [N. C. Giebink, B. E. Lassiter, G. P. Wiederrecht, M. R. Wasielewski, and S. R. Forrest, Phys. Rev. B 82, 155306 (2010)]. These results provide a general physical framework for interpreting the $Jtext{ensuremath{-}}V$ characteristics and understanding the efficiency of both small molecule and polymer organic, planar and bulk HJ solar cells." @default.
• W2029477513 created "2016-06-24" @default.
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• W2029477513 date "2010-10-04" @default.
• W2029477513 modified "2023-10-18" @default.
• W2029477513 title "Ideal diode equation for organic heterojunctions. I. Derivation and application" @default.
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• W2029477513 doi "https://doi.org/10.1103/physrevb.82.155305" @default.
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