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|Title: ||Charge-Transfer States and Upper Limit of the Open-Circuit Voltage in Polymer: Fullerene Organic Solar Cells|
|Authors: ||VANDEWAL, Koen|
|Issue Date: ||2010|
|Publisher: ||IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC|
|Citation: ||IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, 16(6). p. 1676-1684|
|Abstract: ||The power conversion efficiency of polymer: fullerene bulk heterojunction solar cells depends on the generated photocurrent and photovoltage. Here we show, using the thermodynamic theory of detailed balance, that the photovoltage in particular is limited by the presence of polymer: fullerene material interaction, resulting in the formation of a weak donor-acceptor charge transfer complex (CTC). Excited CTCs, or charge transfer (CT) states, are visible in highly sensitive measurements of the absorption and photovoltaic action spectrum, or in photoluminescence and electroluminescence measurements. It is shown that photovoltaic and electroluminescent actions of the polymer: fullerene CTC are related by a reciprocity relation. This relation reproduces the measured open-circuit voltage (V-oc) of the photovoltaic device under solar conditions. Also, the temperature and illumination intensity dependence of V-oc is reproduced by the theory. Assuming perfect conditions for charge generation and recombination, a maximum obtainable V-oc value in function of polymer: fullerene CTC properties is derived.|
|Notes: ||[Vandewal, Koen; Manca, Jean V.] Hasselt Univ, Interuniv Microelect Ctr, Inst Mat Res Microelect, Vzw, B-3590 Diepenbeek, Belgium. [Vandewal, Koen; Manca, Jean V.] Hasselt Univ, Inst Mat Res, B-3590 Diepenbeek, Belgium. [Tvingstedt, Kristofer; Inganas, Olle] Linkoping Univ, Dept Phys Chem & Biol, Biomol & Organ Elect Biorgel Res Grp, S-58183 Linkoping, Sweden. [Tvingstedt, Kristofer; Inganas, Olle] Linkoping Univ, Dept Phys Chem & Biol, Ctr Organ Elect, S-58183 Linkoping, Sweden.
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|ISI #: ||000288488400022|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2012|
|Appears in Collections: ||Research publications|
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