Charge-Transfer States and Upper Limit of the Open-Circuit Voltage in Polymer: Fullerene Organic Solar Cells

被引:67
作者
Vandewal, Koen [1 ,2 ]
Tvingstedt, Kristofer [3 ,4 ]
Manca, Jean V. [1 ,2 ]
Inganas, Olle [3 ,4 ]
机构
[1] Hasselt Univ, Interuniv Microelect Ctr, Inst Mat Res Microelect, Vzw, B-3590 Diepenbeek, Belgium
[2] Hasselt Univ, Inst Mat Res, B-3590 Diepenbeek, Belgium
[3] Linkoping Univ, Dept Phys Chem & Biol, Biomol & Organ Elect Biorgel Res Grp, S-58183 Linkoping, Sweden
[4] Linkoping Univ, Dept Phys Chem & Biol, Ctr Organ Elect, S-58183 Linkoping, Sweden
关键词
Excitons; fullerenes; optical polymers; photovoltaic cells; TRANSFER ABSORPTION; TRANSFER EXCITONS; PHOTOCURRENT SPECTROSCOPY; EFFICIENCY; BLENDS; ENERGY; PERFORMANCE; DEPENDENCE; SILICON; FILMS;
D O I
10.1109/JSTQE.2010.2043061
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
引用
收藏
页码:1676 / 1684
页数:9
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