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An organic solar cell theoretical model with two concepts of excitonic and bipolar transport
Author(s) -
Shahini Ali
Publication year - 2012
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.1624
Subject(s) - charge carrier , absorption (acoustics) , radiative transfer , exciton , limit (mathematics) , detailed balance , solar cell , charge (physics) , photon , carrier lifetime , physics , computational physics , materials science , optoelectronics , condensed matter physics , statistical physics , quantum mechanics , optics , mathematical analysis , mathematics , silicon
ABSTRACT This paper models the interplay between the detailed radiation balance and the charge carrier transport of organic solar cells. By incorporating the so‐called photon recycling (self‐absorption) into the continuity equation of minority carriers, this model can describe the radiative efficiency of existing cells as well as the radiative recombination limited ones. For high mobilities, the model reproduces the Shockley Queisser efficiency limit. Therefore, the model connects the classical diode theory and the Shockley Queisser detailed balance efficiency limit. The effect of adding nanoparticles into such cells is to increase the absorption coefficient by providing higher absorption probability at the region with high concentration of nanoparticles. To model this effect, the exponential integral term is used. The paper shows that even in case of the radiative recombination limit, charge carrier transport is extremely important. Finally, it discusses the effect of excitons and charge carrier mobilities on transport. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd.