Metamorphosis of the ZnO buffer layer thicknesses on the performance of inverted organic solar cells

Sahdan, Mohd Zainizan; Malek, M. F.; Alias, M. S.; Kamaruddin, Sharul Ashikin; Ani, Norhidayah Che; Sarip, Nurulnadia; Nayan, Nafarizal; Rusop, M.

doi:10.1007/s10854-016-5425-1

Cited by 1 publication

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“…In practice, one is limited by the finite conductivity of these spacers. Nevertheless, large spacer values have been used in OLED [65] and also considered before in organic solar cells [31,34,36,67,68].…”

Section: Discussionmentioning

confidence: 99%

Design of Organic Solar Cells as a Function of Radiative Quantum Efficiency

Godefroid

Kozyreff

2017

Phys. Rev. Applied

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We study the radiative decay, or fluorescence, of excitons in organic solar cells as a function of its geometrical parameters. Contrary to their nonradiative counterpart, fluorescence losses strongly depend on the environment. By properly tuning the thicknesses of the buffer layers between the active regions of the cell and the electrodes, the exciton lifetime and, hence, the exciton diffusion length can be increased. The importance of this phenomenon depends on the radiative quantum efficiency, which is the fraction of the exciton decay that is intrinsically due to fluorescence. Besides this effect, interferences within the cell control the efficiency of sunlight injection into the active layers. The optimal cell design must rely on a consideration of these two aspects. By properly managing fluorescence losses, one can significantly improve the cell performance. To demonstrate this fact, we use realistic material parameters inspired from literature data and obtain an increase of power-conversion efficiency from 11.3% to 12.7%. Conversely, not to take into account the strong dependence of fluorescence on the environment may lead to a suboptimal cell design and a degradation of cell performance. The presence of radiative losses, however small, significantly changes the optimal set of thicknesses. We illustrate the latter situation with experimental material data.

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