Homo-tandem structures to achieve the ideal external quantum efficiency in small molecular organic solar cells | Zendy

Sanghoon Lee | Zendy; JungYong Lee | Zendy

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Homo-tandem structures to achieve the ideal external quantum efficiency in small molecular organic solar cells

Author(s) -

Sanghoon Lee,

JungYong Lee

Publication year - 2018

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.00a697

Subject(s) - tandem , quantum efficiency , energy conversion efficiency , materials science , optoelectronics , absorption (acoustics) , organic solar cell , optics , physics , polymer , composite material

In this study, we report a homo-tandem structure of small molecular organic solar cells (SMOSCs) using identical single-junction devices as sub-cells. The trade-off between the absorption and internal quantum efficiency (IQE) of single-junction devices tends to limit the external quantum efficiency (EQE). However, multiple-stacked thin cells with maximized IQE in homo-tandem structures amplify the absorption to achieve the ideal EQE. As a result, a high power conversion efficiency of 7.81% is achieved in tetraphenyldibenzoperiflanthene (DBP):C 70 -based homo-tandem SMOSCs, which is 21.8% higher than that in a single-junction device.

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