Optimization of inverted tandem organic solar cells

Inverted tandem organic solar cells, consisting of two bulk heterojunction sub-cells with identical poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C 61 (PCBM) active layer and a MoO 3/Ag/Al/Ca intermediate layer, have been presented and optimized. Indium tin oxide (ITO)...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2011-03, Vol.95 (3), p.921-926
Main Authors: Zhao, D.W., Ke, L., Li, Y., Tan, S.T., Kyaw, A.K.K., Demir, H.V., Sun, X.W., Carroll, D.L., Lo, G.Q., Kwong, D.L.
Format: Article
Language:English
Subjects:
Anodes
Applied sciences
Buffer layer
Cathodes
Collection
Devices
Energy
Exact sciences and technology
Indium tin oxide
Intermediate layer
Inverted structure
Natural energy
Optimization
Photovoltaic cells
Photovoltaic conversion
Silver
Solar cells
Solar cells. Photoelectrochemical cells
Solar energy
Solar radiation
Tandem organic solar cells
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Summary:Inverted tandem organic solar cells, consisting of two bulk heterojunction sub-cells with identical poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C 61 (PCBM) active layer and a MoO 3/Ag/Al/Ca intermediate layer, have been presented and optimized. Indium tin oxide (ITO) modified by Ca acts as a cathode for electron collection and Ag is used as the anode for hole collection for the tandem device. A proper thickness of Ca (3 nm) forms a continuous layer, working as a cathode for the top sub-cell. MoO 3 as the anode buffer layer prevents exciton quenching and charge loss at the anode side, which could result in increase in interfacial resistance. The variance of sub-cell thickness adjusts the optical field distribution in the entire device, facilitating light absorption and good current matching in both sub-cells. The optimal inverted tandem device achieves a maximum power conversion efficiency of 2.89% with a short-circuit current density of 4.19 mA/cm 2, an open-circuit voltage of 1.17 V, and a fill factor of 59.0% under simulated 100 mW/cm 2 (AM 1.5G) solar irradiation.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2010.11.023