Ultrafast multi-phasic electron injection in efficient non-aggregated hyperbranched zinc phthalocyanine sensitized solar cells

Yong Li; Peifen Lu; Xingzhong Yan; Lu Jin; Zhonghua Peng

doi:10.1117/12.933940

13 September 2012 Ultrafast multi-phasic electron injection in efficient non-aggregated hyperbranched zinc phthalocyanine sensitized solar cells

Yong Li, Peifen Lu, Xingzhong Yan, Lu Jin, Zhonghua Peng

Author Affiliations +

Proceedings Volume 8477, Organic Photovoltaics XIII; 84771U (2012) https://doi.org/10.1117/12.933940
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

Abstract

A novel hyperbranched zinc phthalocyanine dye, i.e. HBZnPc-COOH, was synthesized, characterized, and applied into dye-sensitized solar cells (DSSCs) as TiO₂ sensitizer. UV-visible absorption, steady-state fluorescence, femtosecond time-resolved fluorescence, cyclic voltammetry, current–voltage characteristics, and photoelectrical properties of the active material/device were investigated. The utilization of hyperbranched structure was proved to be able to solve the aggregation issue of phthalocyanine dyes on TiO₂ surface which has been widely considered as one of the key limiting issues that severely lower the efficiencies of phthalocyanine dye sensitized solar cells. With appropriate highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels, HBZnPc-COOH exhibited efficient and ultrafast multi-phasic electron injection from both the Soret band and Q band to the conduction band of TiO₂, leading to a solar cell power conversion efficiency of 1.15% and a high incident photon to current conversion efficiency of 66.7% at 670 nm.

Citation Download Citation

Yong Li, Peifen Lu, Xingzhong Yan, Lu Jin, and Zhonghua Peng "Ultrafast multi-phasic electron injection in efficient non-aggregated hyperbranched zinc phthalocyanine sensitized solar cells", Proc. SPIE 8477, Organic Photovoltaics XIII, 84771U (13 September 2012); https://doi.org/10.1117/12.933940

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