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Correlating annealing temperature of ZnO nanoparticle electron transport layer with performance of inverted polymer solar cells

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Abstract

We fabricated inverted polymer solar cells (PSCs) with the structure of ITO/ZnO NPs/Active layer/MoO3/Ag, in which ZnO NPs act as electron transport layer (ETL), poly{4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b0]-dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophene-4,6-diy (PTB7) as donor and [6,6]-phenyl-C71-butyric-acidmethyl-ester (PC71BM) as accepter. It is found that the temperature employed during the annealing process of ZnO NPs has significant impact on the efficiency of the resulted PSCs. The optimized PSC with ZnO NPs annealed at 150 °C based on PTB7:PC71BM (1:1.5 w/w) exhibited a power-conversion efficiency of 7.37% with open-circuit voltage (Voc) of 0.722 V, short-circuit current density (Jsc) of 15.38 mA cm−2, and fill factor (FF) of 66.4%. The effects of the annealing temperature on photovoltaic performances were further illustrated with transmission spectrum, atomic force microscopy, X-ray diffraction and PL spectra, meanwhile electrical performance were illustrated with conductivity. Our result indicated that the improved efficiency is due to the optimized ETL/active layer interface, the enhanced transparency and electron transport of the ETLs. As its facile preparation process, this kind of ETL is compatible with roll-to-roll manufacturing of larger area flexible PSCs.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (no. 61377031), the National Natural Science Foundation of China (Grant no. 61404073) and the Natural Science Foundation of Tianjin (Grant no. 17JCYBJC21200).

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Authors and Affiliations

  1. The Tianjin Key Laboratory for Optical-Electronic Thin Film Devices and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China

    Rui Xu, Xiaoxiang Sun, Chang Li, Like Huang, Zhenglong Li, Hongkun Cai, Juan Li, Jian Ni & Jianjun Zhang

  2. College of Science, Tianjin Polytechnic University, Tianjin, 300387, China

    Yaofang Zhang

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  1. Rui Xu
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  2. Xiaoxiang Sun
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Correspondence to Jian Ni.

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Xu, R., Sun, X., Li, C. et al. Correlating annealing temperature of ZnO nanoparticle electron transport layer with performance of inverted polymer solar cells. Polym. Bull. 75, 4397–4408 (2018). https://doi.org/10.1007/s00289-018-2279-0

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