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Bulk heterojunction perovskite–PCBM solar cells with high fill factor

Nature Photonics volume 10, pages 196–200 (2016)Cite this article

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Abstract

An inverted bulk heterojunction perovskite–PCBM solar cell with a high fill factor of 0.82 and a power conversion efficiency of up to 16.0% was fabricated by a low-temperature two-step solution process. The cells exhibit no significant photocurrent hysteresis and their high short-circuit current density, fill factor and efficiency are attributed to the advantageous properties of the active layer, such as its high conductivity and the improved mobility and diffusion length of charge carriers. In particular, PCBM plays a critical role in improving the quality of the light-absorbing layer by filling pinholes and vacancies between perovskite grains, resulting in a film with large grains and fewer grain boundaries.

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Figure 1: The fabrication steps and architecture of the inverted perovskite solar cells with and without an additional layer of PCBM.
Figure 2: SEM images of the different film types.
Figure 3: Perovskite grain formation.
Figure 4: I–V curves of the perovskite cell with PCE of 16.0%.
Figure 5: Cross-sectional SEM images of films with different compositions.

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Acknowledgements

Financial support from the Ministry of Science and Technology (MOST), Taiwan (grant number NSC101-2113-M-008-008-MY3) is greatly acknowledged. Device fabrication was carried out in the Advanced Laboratory of Accommodation and Research for Organic Photovoltaics, MOST, Taiwan.

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Authors and Affiliations

  1. Research Center for New Generation Photovoltaics, National Central University, Jhong-Li, 32001, Taiwan

    Chien-Hung Chiang & Chun-Guey Wu

  2. Department of Chemistry, National Central University, Jhong-Li, 32001, Taiwan

    Chun-Guey Wu

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  1. Chien-Hung Chiang
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Contributions

C.H.C. conceived the experiments, carried out the device fabrication, characterizations and performance measurements. C.-G.W. directed the study, analysed data and wrote the manuscript. C.-G.W. wants to thank Z.L. Tseng for helping with the carrier mobility measurements.

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Correspondence to Chun-Guey Wu.

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The authors declare no competing financial interests.

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Chiang, CH., Wu, CG. Bulk heterojunction perovskite–PCBM solar cells with high fill factor. Nature Photon 10, 196–200 (2016). https://doi.org/10.1038/nphoton.2016.3

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