Wide-gap non-fullerene acceptor enabling high-performance organic photovoltaic cells for indoor applications

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Abstract

Organic photovoltaic cells are potential candidates to drive low power consumption off-grid electronics for indoor applications. However, their power conversion efficiency is still limited by relatively large losses in the open-circuit voltage and a non-optimal absorption spectrum for indoor illumination. Here, we carefully designed a non-fullerene acceptor named IO-4Cl and blend it with a polymer donor named PBDB-TF to obtain a photoactive layer whose absorption spectrum matches that of indoor light sources. The photovoltaic characterizations reveal a low energy loss below 0.60 eV. As a result, the organic photovoltaic cell (1 cm2) shows a power conversion efficiency of 26.1% with an open-circuit voltage of 1.10 V under a light-emitting diode illumination of 1,000 lux (2,700 K). We also fabricated a large-area cell (4 cm2) through the blade-coating method. Our cell shows an excellent stability, maintaining its initial photovoltaic performance under continuous illumination of the indoor light source for 1,000 hours.

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Fig. 1: Molecular structures and ESP distributions of the materials.
Fig. 2: Absorption spectra and energy levels of the materials and their photovoltaic performances.
Fig. 3: Energy losses of PBDB-TF:IO-4Cl-based cells.
Fig. 4: Photovoltaic performance for indoor applications.
Fig. 5: Photovoltaic performance of large-area devices.

Data availability

The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.

References

  1. 1.

    Atzori, L., Iera, A. & Morabito, G. The internet of things: a survey. Comput. Netw. 54, 2787–2805 (2010).

  2. 2.

    Gubbi, J., Buyya, R., Marusic, S. & Palaniswami, M. Internet of things (IoT): a vision, architectural elements, and future directions. Future Gener. Comp. Syst. 29, 1645–1660 (2013).

  3. 3.

    Al-Fuqaha, A., Guizani, M., Mohammadi, M., Aledhari, M. & Ayyash, M. Internet of things: a survey on enabling technologies, protocols, and applications. IEEE Commun. Surv. Tut. 17, 2347–2376 (2015).

  4. 4.

    Khan, J. A., Qureshi, H. K. & Iqbal, A. Energy management in wireless sensor networks: a survey. Comput. Electr. Eng. 41, 159–176 (2015).

  5. 5.

    Yin, H. et al. Designing a ternary photovoltaic cell for indoor light harvesting with a power conversion efficiency exceeding 20%. J. Mater. Chem. A 6, 8579–8585 (2018).

  6. 6.

    Lee, H. K. H., Li, Z., Durrant, J. R. & Tsoi, W. C. Is organic photovoltaics promising for indoor applications? Appl. Phys. Lett. 108, 253301 (2016).

  7. 7.

    Minnaert, B. & Veelaert, P. A proposal for typical artificial light sources for the characterization of indoor photovoltaic applications. Energies 7, 1500–1516 (2014).

  8. 8.

    Freitag, M. et al. Dye-sensitized solar cells for efficient power generation under ambient lighting. Nat. Photon. 11, 372–378 (2017).

  9. 9.

    Teran, A. S. et al. Energy harvesting for GaAs photovoltaics under low-flux indoor lighting conditions. IEEE Trans. Electron. Dev. 63, 2820–2825 (2016).

  10. 10.

    Freunek, M., Freunek, M. & Reindl, L. M. Maximum efficiencies of indoor photovoltaic devices. IEEE J. Photovolt. 3, 59–64 (2013).

  11. 11.

    Minnaert, B. & Veelaert, P. Efficiency simulations of thin film chalcogenide photovoltaic cells for different indoor lighting conditions. Thin Solid Films 519, 7537–7540 (2011).

  12. 12.

    Mori, S. et al. Investigation of the organic solar cell characteristics for indoor LED light applications. Jpn J. Appl. Phys. 54, 071602 (2015).

  13. 13.

    De Rossi, F., Pontecorvo, T. & Brown, T. M. Characterization of photovoltaic devices for indoor light harvesting and customization of flexible dye solar cells to deliver superior efficiency under artificial lighting. Appl. Energy 156, 413–422 (2015).

  14. 14.

    Cutting, C. L., Bag, M. & Venkataraman, D. Indoor light recycling: a new home for organic photovoltaics. J. Mater. Chem. C 4, 10367–10370 (2016).

  15. 15.

    Cao, Y., Liu, Y., Zakeeruddin, S. M., Hagfeldt, A. & Grätzel, M. Direct contact of selective charge extraction layers enables high-efficiency molecular photovoltaics. Joule 2, 1108–1117 (2018).

  16. 16.

    Li, M. et al. Interface modification by ionic liquid: a promising candidate for indoor light harvesting and stability improvement of planar perovskite solar cells. Adv. Energy Mater. 8, 1801509 (2018).

  17. 17.

    Lee, H. K. H. et al. Organic photovoltaic cells—promising indoor light harvesters for self-sustainable electronics. J. Mater. Chem. A 6, 5618–5626 (2018).

  18. 18.

    Liu, X., Huettner, S., Rong, Z., Sommer, M. & Friend, R. H. Solvent additive control of morphology and crystallization in semiconducting polymer blends. Adv. Mater. 24, 669–674 (2012).

  19. 19.

    Lin, Y. Z. & Zhan, X. W. Non-fullerene acceptors for organic photovoltaics: an emerging horizon. Mater. Horiz. 1, 470–488 (2014).

  20. 20.

    Gupta, V. et al. Barium: an efficient cathode layer for bulk-heterojunction solar cells. Sci. Rep. 3, 1965 (2013).

  21. 21.

    Zhang, H. et al. Fullerene-free polymer solar cell based on a polythiophene derivative with an unprecedented energy loss of less than 0.5 eV. J. Mater. Chem. A 4, 18043–18049 (2016).

  22. 22.

    Xu, X. et al. Realizing over 13% efficiency in green-solvent-processed nonfullerene organic solar cells enabled by 1,3,4-thiadiazole-based wide-bandgap copolymers. Adv. Mater. 30, 1703973 (2018).

  23. 23.

    Zhang, J., Tan, H. S., Guo, X., Facchetti, A. & Yan, H. Material insights and challenges for non-fullerene organic solar cells based on small molecular acceptors. Nat. Energy 3, 720–731 (2018).

  24. 24.

    Aoki, Y. Photovoltaic performance of organic photovoltaics for indoor energy harvester. Org. Electron. 48, 194–197 (2017).

  25. 25.

    Lechêne, B. P. et al. Organic solar cells and fully printed super-capacitors optimized for indoor light energy harvesting. Nano Energy 26, 631–640 (2016).

  26. 26.

    Zhang, M., Guo, X., Ma, W., Ade, H. & Hou, J. A large-bandgap conjugated polymer for versatile photovoltaic applications with high performance. Adv. Mater. 27, 4655–4660 (2015).

  27. 27.

    Zhang, H. et al. Over 14% efficiency in organic solar cells enabled by chlorinated nonfullerene small-molecule acceptors. Adv. Mater. 30, 1800613 (2018).

  28. 28.

    Zhang, S., Qin, Y., Zhu, J. & Hou, J. Over 14% efficiency in polymer solar cells enabled by a chlorinated polymer donor. Adv. Mater. 30, 1800868 (2018).

  29. 29.

    Zhao, F. et al. Single-junction binary-blend nonfullerene polymer solar cells with 12.1% efficiency. Adv. Mater. 29, 1700144 (2017).

  30. 30.

    Lin, Y. et al. Mapping polymer donors toward high-efficiency fullerene free organic solar cells. Adv. Mater. 29, 1604155 (2017).

  31. 31.

    Lin, Y. et al. An electron acceptor challenging fullerenes for efficient polymer solar cells. Adv. Mater. 27, 1170–1174 (2015).

  32. 32.

    Nikolis, V. C. et al. Reducing voltage losses in cascade organic solar cells while maintaining high external quantum efficiencies. Adv. Energy Mater. 7, 1700855 (2017).

  33. 33.

    Vandewal, K., Benduhn, J. & Nikolis, V. C. How to determine optical gaps and voltage losses in organic photovoltaic materials. Sustain. Energy Fuels 2, 538–544 (2018).

  34. 34.

    Wang, Y. et al. Optical gaps of organic solar cells as a reference for comparing voltage losses. Adv. Energy Mater. 8, 1801509 (2018).

  35. 35.

    Yao, J. et al. Quantifying losses in open-circuit voltage in solution-processable solar cells. Phys. Rev. Appl. 4, 014020 (2015).

  36. 36.

    Liu, J. et al. Fast charge separation in a non-fullerene organic solar cell with a small driving force. Nat. Energy 1, 16089 (2016).

  37. 37.

    Qian, D. et al. Design rules for minimizing voltage losses in high-efficiency organic solar cells. Nat. Mater. 17, 703–709 (2018).

  38. 38.

    Ran, N. A. et al. Harvesting the full potential of photons with organic solar cells. Adv. Mater. 28, 1482–1488 (2016).

  39. 39.

    Li, W. et al. Molecular order control of non-fullerene acceptors for high-efficiency polymer solar cells. Joule 3, 1–15 (2018).

  40. 40.

    Zhang, J. et al. Enhancing performance of large-area organic solar cells with thick film via ternary strategy. Small 13, 1700388 (2017).

  41. 41.

    Zhang, K. et al. Efficient large area organic solar cells processed by blade-coating with single-component green solvent. Solar RRL 2, 1700169 (2018).

  42. 42.

    Vandewal, K., Tvingstedt, K., Gadisa, A., Inganas, O. & Manca, J. V. On the origin of the open-circuit voltage of polymer–fullerene solar cells. Nat. Mater. 8, 904–909 (2009).

  43. 43.

    Cowan, S. R., Roy, A. & Heeger, A. J. Recombination in polymer–fullerene bulk heterojunction solar cells. Phys. Rev. B 82, 245207 (2010).

  44. 44.

    Elumalai, N. K. & Uddin, A. Open circuit voltage of organic solar cells: an in-depth review. Energy Environ. Sci. 9, 391–410 (2016).

  45. 45.

    Guo, B. et al. High efficiency nonfullerene polymer solar cells with thick active layer and large area. Adv. Mater. 29, 1702291 (2017).

  46. 46.

    Green, M. A. Solar-cell fill factors—general graph and empirical expressions. Solid State Electron. 24, 788–789 (1981).

  47. 47.

    Zhou, Y. H. et al. All-plastic solar cells with a high photovoltaic dynamic range. J. Mater. Chem. A 2, 3492–3497 (2014).

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Acknowledgements

The authors acknowledge financial support from National Natural Science Foundation of China (Grant nos. 51673201 and 91633301), Beijing National 434 Laboratory for Molecular Sciences (Grant no. BNLMS-CXXM-201903), Chinese Academy of Sciences (Grant no. XDB12030200), the Swedish Research Council VR (2018-06048), the Swedish Energy Agency Energimyndigheten (2016-010174) and the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant no. SFO-Mat-LiU #2009-00971). F.G. is a Wallenberg Academy Fellow and O.I. is a Wallenberg Academy Scholar.

Author information

Y.C. and J.H. designed the experiments. Y.C. synthesized the acceptor material IO-4Cl. Y.C. fabricated the solar cells and carried out the published device performance measurements. F.G. led the work at Linköping. J.B. initiated the indoor characterization, performed the first indoor device measurements and contributed to the design of the indoor measurements. Y.W. measured the FTPS-EQE and EQEEL. Y.X. performed the DFT calculations. B.G. carried out photo-CELIV (charge extraction by linearly increasing voltage) measurements. C.Y. provided atomic force microscopy images. O.I. contributed to the data interpretation. S.Z. analysed the dependence of the PCEs on Rs under the indoor and AM 1.5G conditions. Y.C., H.Y., F.G. and J.H. wrote the paper. All the authors discussed the results and commented on the manuscript.

Correspondence to Feng Gao or Jianhui Hou.

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Competing interests

J.B. and O.I. are co-founders of the company Epishine AB focused on commercializing OPV for indoor applications.

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Supplementary Figs. 1–27, Supplementary Notes 1–5, Supplementary Tables 1–4 and Supplementary refs. 1–48.

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Cui, Y., Wang, Y., Bergqvist, J. et al. Wide-gap non-fullerene acceptor enabling high-performance organic photovoltaic cells for indoor applications. Nat Energy 4, 768–775 (2019) doi:10.1038/s41560-019-0448-5

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