Volume 7 Issue 5
Oct.  2022
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Article Navigation >  Green Energy&Environment  > 2022  >  7(5): 1102-1110
Chang-Mok Oh, Soyeong Jang, Jihoon Lee, Sung Heum Park, In-Wook Hwang. Versatile control of concentration gradients in non-fullerene acceptor-based bulk heterojunction films using solvent rinse treatments. Green Energy&Environment, 2022, 7(5): 1102-1110. doi: 10.1016/j.gee.2021.01.009
Citation: Chang-Mok Oh, Soyeong Jang, Jihoon Lee, Sung Heum Park, In-Wook Hwang. Versatile control of concentration gradients in non-fullerene acceptor-based bulk heterojunction films using solvent rinse treatments. Green Energy&Environment, 2022, 7(5): 1102-1110. doi: 10.1016/j.gee.2021.01.009
shu

Versatile control of concentration gradients in non-fullerene acceptor-based bulk heterojunction films using solvent rinse treatments

doi: 10.1016/j.gee.2021.01.009

  • a Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea;

  • b Department of Physics, Pukyong National University, Busan, 48513, Republic of Korea

Funds:

This research study was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2017R1D1A1B03030669), and the GIST Research Institute (GRI) APRI grant funded by GIST in 2020.

  • Received date 14 October 2020, Accepted date 08 January 2021, RevRecd date 09 December 2020, Publish date 13 January 2021,
    Abstract
  • Solvent rinse treatments using polar methanol (MeOH) and nonpolar n-hexane have been developed for controlling material concentration gradients along the longitudinal direction of non-fullerene acceptor-based bulk heterojunction (BHJ) films comprised of electron donor polymer, PBDB-T and acceptor, ITIC-m. Before the used solvents (chlorobenzene with 1 vol% DIO) were completely evaporated, ITIC-m rich domains were formed at the top surface of the BHJ films after they were rinsed with MeOH, as evidenced by water contact angle, atomic force microscopy, time-of-flight secondary ion mass spectroscopy, which led to enhanced electron transport in the conventional structure of organic solar cells (OSCs). In contrast, after rinsing with n-hexane, ITIC-m rich domains were formed at the bottom surface of the films, which improved electron transport in the inverted structure OSCs. The enhanced carrier transports increased the PCEs (11.80% and 11.15%) in both conventional and inverted OSCs by 10.29% and 10.35% compared with control devices. The versatile control of material concentration gradients is determined to be feasible owing to the chemical interaction of the used substrates (glass, PEDOT:PSS, and ZnO) and rinsing solvents.

     

    • These authors contributed equally to this work.
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