Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.362
Publication date: 7th February 2022
Fine-tuning of blend morphology is a key factor that limits the performance of the bulk-heterojunction organic photovoltaics (BHJ-OPVs). Herein, the morphological control of the binary (PM6:Y7) blends is conducted through 1-chloronaphthalene (CN) solvent additive and thermal annealing (TA) treatment with respect to their influence on the photovoltaic performance. Moreover, a distinct study is accomplished on the optical and electronic properties of the treated and nontreated binary and ternary devices by external quantum efficiency measurements and impedance spectroscopy. The results indicate that with the 2% CN addition, the current density of the binary devices is improved by ≈27 as well as the PCEs for binary devices (with/without CN) were improved by the thermal annealing step. Accordingly, the highest efficiencies of the binary OPVs are obtained due to the dual effect of 2% CN solvent additive along with the TA treatments.
Enas Moustafa acknowledges the Agency for Management of University and Research Grants (AGAUR) for receiving the fund with grant number 2019 FI_B01102. This work was further supported by the Spanish Ministerio de Ciencia, Innovación y Universidades (MICINN/FEDER) RTI2018-094040-B-I00, by AGAUR ref. 2017-SGR-1527. The authors also acknowledge Dr. Maria Mendez for the photoluminescence measurement held in the Institute of Chemical Research of Catalonia, Barcelona Institute of Science and Technology (ICIQ-BIST).
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