Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Organic photovoltaics OPVs have attracted a great deal of attention as promising candidates for renewable energy because of their flexibility, lightweight, and high semi-transparency. However, the efficiency of OPV devices remains lower than that of their inorganic counterparts. Therefore, there is a need for continued research aimed at improving the performance of OPVs, with a particular focus on enhancing their visible-light external quantum efficiency (EQE) for improving the efficiency of Semi-transparent-OPVs. In this paper, the authors propose a novel approach to enhancing the visible-light EQE in ST-OPVs by controlling the interfacial dipoles through the use of SAMs. Specifically, the authors focus on the unique approach of applying bilateral SAM treatment to the zinc oxide (ZnO) electron transport layer (ETL) between the indium tin oxide (ITO) anode and the active layer of the OPV device. By controlling the dipole alignment between the ZnO and the adjacent layers, the authors can enhance the visible-light EQE of the device. As a result, the OPVs device using PM6:Y6:PCBM as the active layers and the double-SAMs exhibit a maximum power conversion efficiency (PCE) of 17.20% for small area device (0.125 cm2) and 13.88% for a large area (54 cm2) modules. Impressively, ST-OPVs led to significant device performance and transparency, with a PCE of 10.37% and average visible transmittance (AVT) of 36.27%.
This research was supported by the National Research Foundation of Korea (NRF-2021K1A4A7A03093853 & Grant NRF-2020M3H4A3081820).
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