Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Organic solar cells (OSCs) are becoming widely attractive in energy harvesting due to their advantageous characteristics such as low cost, tuneable absorption, adjustable energy levels, and large-area printable capability. The efficiency of organic solar cells is directly influenced by the interfacial layers employed as electron transport layers or hole transport layers (HTLs). PEDOT:PSS is one of the well-known HTLs in OSCs owing to its solution processability, effective electron blocking, and high work function that results in the formation of good Ohmic contact with a range of organic donor material. However, due to its acidic nature, PEDOT:PSS still possesses hygroscopic properties that might have an impact on the device’s performance and stability. Herein, a solution-processable method and annealing-free of the ultrathin phosphotungstic acid (TWA) was presented as hole transport layers. As the result, the power conversion efficiency (PCE) of 17.28% has been achieved with PM6:Y6:PCBM as the active layer, which was higher than the 15.88% with PEDOT:PSS. The increased performance of the TWA-based devices is mainly due to the contribution of lower parasitic absorption, increased carrier mobility, and reduced charge recombination, hence, can facilitate the efficient charge collection of photogenerated carriers in OSCs. This study provides a facile, low-cost method and the potential of TWA as HTL in OSCs which is favorable for improving the device performance and stability.
This research was supported by the National Research Foundation of Korea (NRF-2021K1A4A7A03093853 & Grant NRF-2020M3H4A3081820).
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