Dopant-Free Polymeric Hole Transport Material based Perovskite Solar Cells Achieving High Efficiency over 21%
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내용
HTMs play a crucial role in achieving high efficiency and stable PSCs. [1-2] At present, Spiro-OMeTAD is still the most widely used HTM in PSCs. However, the Spiro-OMeTAD shows low hole mobility, etc, which needs dopants, such as Li-TFSI and tBP, to improve charge transport performance. [3-4] However, the dopants are hygroscopic and accelerate the decomposition of the perovskite leading to poor stability. Therefore, the exploration of doped-free, high-efficiency HTM material has always been the direction of our efforts. Here, a new polymer electron-donor material, Nap-SiBTz3, is designed and synthesized as a dopant-free HTM. A champion power conversion efficiency of 21.02% was achieved, which was higher than that of dope-free Spiro-OMeTAD (12.42%). Besides, Nap-SiBTz3 showed high hydrophobic property (water contact angle ≈101°), which is beneficial to the long-term stability of the devices. These studies give useful guidance on exploiting efficient polymers as dopant-free HTMs in PSCs.