Perovskite solar cells with doped Spiro-OMeTAD hole transport layers have shown the highest recorded power conversion efficiencies to date. However, its commercialization is still hindered by poor device stability due to the hygroscopic lithium bis(trifluoromethanesulfonyl)imide and volatile 4-tert-butylpyridine dopants as well as time-consuming oxidation in air.
Li Yaowen, Chen Weijie, Zhang Zhengbiao and others from Suzhou University reported a series of single-component iodine initiators with strong oxidizing properties and different electron delocalization properties, which can accurately control the oxidation state of Spiro-OMeTAD without air assistance, and clearly understand the oxidation state of Spiro-OMeTAD. oxidation mechanism. The iodine (III) in diphenyliodonium cation (IP+) can accept a single electron from Spiro-OMeTAD and form Spiro-OMeTAD•+ due to its strong oxidizing property.
Furthermore, due to the coordination of strongly delocalized TFSI- with Spiro-OMeTAD + in a stable radical complex, the resulting hole mobility is 30 times higher than that of pristine Spiro-OMeTAD. Furthermore, the IP-TFSI initiator promotes the growth of uniform and pinhole-free Spiro-OMeTAD films. Perovskite solar cells based on this oxidative hole transport layer showed an excellent efficiency of 25.16% (certified efficiency of 24.85% for an area of 0.062 cm2), and a module efficiency of 20.71% for an area of 15.03 cm2.
Yang, Heyi, Xu, Tingting, Chen, Weijie, Wu, Yeyong, Guo, Xianming, Shen, Yunxiu, Ding, Chengqiang, Chen, Xining, Chen, Haiyang, Ding, Junyuan, Wu, Xiaoxiao, Zeng, Guixiang, Zhang, Zhengbiao, Li, Yaowen, Li, Yongfang, Angew. Chem. Int. Ed. 2023, e202316183.
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