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Vitamin Natural Molecule Enabled Highly Efficient and Stable Planar n–p Homojunction Perovskite Solar Cells with Efficiency Exceeding 24.2%
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2022-11-23 , DOI: 10.1002/aenm.202203352
Bin Liu, Yuqi Wang, Yanjie Wu, Yuhong Zhang, Jiekai Lyu, Zhongqi Liu, Shuhang Bian, Xue Bai, Lin Xu, Donglei Zhou, Biao Dong, Hongwei Song

The defect passivation and interface energetics-modification between perovskite and transport layers are significant for the further improvement of efficiency and stability of perovskite solar cells (PSCs). Here, a double-layer modification engineering strategy is employed by different functionalized natural vitamins into the electron transport layer and perovskite, respectively. Considering the different role of each functional layer in PSCs, the vitamin C (VC) with high conductivity is introduced into SnO2, showing electron mobility enhancement, an interface energy-levels offsets reduction, and enhanced interfacial charge transfer. Meanwhile, antioxidant vitamin D2 (VD2) with multiple passivating functional groups is introduced into the perovskite bulk to moderately tailor its intrinsic characteristics. The surface energetics of perovskite are changed from n-type to p-type, the thickness of the p-type perovskite is 80 nm, thus the spontaneous n–p homojunction is formed in perovskite caused by VD2, which increases the built-in electric field and the efficiency of perovskite hole extraction. The synergistic effect of VC and VD2 better heightens the charge extraction efficiency and achieves charge-carrier transport balance in PSCs. The optimum device achieves a power conversion efficiency of 24.20% and a fill factor of 81.01% with negligible hysteresis. This efficiency is among the best PSCs employing natural molecules reported so far.

中文翻译:

维生素天然分子使高效稳定的平面n-p同质结钙钛矿太阳能电池效率超过24.2%

钙钛矿和传输层之间的缺陷钝化和界面能量学修饰对于进一步提高钙钛矿太阳能电池(PSC)的效率和稳定性具有重要意义。在这里,不同功能化的天然维生素分别采用双层改性工程策略进入电子传输层和钙钛矿。考虑到 PSC 中各功能层的不同作用,将具有高导电性的维生素 C (VC) 引入 SnO 2,显示电子迁移率增强,界面能级抵消减少,以及增强的界面电荷转移。同时,将具有多个钝化官能团的抗氧化剂维生素 D2 (VD2) 引入钙钛矿块体中,以适度调整其固有特性。钙钛矿的表面能量由n型变为p型,p型钙钛矿的厚度为80 nm,因此在钙钛矿中形成了由VD2引起的自发n-p同质结,增加了内建电领域和钙钛矿空穴提取的效率。VC 和 VD2 的协同作用更好地提高了电荷提取效率,并在 PSC 中实现了电荷-载流子传输平衡。优化后的器件实现了 24.20% 的功率转换效率和 81 的填充因子。01%,滞后可忽略不计。这种效率是迄今为止报道的采用天然分子的最佳 PSC 之一。
更新日期:2022-11-23
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