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Design of NiOx/Carbon Heterostructure Interlayer to Improve Hole Extraction Efficiency of Inverted Perovskite Solar Cells
Advanced Materials Interfaces ( IF 5.4 ) Pub Date : 2021-09-13 , DOI: 10.1002/admi.202100862
Xin Yin 1 , Jifeng Zhai 1 , Providence Buregeya Ingabire 1 , Pingfan Du 1 , Wei‐Hsiang Chen 2 , Lixin Song 1 , Jie Xiong 1, 3 , Frank Ko 4
Affiliation  

An efficient hole transport layer (HTL) with desirable charge separation and hole extraction efficiency is crucial for inverted perovskite solar cells. However, the interfacial trap recombination loss and mismatched band alignment limit the actual performance of device, especially the open-circuit voltage (VOC). To address this issue, a unique NiOx/carbon heterostructure is designed as efficient anode interlayer for optimizing the interfacial charge transport dynamics between HTL and perovskite. Such a buffer interlayer can significantly contribute to the improved hole conductivity and hole extraction efficiency at HTL/perovskite interface. Moreover, the more favorable gradient energy level alignment can be formed to increase the interfacial electric field, inhibit the nonradiative recombination, and minimize the VOC loss. Therefore, the champion device achieves 19.51% efficiency with high VOC of 1.13 V, close to the highest power conversion efficiencies of MAPbI3 device. This work suggests that interface design can be an alternative approach to fabricate efficient inverted NiO-based devices.

中文翻译:

NiOx/碳异质结构中间层的设计提高倒钙钛矿太阳能电池的空穴提取效率

具有理想电荷分离和空穴提取效率的高效空穴传输层(HTL)对于倒置钙钛矿太阳能电池至关重要。然而,界面陷阱复合损失和不匹配的带对齐限制了器件的实际性能,尤其是开路电压(V OC)。为了解决这个问题,独特的 NiO x/碳异质结构被设计为有效的阳极夹层,用于优化 HTL 和钙钛矿之间的界面电荷传输动力学。这种缓冲夹层可以显着提高 HTL/钙钛矿界面处的空穴电导率和空穴提取效率。此外,可以形成更有利的梯度能级排列,以增加界面电场,抑制非辐射复合,并最大限度地减少V OC损失。因此,冠军器件在 1.13 V 的高V OC下实现了 19.51% 的效率,接近 MAPbI 3的最高功率转换效率设备。这项工作表明,界面设计可以成为制造高效倒置 NiO 基器件的替代方法。
更新日期:2021-10-08
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