使用草酸定制的空穴传输层用于高质量锡铅钙钛矿和高效全钙钛矿叠层电池。
Custom-tailored hole transport layer using oxalic acid for high-quality tin-lead perovskites and efficient all-perovskite tandems.
作者信息
Zhu Jingwei, Xu Yuliang, Luo Yi, Luo Jincheng, He Rui, Wang Changlei, Wang Yang, Wei Kun, Yi Zongjin, Gao Zhiyu, Wang Juncheng, You Jiayu, Zhang Zhihao, Lai Huagui, Ren Shengqiang, Liu Xirui, Xiao Chuanxiao, Chen Cong, Zhang Jinbao, Fu Fan, Zhao Dewei
机构信息
College of Materials Science and Engineering and Engineering Research Center of Alternative Energy Materials and Devices, Ministry of Education, Sichuan University, Chengdu 610065, China.
School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology, Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China.
出版信息
Sci Adv. 2024 Apr 19;10(16):eadl2063. doi: 10.1126/sciadv.adl2063.
All-perovskite tandem solar cells (TSCs) have exhibited higher efficiencies than single-junction perovskite solar cells (PSCs) but still suffer from the unsatisfactory performance of low-bandgap (LBG) tin-lead (Sn-Pb) subcells. The inherent properties of PEDOT:PSS are crucial to high-performance Sn-Pb perovskite films and devices; however, the underlying mechanism has not been fully explored and revealed. Here, we report a facile oxalic acid treatment of PEDOT:PSS (OA-PEDOT:PSS) to precisely regulate its work function and surface morphology. OA-PEDOT:PSS shows a larger work function and an ordered reorientation and fiber-shaped film morphology with efficient hole transport pathways, leading to the formation of more ideal hole-selective contact with Sn-Pb perovskite for suppressing interfacial nonradiative recombination losses. Moreover, OA-PEDOT:PSS induces (100) preferred orientation growth of perovskite for higher-quality Sn-Pb films. Last, the OA-PEDOT:PSS-tailored LBG PSC yields an impressive efficiency of up to 22.56% (certified 21.88%), enabling 27.81% efficient all-perovskite TSC with enhanced operational stability.
全钙钛矿串联太阳能电池（TSCs）已展现出比单结钙钛矿太阳能电池（PSCs）更高的效率，但仍受限于低带隙（LBG）锡铅（Sn-Pb）子电池不尽人意的性能。聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）的固有特性对高性能Sn-Pb钙钛矿薄膜和器件至关重要；然而，其潜在机制尚未得到充分探索和揭示。在此，我们报道了一种对PEDOT:PSS进行草酸处理的简便方法（OA-PEDOT:PSS），以精确调节其功函数和表面形貌。OA-PEDOT:PSS表现出更大的功函数、有序的重新取向以及具有高效空穴传输路径的纤维状薄膜形貌，从而导致与Sn-Pb钙钛矿形成更理想的空穴选择性接触，以抑制界面非辐射复合损失。此外，OA-PEDOT:PSS诱导钙钛矿的（100）择优取向生长，从而获得更高质量的Sn-Pb薄膜。最后，经OA-PEDOT:PSS定制的LBG PSC实现了高达22.56%（认证效率为21.88%）的令人印象深刻的效率，使全钙钛矿TSC的效率达到27.81%，并提高了运行稳定性。
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