Dopant‐Free Hole‐Transporting Material with Enhanced Intermolecular Interaction for Efficient and Stable n‐i‐p Perovskite Solar Cells
Dopant‐Free Hole‐Transporting Material with Enhanced Intermolecular Interaction for Efficient and Stable n‐i‐p Perovskite Solar Cells
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DOI：
10.1002/aenm.202100967
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发表时间：
2021-06
影响因子：
27.8
通讯作者：
Jing Wang;Xin Wu;Yizhe Liu;Tian Qin;Kaicheng Zhang;Ning Li;Juan Zhao;Ruquan Ye;Zhanxi Fan;Zhenguo Chi;Zonglong Zhu
中科院分区：
文献类型：
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作者：
Jing Wang;Xin Wu;Yizhe Liu;Tian Qin;Kaicheng Zhang;Ning Li;Juan Zhao;Ruquan Ye;Zhanxi Fan;Zhenguo Chi;Zonglong Zhu
开发低成本、高效、稳定的钙钛矿太阳能电池无掺杂空穴传输材料(HTMS)是实现其商业化应用的关键。本文报道了一种新型的螺荧二硫杂环己烷小分子HTM的合成方法，即SFDT-TDM。The CH…相邻的SFDT-TDM中的π相互作用有利于提高空穴迁移率，并且SFDT-TDM中的甲硫基可以作为Lewis碱来钝化钙钛矿薄膜表面的缺陷，从而抑制了钙钛矿/HTM界面的非辐射复合，增强了电荷提取。其结果是，基于CsxFA1−xPbI3的PVSCs以固态光纤晶体管-时分复用器件为HTM，在小面积(0.04cm2)和大面积(1.0cm2)器件上分别实现了21.7%和20.3%的峰值功率转换效率(PCE)，光电流滞后可以忽略不计。此外，采用SFDT-TDM的全无机CsPbI3−xBrx PVSCs表现出令人印象深刻的17.1%的相变效率以及出色的稳定性。这项工作突出了螺荧核在探索用于PVSCs的低成本、无掺杂剂、高效和稳定的HTMS方面的巨大潜力。
Developing low‐cost, efficient, and stable dopant‐free hole‐transporting materials (HTMs) in perovskite solar cells (PVSCs) is essential to their commercial deployment. Herein, the synthesis of a novel spirofluorene‐dithiolane based small molecular HTM, SFDT‐TDM, through facile and low‐cost synthetic routes is reported. The CH…π interactions in adjacent SFDT‐TDM are beneficial for high hole mobility and the methylthio groups in SFDT‐TDM can serve as Lewis bases to passivate the defects on the surface of perovskite films, leading to suppressed non‐radiative recombination and enhanced charge extraction at the perovskite/HTM interface. As a result, CsxFA1−xPbI3 based PVSCs with SFDT‐TDM as the HTM realize champion power conversion efficiencies (PCEs) of 21.7% and 20.3% for small‐area (0.04 cm2) and large‐area (1.0 cm2) devices with negligible photocurrent hysteresis, respectively. Additionally, all‐inorganic CsPbI3−xBrx based PVSCs with SFDT‐TDM demonstrate an impressive PCE of 17.1% along with excellent stability. This work highlights the great potential of the spirofluorene core for exploring low‐cost and dopant‐free HTMs for PVSCs with high efficiency and stability.