碳纳米管/聚三己基噻吩复合材料增强空穴提取助力碳基CsPbI_(2)Br太阳电池实现新的记录效率

Enhancing hole extraction via carbon nanotubes/poly(3-hexylthiophene)composite for carbon-based CsPbI_(2)Br solar cells with a new record efficiency

碳基钙钛矿太阳电池(C-PSCs)具有低成本和高稳定性的优势,这归因于碳电极的化学惰性和疏水性.然而,C-PSCs的光伏性能通常低于相应的金属电极器件,其中最重要的原因是钙钛矿层和碳电极之间低的空穴提取效率.这里,我们发展了一种基于碳纳米管/聚三己基噻吩(CNT/P3HT,CP)复合材料的空穴传输材料用于构建C-PSCs.P3HT和CNTs之间的强相互作用力增强了P3HT的结晶度,同时也改善了CNTs的分散性.相比于纯P3HT,CP复合材料中的CNT提供了空穴传输的高速通道,进而有效地降低电荷传输阻抗和改善空穴提取效率.这种CP复合材料被用于组装CsPbI_(2)Br C-PSCs,其光电压由1.233 V提高到1.355 V,能量转换效率也由13.29%提高到15.56%,刷新了碳基全无机钙钛矿太阳电池的记录.

Carbon-based perovskite solar cells(C-PSCs)benefit from the chemical inertness and hydrophobicity of carbon electrodes,resulting in high stability.Generally,C-PSCs have lower photovoltaic performance than metal electrode-based ones.This is primarily attributed to the low hole extraction efficiency at the interface between the perovskite and the carbon electrode.We synthesized a carbon nanotube/poly(3-hexylthiophene)(CNT/P3HT,denoted as CP)composite as a hole transport material to construct the state-of-the-art C-PSCs.The strongπ-πinteraction between P3HT and CNTs increases P3HT crystallinity and improves CNT dispersibility.Compared with pure P3HT,CNT in the CP composite provides a high-speed channel for hole transmission,lowering charge transmission impedance and improving hole extraction efficiency.This CP composite was used to assemble CsPbI_(2)Br C-PSCs,resulting in increases in open-circuit voltage from 1.233 to 1.355 V and power conversion efficiency from 13.29%to 15.56%,a new record for allinorganic perovskite C-PSCs.