To overcome obstacle of unbalanced hole and electron diffusion behavior in perovskites, a novel type of rationally designed bulk-heterojunction with C60-fullerene electron extraction material coupled with perovskite is for the first time reported. A facile strategy is developed for pyrrole to modify C60 to realize co-soluble of C60 and perovskites, achieving co-deposition of perovskite/pyrrole-fullerene bulk-heterojunction film via a one-step-spin-coating process. The unique perovskite/pyrrole-fullerene bulk-heterojunction exhibits increased mobility, quenched fluorescence intensity, decreased electron lifetime, large recombination resistance and reduced trap density of states, greatly enhancing charge extraction and transfer ability, thus boosting photoelectric conversion efficiency of solar cells. Introducing pyrrole-fullerene can effectively reduce grain boundaries and electron trap density to suppress electron-hole recombination. The enlarged interfacial area between pyrrole-fullerene and perovskite is essential for facilitating extraction of more free electrons from perovskite to fullerene electron acceptor, resulting in a balance of charge extraction and transport. A maximum power conversion efficiency of 18.9% with virtually no hysteresis for the bulk-heterojunction based perovskite solar cells with an optimized concentration of bulk-heterojunction can be obtained. The present strategy for high-performance bulk-heterojunction perovskite solar cells can be potential for industrial photovoltaic applications for its facile and low-cost process route.

为了克服钙钛矿中空穴和电子扩散行为不平衡的障碍，首次报道了一种新型的合理设计的体-异质结，C60-富勒烯电子萃取材料与钙钛矿结合。开发了一种简便的策略，使吡咯改性C60以实现C60和钙钛矿的共溶，通过一步旋涂工艺实现钙钛矿/吡咯-富勒烯本体-异质结膜的共沉积。独特的钙钛矿/吡咯-富勒烯本体-异质结显示出增加的迁移率，猝灭的荧光强度，降低的电子寿命，大的复合电阻和降低的态俘获密度，极大地增强了电荷的提取和转移能力，从而提高了太阳能电池的光电转换效率。引入吡咯-富勒烯可以有效地减小晶界和电子陷阱密度，从而抑制电子-空穴复合。吡咯-富勒烯与钙钛矿之间的界面增大对于促进从钙钛矿向富勒烯电子受体中提取更多的自由电子至关重要，从而实现了电荷提取和输运的平衡。对于具有最佳体积-异质结浓度的基于体积-异质结的钙钛矿太阳能电池，可以获得几乎没有滞后的18.9％的最大功率转换效率。高性能的整体异质结钙钛矿太阳能电池的当前策略因其便捷且低成本的工艺路线，在工业光伏应用中具有潜力。吡咯-富勒烯与钙钛矿之间的界面面积的扩大对于促进从钙钛矿到富勒烯电子受体的更多自由电子的提取至关重要，从而实现了电荷提取和输运的平衡。对于具有最佳体积-异质结浓度的基于体积-异质结的钙钛矿太阳能电池，可以获得几乎没有滞后的18.9％的最大功率转换效率。高性能的整体异质结钙钛矿太阳能电池的当前策略因其便捷且低成本的工艺路线，在工业光伏应用中具有潜力。吡咯-富勒烯与钙钛矿之间的界面增大对于促进从钙钛矿向富勒烯电子受体中提取更多的自由电子至关重要，从而实现了电荷提取和输运的平衡。对于具有最佳体积-异质结浓度的基于体积-异质结的钙钛矿太阳能电池，可以获得几乎没有滞后的18.9％的最大功率转换效率。高性能的整体异质结钙钛矿太阳能电池的当前策略因其便捷且低成本的工艺路线，在工业光伏应用中具有潜力。导致电荷提取和传输的平衡。对于具有最佳体积-异质结浓度的基于体积-异质结的钙钛矿太阳能电池，可以获得几乎没有滞后的18.9％的最大功率转换效率。高性能的整体异质结钙钛矿太阳能电池的当前策略因其便捷且低成本的工艺路线，在工业光伏应用中具有潜力。导致电荷提取和传输的平衡。对于具有最佳体积-异质结浓度的基于体积-异质结的钙钛矿太阳能电池，可以获得几乎没有滞后的18.9％的最大功率转换效率。高性能的整体异质结钙钛矿太阳能电池的当前策略因其便捷且低成本的工艺路线，在工业光伏应用中具有潜力。